Glass in building - Thermally toughened borosilicate safety glass - Part 1: Definition and description

This European Standard specifies tolerances, flatness, edgework, fragmentation and physical and mechanical characteristics of monolithic flat thermally toughened borosilicate safety glass for use in buildings.
Information on curved thermally toughened borosilicate safety glass is given in Annex A, but this product does not form part of this standard.
Other requirements, not specified in this standard, can apply to thermally toughened borosilicate safety glass which is incorporated into assemblies, e.g. laminated glass or insulating glass units, or undergo an additional treatment, e.g. coating. The additional requirements are specified in the appropriate product standard. Thermally toughened borosilicate safety glass, in this case, does not lose its mechanical or thermal characteristics.
This European Standard does not cover glass sandblasted after toughening.

Bauwesen - Thermisch vorgespanntes Borosilicat-Einscheibensicherheitsglas - Teil 1: Definition und Beschreibung

Diese Europäische Norm legt die Grenzabmaße, Geradheit, Kantenbearbeitung, das Bruchverhalten und
physikalische und mechanische Eigenschaften von einscheibigem, flachem, thermisch vorgespanntem
Borosilicat-Einscheibensicherheitsglas für die Verwendung im Bauwesen fest.
Gebogenes thermisch vorgespanntes Borosilicat-Einscheibensicherheitsglas ist zwar im Anhang A erwähnt,
aber nicht Bestandteil dieser Norm.
An thermisch vorgespannte Borosilicat-Einscheibensicherheitsgläser können andere Anforderungen, die in dieser
Norm nicht beschrieben sind, gestellt werden, wenn sie Bestandteil sind von Kombinationen wie z. B.
Verbundglas, Isolierglas oder wenn sie weiterverarbeitet werden, z. B. beschichtet. Die zusätzlichen
Anforderungen sind in den entsprechenden Normen der Fertigprodukte festgelegt. In diesem Fall wird thermisch
vorgespanntes Borosilicat-Einscheibensicherheitsglas seine mechanischen oder thermischen Eigenschaften nicht
verlieren.
Diese Europäische Norm behandelt kein im Anschluss an das Vorspannen sandgestrahltes Glas.

Verre dans la construction - Verre borosilicate de sécurité trempé thermiquement - Partie 1: Définition et description

La présente Norme européenne spécifie les tolérances, la planéité, la finition des chants, la fragmentation et
les caractéristiques physiques et mécaniques du verre plat monolithique borosilicate de sécurité, trempé
thermiquement, destiné à être utilisé dans la construction.
Des renseignements sont donnés dans l’Annexe A sur le verre borosilicate de sécurité bombé trempé
thermiquement mais ce produit ne fait pas partie de la présente norme.
D’autres exigences, non spécifiées dans la présente norme, sont susceptibles de s’appliquer au verre
borosilicate de sécurité trempé thermiquement intégré dans des ensembles, par exemple des ensembles en
verre feuilleté ou des vitrages isolants, ou de subir un traitement supplémentaire, par exemple un revêtement.
Les exigences supplémentaires sont spécifiées dans la norme de produit correspondante. Dans ce cas, le
verre borosilicate de sécurité trempé thermiquement ne perd pas ses caractéristiques mécaniques ou
thermiques.
La présente Norme européenne ne traite pas du verre sablé après trempe.

Steklo v gradbeništvu - Kaljeno borosilikatno varnostno steklo - 1. del: Definicija in opis

Ta evropski standard določa toleranco, ploskost, obdelavo robov, drobljenje ter fizične in mehanske lastnosti monolitnega ploskega kaljenega borosilikatnega varnostnega stekla, ki se uporablja v gradbeništvu. Informacije o ukrivljenem kaljenem borosilikatnem varnostnem steklu so podane v dodatku A, vendar ta izdelek ni del tega standarda. Druge zahteve, ki niso določene v tem standardu, se lahko uporabljajo za kaljeno borosilikatno varnostno steklo, ki je vgrajeno v sestave, npr. lepljeno steklo ali izolacijsko steklo, ali pa ga je treba dodatno obdelati, npr. z nanosi. Dodatne zahteve so določene v ustreznem standardu za izdelek. Kaljeno borosilikatno varnostno steklo v tem primeru ne izgubi mehanskih ali toplotnih lastnosti.

General Information

Status
Withdrawn
Publication Date
28-Feb-2012
Withdrawal Date
30-May-2012
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
30-Nov-2011
Due Date
30-Nov-2012
Completion Date
30-Nov-2011

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - Kaljeno borosilikatno varnostno steklo - 1. del: Definicija in opisGlas im Bauwesen - Thermisch vorgespanntes Borosilicat-Einscheiben-Sicherheitsglas - Teil 1: Definition und BeschreibungVerre dans la construction - Verre borosilicate de sécurité trempé thermiquement - Partie 1: Définition et descriptionGlass in building - Thermally toughened borosilicate safety glass - Part 1: Definition and description81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 13024-1:2011SIST EN 13024-1:2012en,fr,de01-marec-2012SIST EN 13024-1:2012SLOVENSKI

STANDARDSIST EN 13024-1:20041DGRPHãþD
SIST EN 13024-1:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13024-1
November 2011 ICS 81.040.20 Supersedes EN 13024-1:2002English Version

Glass in building - Thermally toughened borosilicate safety glass - Part 1: Definition and description

Verre dans la construction - Verre borosilicate de sécurité trempé thermiquement - Partie 1: Définition et description Glas im Bauwesen - Thermisch vorgespanntes Borosilicat-Einscheiben-Sicherheitsglas - Teil 1: Definition und Beschreibung This European Standard was approved by CEN on 25 September 2011.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13024-1:2011: ESIST EN 13024-1:2012

EN 13024-1:2011 (E) 2 Contents Page Foreword ..............................................................................................................................................................4Introduction .........................................................................................................................................................51 Scope ......................................................................................................................................................62 Normative references ............................................................................................................................63 Terms and definitions ...........................................................................................................................64 Glass products .......................................................................................................................................75 Fracture characteristics ........................................................................................................................86 Dimensions and tolerances ..................................................................................................................86.1 Nominal thickness and thickness tolerances .....................................................................................86.2 Width and length (sizes) .......................................................................................................................96.2.1 General ....................................................................................................................................................96.2.2 Maximum and minimum sizes ..............................................................................................................96.2.3 Tolerances and squareness .................................................................................................................96.2.4 Edge deformation produced by the vertical process ...................................................................... 106.3 Flatness ............................................................................................................................................... 106.3.1 General ................................................................................................................................................. 106.3.2 Measurement of overall bow ............................................................................................................. 136.3.3 Measurement of roller wave .............................................................................................................. 146.3.4 Measurement of edge lift (for horizontally toughened only) .......................................................... 156.3.5 Measurement of local distortion (for vertically toughened glass only) ........................................ 166.3.6 Limitation on overall bow, roller waves and edge lift for horizontally toughened glass ............ 176.3.7 Limitation on overall bow and local distortion for vertically toughened glass ............................ 176.3.8 Other distortions ................................................................................................................................. 177 Edge and/or surface work, holes, notches and cut-outs ................................................................ 187.1 Warning ................................................................................................................................................ 187.2 Edge working of glass for toughening ............................................................................................. 187.3 Profiled edges ..................................................................................................................................... 197.4 Round holes ........................................................................................................................................ 197.4.1 General ................................................................................................................................................. 197.4.2 Diameter of holes ................................................................................................................................ 197.4.3 Limitations on position of holes ....................................................................................................... 197.4.4 Tolerances on hole diameters ........................................................................................................... 207.4.5 Tolerances on position of holes ........................................................................................................ 217.5 Holes/others ........................................................................................................................................ 217.6 Notches and cut-outs ......................................................................................................................... 227.7 Shaped panes ...................................................................................................................................... 228 Fragmentation test.............................................................................................................................. 228.1 General ................................................................................................................................................. 228.2 Dimensions and number of test specimens .................................................................................... 228.3 Test procedure .................................................................................................................................... 228.4 Assessment of fragmentation ........................................................................................................... 238.5 Minimum values from the particle count .......................................................................................... 248.6 Selection of the longest particle ....................................................................................................... 258.7 Maximum length of longest particle ................................................................................................. 259 Other physical characteristics .......................................................................................................... 259.1 Optical distortion ................................................................................................................................ 259.1.1 Thermally toughened borosilicate safety glass produced by vertical toughening ..................... 259.1.2 Thermally toughened borosilicate safety glass produced by horizontal toughening ................. 25SIST EN 13024-1:2012

EN 13024-1:2011 (E) 3 9.2 Anisotropy (iridescence) .................................................................................................................... 259.3 Thermal durability ............................................................................................................................... 259.4 Mechanical strength ............................................................................................................................ 269.5 Classification of performance under accidental human impact..................................................... 2610 Marking ................................................................................................................................................. 26Annex A (informative)

Curved thermally toughened borosilicate safety glass .......................................... 27Annex B (informative)

Alternative method for the measurement of roller wave distortion ...................... 28B.1 Apparatus ............................................................................................................................................. 28B.2 Method .................................................................................................................................................. 28B.3 Limitations ........................................................................................................................................... 29B.4 Alternative use of apparatus .............................................................................................................. 29Annex C (informative)

Example of particle count .......................................................................................... 30Bibliography ...................................................................................................................................................... 33 SIST EN 13024-1:2012

EN 13024-1:2011 (E) 4 Foreword This document (EN 13024-1:2011) has been prepared by Technical Committee CEN/TC 129 “Glass in building”, the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2012, and conflicting national standards shall be withdrawn at the latest by May 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13024-1:2002. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. EN 13024 is divided into the following parts:  EN 13024-1, Glass in building — Thermally toughened borosilicate safety glass — Part 1: Definition and description;  EN 13024-2, Glass in building — Thermally toughened borosilicate safety glass — Part 2: Evaluation of conformity/Product standard. This European Standard differs from EN 13024-1:2002 as follows: a) some figures have been revised and new figures have been added; b) in Clause 3, new terms and definitions have been added; c) Subclause 6.2.3 "Tolerances and squareness" has been completely revised; the squareness of rectangular glass panes is now expressed by the difference between its diagonals and the limits of squareness are described by deviation between diagonals; d) Clauses 6 and 7 have been completely revised; e) normative Annex A "Determination of U value" has been deleted; f) a new informative Annex dealing with an alternative method for the measurement of roller wave distortion has been added. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 13024-1:2012

EN 13024-1:2011 (E) 5 Introduction Thermally toughened borosilicate safety glass has a higher thermal shock resistance and a safer breakage behaviour when compared with annealed glass. When it should be used to offer protection under accidental human impact, thermally toughened borosilicate safety glass also should be classified according to EN 12600. NOTE CEN/TC 129/WG 8 is producing standards for the determination of the design strength of glass and is preparing a design method.

SIST EN 13024-1:2012

EN 13024-1:2011 (E) 6 1 Scope This European Standard specifies tolerances, flatness, edgework, fragmentation and physical and mechanical characteristics of monolithic flat thermally toughened borosilicate safety glass for use in buildings. Information on curved thermally toughened borosilicate safety glass is given in Annex A, but this product does not form part of this standard. Other requirements, not specified in this standard, can apply to thermally toughened borosilicate safety glass which is incorporated into assemblies, e.g. laminated glass or insulating glass units, or undergo an additional treatment, e.g. coating. The additional requirements are specified in the appropriate product standard. Thermally toughened borosilicate safety glass, in this case, does not lose its mechanical or thermal characteristics. This European Standard does not cover glass sandblasted after toughening. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1096-1, Glass in building — Coated glass — Part 1: Definitions and classification EN 1288-3, Glass in building — Determination of the bending strength of glass — Part 3: Test with specimen supported at two points (four point bending) EN 1748-1-1, Glass in building — Special basic products —Borosilicate glasses — Part 1-1: Definitions and general physical and mechanical properties EN 12600, Glass in building — Pendulum tests — Impact test method and classification for flat glass 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 curved thermally toughened borosilicate safety glass thermally toughened borosilicate safety glass which has been deliberately given a specific profile during manufacture

NOTE The information is given in Annex A. 3.2 edge deformation deformation of the edge because of the tong marks 3.3 edge lift (also referred to as edge dip) distortion produced in horizontal toughened glass, at the leading and trailing edge of the plate NOTE This is a distortion produced by a reduction in surface flatness. SIST EN 13024-1:2012

EN 13024-1:2011 (E) 7 3.4 enamelled thermally toughened borosilicate safety glass thermally toughened borosilicate safety glass which has a ceramic frit fired into the surface during the toughening process NOTE 1 After toughening, the ceramic frit becomes an integral part of the glass. NOTE 2 In the UK, this glass is also known as opaque thermally toughened borosilicate safety glass. NOTE 3 The application of the ceramic frit may be by a continuous process or discontinuous application, e.g. screen printing. The enamelled surface could be partially or wholly covered. 3.5 flat thermally toughened borosilicate safety glass thermally toughened borosilicate safety glass which has not been deliberately given a specific profile during manufacture 3.6 thermally toughened borosilicate safety glass glass within which a permanent surface compressive stress, additionally to the basic mechanical strength, has been induced by a controlled heating and cooling process in order to give it greatly increased resistance to mechanical and thermal stress and prescribed fragmentation characteristics NOTE The mechanical properties, i.e. thermal durability and mechanical strength, and safety properties, i.e. fragmentation characteristics, are generated by the level of surface compression. These properties are not size dependent. 3.7 horizontal process process in which the glass is supported on horizontal rollers 3.8 local distortion local deformation of vertically toughened glass underneath the tong marks 3.9 overall bow deformation of the whole pane of horizontally and vertically toughened glass caused by the heating and cooling process 3.10 roller wave distortion distortion produced in horizontally toughened glass as a result of the glass during the toughening process being in contact with the rollers NOTE This is a surface distortion produced by a reduction in surface flatness. 3.11 vertical process process in which the glass is suspended by tongs 4 Glass products Thermally toughened borosilicate safety glass is made from a monolithic glass generally corresponding to one of the following standards:  borosilicate glass according to EN 1748-1-1;  coated glass according to EN 1096-1. SIST EN 13024-1:2012

EN 13024-1:2011 (E) 8 Glass of nominal thicknesses other than those covered in the above standards is possible. 5 Fracture characteristics The fracture characteristics of thermally toughened borosilicate safety glass are directly related to the amount of surface compression; these properties are not size dependent. When the thermally toughened borosilicate safety glass is manufactured with the correct degree of surface compression then in the event of breakage thermally toughened borosilicate safety glass fractures into numerous small pieces, the edges of which are generally blunt. NOTE 1 The degree of surface compression required is dependent upon glass type and thickness. NOTE 2 The fracture characteristics of glass are unaffected by temperatures between – 50 °C and + 100 °C.

The fragmentation described in Clause 8 is undertaken on unrestrained test specimens. The fragmentation in service may not always correspond to that determined during the fragmentation test due to the imposition of other stresses, i.e. from fixing or from reprocessing (e.g. laminating). 6 Dimensions and tolerances

6.1 Nominal thickness and thickness tolerances The nominal thicknesses and thickness tolerances are those given in the relevant product standard (see Clause 4), some of which are reproduced in Table 1. Table 1 — Nominal thicknesses and thickness tolerances Dimensions in millimetres Nominal Thickness tolerances for glass type thickness d Float Drawn sheet, rolled, cast 3 ± 0,2 - 0,4 / + 0,5 4 ± 0,2 - 0,4 / + 0,5 5 ± 0,2 - 0,4 / + 0,5 6 ± 0,2 - 0,4 / + 0,5 6,5 ± 0,2 - 0,4 / + 0,5 7,5 ± 0,3 - 0,4 / + 0,5 8 ± 0,3 - 0,4 / + 0,8 9 ± 0,3 - 0,9 / + 1,0 10 ± 0,3 - 0,9 / + 1,0 11 ± 0,3 - 0,9 / + 1,0 12 ± 0,3 - 0,9 / + 1,0 13 ± 0,5 - 0,9 / + 1,0 15 ± 0,5 - 0,9 / + 1,0

The thickness of a pane shall be determined as for the basic product. The measurement shall be taken at the centres of the 4 sides, and away from the area of any tong marks (see Figure 2), which may be present. SIST EN 13024-1:2012

EN 13024-1:2011 (E) 9 6.2 Width and length (sizes) 6.2.1 General When thermally toughened borosilicate safety glass dimensions are quoted for rectangular panes, the first dimension shall be the width, B, and the second dimension the length, H, as shown in Figure 1. It shall be made clear which dimension is the width, B, and which is the length, H, when related to its installed position.

Figure 1 — Examples of width, B, and length, H, relative to the pane shape 6.2.2 Maximum and minimum sizes For maximum and minimum sizes, the manufacturer should be consulted. 6.2.3 Tolerances and squareness The nominal dimensions for width and length being given, the finished pane shall not be larger than the nominal dimensions increased by the tolerance t, or smaller than the nominal dimensions reduced by the tolerance t. Limits are given in Table 2. The squareness of rectangular glass panes is expressed by the difference between its diagonals.

The difference between the two diagonal lengths of the pane of glass shall not be larger than the deviation limit v as specified in Table 3. The limits of squareness are described by deviation between diagonals. Limits are given in Table 3. Table 2 — Tolerances on width, B, and length, H Dimensions in millimetres Nominal dimension of side,

B or H Tolerance, t nominal glass thickness,

d ≤ 8 nominal glass thickness, d > 8 ≤ 2 000 ± 3,0 ± 4,0 2 000 < B or H ≤ 3 000 ± 4,0 ± 5,0 > 3 000 ± 5,0 ± 6,0 SIST EN 13024-1:2012

EN 13024-1:2011 (E) 10 Table 3 — Limit deviations for the difference between diagonals Dimensions in millimetres Limit deviation v on the difference between diagonals Nominal dimension B or H in mm nominal glass thickness, d ≤ 8 nominal glass thickness,

d > 8 ≤ 2 000 ≤ 4 ≤ 6 2 000 < B or H ≤ 3 000 ≤ 6 ≤ 8 > 3 000 ≤ 8 ≤ 10

6.2.4 Edge deformation produced by the vertical process The tongs used to suspend the glass during toughening result in surface depressions, known as tong marks (see Figure 2). The centres of the tong marks are situated up to a maximum of 20 mm in from the edge. A deformation of the edge less than 2 mm can be produced in the region of the tong mark and there may also be an area of optical distortion. These deformations are included in the tolerances in Table 2.

Key 1
deformation 2
up to 20 mm 3
tong mark 4

100 mm radius maximum area of optical distortion Figure 2 — Tong mark deformation 6.3 Flatness 6.3.1 General By the very nature of the toughening process, it is not possible to obtain a product as flat as annealed glass. This difference in flatness depends on the type of glass, e.g. coated etc., glass dimensions, i.e. the nominal thickness, the dimensions and the ratio between the dimensions, and the toughening process employed, i.e. vertical or horizontal. There are four kinds of distortion:  overall bow (see Figure 3);  roller wave distortion (for horizontally toughened glass only) (see Figure 4);  edge lift (for horizontally toughened glass only) (see Figure 5); SIST EN 13024-1:2012

EN 13024-1:2011 (E) 11 NOTE 1 Overall bow, roller wave and edge lift can, in general, be accommodated by the framing system.  local distortion (for vertically toughened glass only) (see Figure 6). NOTE 2 Local distortion needs to be allowed for within the glazing materials and the weather seals. For special requirements the manufacturers should be consulted.

Key 1 deformation for calculating overall bow 2 B, or H, or diagonal length 3 thermally toughened glass Figure 3 — Representation of overall bow SIST EN 13024-1:2012

EN 13024-1:2011 (E) 12

Key 1 thermally toughened glass Figure 4 — Representation of roller wave distortion

Key 1
straight edge 2
edge lift 3

thermally toughened glass Figure 5 — Representation of edge lift SIST EN 13024-1:2012

EN 13024-1:2011 (E) 13 Dimension in millimetres

Key 1 B, or H, the side on which the tong marks occur 2 local distortion 3 thermally toughened glass Figure 6 — Representation of local distortion 6.3.2 Measurement of overall bow The pane of glass shall be placed in a vertical position and supported on its longer side by two load bearing blocks at the quarter points (see Figure 7). The deformation shall be measured along the edges of the glass and along the diagonals, as the maximum distance between a straight metal ruler, or a stretched wire, and the concave surface of the glass (see Figure 3). The value for the bow is then expressed as the deformation, in millimetres, divided by the measured length of the edge of the glass, or diagonal, in metres, as appropriate. The measurement shall be carried out at room temperature. SIST EN 13024-1:2012

EN 13024-1:2011 (E) 14 Dimension in millimetres

Key 1 B or H 2 (B or H)/2 3 (B or H)/4 4 thermally toughened glass 5 support Figure 7 — Support conditions for the measurement of overall bow 6.3.3 Measurement of roller wave 6.3.3.1 General The roller wave is measured by means of a straight edge, or equivalent, being placed at right angles to the roller wave and bridging from peak to peak of the wave (see Figure 8). NOTE This section deals with measurement using a straight edge and feeler gauges. An alternative method is described in Annex B. 6.3.3.2 Apparatus A straight edge: — length of between 300 mm and 400 mm.

NOTE The actual length of straight edge required will depend upon the wavelength of the roller wave. Feeler gauges:

— various thicknesses in units of 0,05 mm. 6.3.3.3 Method Place the straight edge so that it bridges across adjacent peaks. Insert the feeler gauge between the glass surface and the straight edge. Increase the thickness of the feeler gauges until they just fill the gap between glass surface and the straight edge. Record the thickness of feeler gauge(s) to an accuracy of 0,05 mm.

SIST EN 13024-1:2012

EN 13024-1:2011 (E) 15 Repeat the measurement at several places over the glass surface. The measured roller wave distortion is the maximum value measured. The maximum values are given in Table 4. 6.3.3.4 Limitations The following limitations apply:  the roller wave can only be measured on panes with a dimension greater than 600 mm measured at right angles to the roller waves;  the roller wave cannot be measured in an exclusion area that is 150 mm from the edges of the pane. The apparatus should not be used in the area of these 150 mm;  panes with an overall bow shall be laid on a flat support. This will allow gravity to flatten out the overall bow and hence give a truer result for the roller wave. Dimension in millimetres

Key 1
straight edge 2
roller wave distortion 3

thermally toughened glass Figure 8 — Measurement of roller wave distortion 6.3.4 Measurement of edge lift (for horizontally toughened only) The glass shall be placed on a flat support with the edge lift overhanging the edge of the support by between 50 mm and 100 mm.

The straight edge is placed on the peaks of the roller waves and the gap between the ruler and the glass measured using a feeler gauge (see Figure 9).

The maximum values for edge lift are given in Table 5. The values in Table 5 only apply to thermally toughened glass having edgework complying with Figure 11 to Figure 14. For profiled edges or other types of edgework contact the manufacturer. SIST EN 13024-1:2012

EN 13024-1:2011 (E) 16 Dimension in millimetres

Key 1 straight edge 2 edge lift 3 thermally toughened glass 4 flat support Figure 9 — Measurement of edge lift 6.3.5 Measurement of local distortion (for vertically toughened glass only) Local distortion can occur over relatively short distances on the edge of the vertically toughened glass that contains the tong marks (see Figure 2).

Local distortion shall be measured over a limited length of 300 mm by using a straight ruler parallel to the edge at a distance of 25 mm from the edge of the glass (see Figure 10). Local distortion is expressed as millimetres/300 mm length. Dimension in millimetres

Key 1
straight edge 2
local distortion 3

thermally toughened glass Figure 10 — Measurement of local distortion SIST EN 13024-1:2012

EN 13024-1:2011 (E) 17 6.3.6 Limitation on overall bow, roller waves and edge lift for horizontally toughened glass The maximum allowable values for the overall bow, when measured according to 6.3.2, for roller waves, when measured according to 6.3.3 and edge lift, when measured according to 6.3.4 are given in Tables 4 and 5. This values only apply to thermally toughened glass without holes and/or notches and/or cut-outs. Table 4 — Maximum values of overall bow and roller wave distortion for horizontally toughened glass

Glass Type Maximum value for distortion Overall bow mm/m Roller Wave mm All a

5,0 0,5 Dependant upon the wave length of the roller wave an appropriate length of gauge has to be used. a For enamelled glass which is not covered over the whole surface the manufacturer should be consulted.

Table 5 — Maximum values for edge lift for horizontal toughening Dimensions in millimetres Type of glass Thickness of glass Maximum values All a all 1,0 Dependent upon the wave length of the roller wave an appropriate length of gauge has to be used.a For enamelled glass which i

...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - Toplotno kaljeno borosilikatno varnostno steklo - 1. del: Definicija in opisGlas im Bauwesen - Thermisch vorgespanntes Borosilicat-Einscheiben-Sicherheitsglas - Teil 1: Definition und BeschreibungVerre dans la construction - Verre borosilicate de sécurité trempé thermiquement - Partie 1: Définition et descriptionGlass in building - Thermally toughened borosilicate safety glass - Part 1: Definition and description81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:FprEN 13024-1kSIST FprEN 13024-1:2011en,fr,de01-maj-2011kSIST FprEN 13024-1:2011SLOVENSKI

STANDARD
kSIST FprEN 13024-1:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 13024-1
March 2011 ICS 81.040.20 Will supersede EN 13024-1:2002English Version

Glass in building - Thermally toughened borosilicate safety glass - Part 1: Definition and description

Verre dans la construction - Verre borosilicate de sécurité trempé thermiquement - Partie 1: Définition et description Glas im Bauwesen - Thermisch vorgespanntes Borosilicat-Einscheiben-Sicherheitsglas - Teil 1: Definition und Beschreibung This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 129.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN 13024-1:2011: EkSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 2 Contents Page Foreword ..............................................................................................................................................................4Introduction .........................................................................................................................................................51 Scope ......................................................................................................................................................62 Normative references ............................................................................................................................63 Terms and definitions ...........................................................................................................................64 Glass products .......................................................................................................................................75 Fracture characteristics ........................................................................................................................86 Dimensions and tolerances ..................................................................................................................86.1 Nominal thickness and thickness tolerances .....................................................................................86.2 Width and length (sizes) .......................................................................................................................96.2.1 General ....................................................................................................................................................96.2.2 Maximum and minimum sizes ..............................................................................................................96.2.3 Tolerances and squareness .................................................................................................................96.2.4 Edge deformation produced by the vertical process ...................................................................... 106.3 Flatness ............................................................................................................................................... 106.3.1 General ................................................................................................................................................. 106.3.2 Measurement of overall bow ............................................................................................................. 136.3.3 Measurement of roller wave .............................................................................................................. 146.3.4 Measurement of edge lift (for horizontal toughened only) ............................................................. 156.3.5 Measurement of local distortion (for vertical toughened glass only) ........................................... 166.3.6 Limitation on overall bow, roller waves and edge lift for horizontal toughened glass ............... 176.3.7 Limitation on overall bow and local distortion for vertical toughened glass ............................... 176.3.8 Other distortions ................................................................................................................................. 177 Edge and/or surface work, holes, notches and cut-outs ................................................................ 187.1 Warning ................................................................................................................................................ 187.2 Edge working of glass for toughening ............................................................................................. 187.3 Profiled edges ..................................................................................................................................... 197.4 Round holes ........................................................................................................................................ 197.4.1 General ................................................................................................................................................. 197.4.2 Diameter of holes ................................................................................................................................ 197.4.3 Limitations on position of holes ....................................................................................................... 197.4.4 Tolerances on hole diameters ........................................................................................................... 207.4.5 Tolerances on position of holes ........................................................................................................ 217.5 Holes/others ........................................................................................................................................ 227.6 Notches and cut-outs ......................................................................................................................... 227.7 Shaped panes ...................................................................................................................................... 228 Fragmentation test.............................................................................................................................. 228.1 General ................................................................................................................................................. 228.2 Dimensions and number of test specimens .................................................................................... 228.3 Test procedure .................................................................................................................................... 238.4 Assessment of fragmentation ........................................................................................................... 238.5 Minimum values from the particle count .......................................................................................... 248.6 Selection of the longest particle ....................................................................................................... 258.7 Maximum length of longest particle ................................................................................................. 259 Other physical characteristics .......................................................................................................... 259.1 Optical distortion ................................................................................................................................ 259.1.1 Thermally toughened borosilicate safety glass produced by vertical toughening ..................... 25kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 3 9.1.2 Thermally toughened borosilicate safety glass produced by horizontal toughening ................. 259.2 Anisotropy (iridescence) .................................................................................................................... 259.3 Thermal durability ............................................................................................................................... 269.4 Mechanical strength ............................................................................................................................ 269.5 Classification of performance under accidental human impact..................................................... 2610 Marking ................................................................................................................................................. 26Annex A (informative)

Curved thermally toughened borosilicate safety glass .......................................... 27Annex B (informative)

Alternative method for the measurement of roller wave distortion ...................... 28B.1 Apparatus ............................................................................................................................................. 28B.2 Method .................................................................................................................................................. 28B.3 Limitations ........................................................................................................................................... 29B.4 Alternative use of apparatus .............................................................................................................. 29Annex C (informative)

Example of particle count .......................................................................................... 30Bibliography ...................................................................................................................................................... 33 kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 4 Foreword This document (FprEN 13024-1:2011) has been prepared by Technical Committee CEN/TC 129 “Glass in building”, the secretariat of which is held by NBN. This document is currently submitted to the Unique Acceptance Procedure. This document will supersede EN 13024-1:2002. kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 5 Introduction Thermally toughened borosilicate safety glass has a higher thermal shock resistance and a safer breakage behaviour when compared with annealed glass. When it should be used to offer protection under accidental human impact, thermally toughened borosilicate safety glass also should be classified according to EN 12600. NOTE CEN/TC129/WG8 is producing standards for the determination of the design strength of glass and is preparing a design method.

This part of the document does not stand alone, it is a part of one document:  EN 13024-1,,Glass in building — Thermally toughened borosilicate safety glass — Part 1: Definition and description;  EN 13024-2, Glass in building — Thermally toughened borosilicate safety glass — Part 2: Evaluation of conformity. kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 6 1 Scope This European Standard specifies tolerances, flatness, edgework, fragmentation and physical and mechanical characteristics of monolithic flat thermally toughened borosilicate safety glass for use in buildings. Information on curved thermally toughened borosilicate safety glass is given in Annex A, but this product does not form part of this standard. Other requirements, not specified in this standard, can apply to thermally toughened borosilicate safety glass which is incorporated into assemblies, e.g. laminated glass or insulating glass units, or undergo an additional treatment, e.g. coating. The additional requirements are specified in the appropriate product standard. Thermally toughened borosilicate safety glass, in this case, does not lose its mechanical or thermal characteristics. This standard does not cover glass sandblasted after toughening. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1096-1, Glass in building — Coated glass — Part 1: Definitions and classification EN 1288-3, Glass in building — Determination of the bending strength of glass — Part 3: Test with specimen supported at two points (four point bending) EN 1748-1-1, Glass in building — Special basic products — Borosilicate glasses — Part 1-1: Definitions and general physical and mechanical properties EN 12600, Glass in building — Pendulum tests — Impact test method and classification for flat glass 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 curved thermally toughened borosilicate safety glass thermally toughened borosilicate safety glass which has been deliberately given a specific profile during manufacture (see Annex A) 3.2 edge deformation deformation of the edge because of the tong marks 3.3 edge lift (also referred to as edge dip) distortion produced in horizontal toughened glass, at the leading and trailing edge of the plate. This is a distortion produced by a reduction in surface flatness 3.4 enamelled thermally toughened borosilicate safety glass thermally toughened borosilicate safety glass which has a ceramic frit fired into the surface during the toughening process. After toughening, the ceramic frit becomes an integral part of the glass kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 7 NOTE 1 In the UK, this glass is also known as opaque thermally toughened borosilicate safety glass. NOTE 2 The application of the ceramic frit may be by a continuous process or discontinuous application, e.g. screen printing. The enamelled surface could be partially or wholly. 3.5 flat thermally toughened borosilicate safety glass thermally toughened borosilicate safety glass which has not been deliberately given a specific profile during manufacture 3.6 thermally toughened borosilicate safety glass glass within which a permanent surface compressive stress, additionally to the basic mechanical strength, has been induced by a controlled heating and cooling process in order to give it greatly increased resistance to mechanical and thermal stress and prescribed fragmentation characteristics NOTE The mechanical properties, i.e. thermal durability and mechanical strength, and safety properties, i.e. fragmentation characteristics, are generated by the level of surface compression. These properties are not size dependent. 3.7 horizontal process process in which the glass is supported on horizontal rollers 3.8 local distortion local deformation of vertically toughened glass underneath the tong marks 3.9 overall bow deformation of the whole pane of horizontally and vertically toughened glass caused by the heating and cooling process 3.10 roller wave distortion distortion produced in horizontally toughened glass as a result of the glass during the toughening process being in contact with the rollers. This is a surface distortion produced by a reduction in surface flatness 3.11 vertical process process in which the glass is suspended by tongs 4 Glass products Thermally toughened borosilicate safety glass is made from a monolithic glass generally corresponding to one of the following standards:  borosilicate glass according to EN 1748-1-1;  coated glass according to EN 1096-1. Glass of nominal thicknesses other than those covered in the above standards is possible. kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 8 5 Fracture characteristics The fracture characteristics of thermally toughened borosilicate safety glass are directly related to the amount of surface compression, these properties are not size dependent. When the thermally toughened borosilicate safety glass is manufactured with the correct degree of surface compression then in the event of breakage thermally toughened borosilicate safety glass fractures into numerous small pieces, the edges of which are generally blunt. NOTE 1 The degree of surface compression required is dependent upon glass type and thickness. NOTE 2 The fracture characteristics of glass are unaffected by temperatures between – 50 °C and + 100 °C.

The fragmentation described in Clause 8 is undertaken on unrestrained test specimens. The fragmentation in service may not always correspond to that determined during the fragmentation test due to the imposition of other stresses, i.e. from fixing or from reprocessing (e.g. laminating). 6 Dimensions and tolerances

6.1 Nominal thickness and thickness tolerances The nominal thicknesses and thickness tolerances are those given in the relevant product standard (see Clause 4), some of which are reproduced in Table 1. Table 1 — Nominal thicknesses and thickness tolerances Dimensions in millimetres Nominal Thickness tolerances for glass type thickness d Float Drawn sheet, rolled, cast 3 ± 0,2 - 0,4 / + 0,5 4 ± 0,2 - 0,4 / + 0,5 5 ± 0,2 - 0,4 / + 0,5 6 ± 0,2 - 0,4 / + 0,5 6,5 ± 0,2 - 0,4 / + 0,5 7,5 ± 0,3 - 0,4 / + 0,5 8 ± 0,3 - 0,4 / + 0,8 9 ± 0,3 - 0,9 / + 1,0 10 ± 0,3 - 0,9 / + 1,0 11 ± 0,3 - 0,9 / + 1,0 12 ± 0,3 - 0,9 / + 1,0 13 ± 0,5 - 0,9 / + 1,0 15 ± 0,5 - 0,9 / + 1,0

The thickness of a pane shall be determined as for the basic product. The measurement shall be taken at the centres of the 4 sides, and away from the area of any tong marks (see Figure 2), which may be present. kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 9 6.2 Width and length (sizes) 6.2.1 General When thermally toughened borosilicate safety glass dimensions are quoted for rectangular panes, the first dimension shall be the width, B, and the second dimension the length, H, as shown in Figure 1. It shall be made clear which dimension is the width, B, and which is the length, H, when related to its installed position.

Figure 1 — Examples of width, B, and length, H, relative to the pane shape 6.2.2 Maximum and minimum sizes For maximum and minimum sizes, the manufacturer should be consulted. 6.2.3 Tolerances and squareness The nominal dimensions for width and length being given, the finished pane shall not be larger than the nominal dimensions increased by the tolerance t, or smaller than the nominal dimensions reduced by the tolerance t. Limits are given in Table 2. The squareness of rectangular glass panes is expressed by the difference between its diagonals.

The difference between the two diagonal lengths of the pane of glass shall not be larger than the deviation limit v as specified in Table 3. The limits of squareness are described by deviation between diagonals. Limits are given in Table 3. Table 2 — Tolerances on width, B, and length, H Dimensions in millimetres Nominal dimension of side,

B or H Tolerance, t nominal glass thickness,

d ≤ 8 nominal glass thickness, d > 8 ≤ 2000 ± 3,0 ± 4,0 2000 < B or H ≤ 3000 ± 4,0 ± 5,0 > 3000 ± 5,0 ± 6,0

kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 10 Table 3 — Limit deviations for the difference between diagonals Dimensions in millimetres Limit deviation v on the difference between diagonals Nominal dimension B or H in mm nominal glass thickness, d ≤ 8 nominal glass thickness,

d > 8 ≤ 2000 ≤ 4 ≤ 6 2000 < B or H ≤ 3000 ≤ 6 ≤ 8 > 3000 ≤ 8 ≤ 10

6.2.4 Edge deformation produced by the vertical process The tongs used to suspend the glass during toughening result in surface depressions, known as tong marks (see Figure 2). The centres of the tong marks are situated up to a maximum of 20 mm in from the edge. A deformation of the edge less than 2 mm can be produced in the region of the tong mark and there may also be an area of optical distortion. These deformations are included in the tolerances in Table 2.

Key 1
deformation 2
up to 20 mm 3
tong mark 4

100 mm radius maximum area of optical distortion Figure 2 — Tong mark deformation 6.3 Flatness 6.3.1 General By the very nature of the toughening process, it is not possible to obtain a product as flat as annealed glass. This difference in flatness depends on the type of glass, e.g. coated etc., glass dimensions, i.e. the nominal thickness, the dimensions and the ratio between the dimensions, and the toughening process employed, i.e. vertical or horizontal. There are four kinds of distortion:  overall bow (see Figure 3);  roller wave distortion (for horizontal toughened glass only) (see Figure 4); kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 11  edge lift (for horizontal toughened glass only) (see Figure 5); NOTE 1 Overall bow, roller wave and edge lift can, in general, be accommodated by the framing system.  local distortion (for vertical toughened glass only) (see Figure 6). NOTE 2 Local distortion needs to be allowed for within the glazing materials and the weather seals. For special requirements the manufacturers should be consulted.

Key 1 deformation for calculating overall bow 2 B, or H, or diagonal length 3 thermally toughened glass Figure 3 — Representation of overall bow

kSIST FprEN 13024-1:2011
FprEN 13024-1:2011 (E) 12
Figure 4 — Representation of roller wave distortion Key
1 thermally toughened glass
Key 1
straight edge 2
edge lift 3

thermally toughened glass Figure 5 — Representation of edge lift kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 13

Key 1 B, or H, the side on which the tong marks occur 2 local distortion 3 thermally toughened glass Figure 6 — Representation of local distortion 6.3.2 Measurement of overall bow The pane of glass shall be placed in a vertical position and supported on its longer side by two load bearing blocks at the quarter points (see Figure 7). The deformation shall be measured along the edges of the glass and along the diagonals, as the maximum distance between a straight metal ruler, or a stretched wire, and the concave surface of the glass (see Figure 3). The value for the bow is then expressed as the deformation, in millimetres, divided by the measured length of the edge of the glass, or diagonal, in millimetres, as appropriate. The measurement shall be carried out at room temperature. kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 14

Key 1 B or H 2 (B or H)/2 3 (B or H)/4 4 thermally toughened glass 5 support Figure 7 — Support conditions for the measurement of overall bow 6.3.3 Measurement of roller wave 6.3.3.1 General The roller wave is measured by means of a straight edge, or equivalent, being placed at right angles to the roller wave and bridging from peak to peak of the wave (see Figure 8). NOTE This section deals with measurement using a straight edge and feeler gauges. An alternative method is described in Annex B. 6.3.3.2 Apparatus A straight edge: — length of between 300 mm and 400 mm.

NOTE The actual length of straight edge required will depend upon the wavelength of the roller wave. Feeler gauges:

— various thicknesses in units of 0,05 mm. 6.3.3.3 Method Place the straight edge so that it bridges across adjacent peaks. Insert the feeler gauge between the glass surface and the straight edge. Increase the thickness of the feeler gauges until they just fill the gap between glass surface and the straight edge. Record the thickness of feeler gauge(s) to an accuracy of 0,05 mm.

kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 15 Repeat the measurement at several places over the glass surface. The measured roller wave distortion is the maximum value measured. The maximum values are given in Table 4. 6.3.3.4 Limitations The following limitations apply:  the roller wave can only be measured on panes with a dimension greater than 600 mm measured at right angles to the roller waves;  the roller wave cannot be measured in an exclusion area that is 150 mm from the edges of the pane. The apparatus should not be used in the area of these 150 mm;  panes with an overall bow shall be laid on a flat support. This will allow gravity to flatten out the overall bow and hence give a truer result for the roller wave.

Key 1
straight edge 2
roller wave distortion 3

thermally toughened glass Figure 8 — Measurement of roller wave distortion 6.3.4 Measurement of edge lift (for horizontal toughened only) The glass shall be placed on a flat support with the edge lift overhanging the edge of the support by between 50 mm and 100 mm.

The straight edge is placed on the peaks of the roller waves and the gap between the ruler and the glass measured using a feeler gauge (see Figure 9).

The maximum values for edge lift are given in Table 5. The values in Table 5 only apply to thermally toughened glass having edgework complying with Figure 11 to Figure 14. For profiled edges or other types of edgework contact the manufacturer. kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 16

Key 1 straight edge 2 edge lift 3 thermally toughened glass 4 flat support Figure 9 — Measurement of edge lift 6.3.5 Measurement of local distortion (for vertical toughened glass only) Local distortion can occur over relatively short distances on the edge of the vertical toughened glass that contains the tong marks (see Figure 2).

Local distortion shall be measured over a limited length of 300 mm by using a straight ruler parallel to the edge at a distance of 25 mm from the edge of the glass (see Figure 10). Local distortion is expressed as millimetres/300 mm length.

Key 1
straight edge 2
local distortion 3

thermally toughened glass Figure 10 — Measurement of local distortion kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 17 6.3.6 Limitation on overall bow, roller waves and edge lift for horizontal toughened glass The maximum allowable values for the overall bow, when measured according to 6.3.2, for roller waves, when measured according to 6.3.3 and edge lift, when measured according to 6.3.4 are given in Tables 4 and 5. This values only apply to thermally toughened glass without holes and/or notches and/or cut-outs. Table 4 — Maximum values of overall bow and roller wave distortion for horizontal toughened glass

Glass Type Maximum value for distortion Overall bow mm/m Roller Wave mm All a

5,0 0,5 a For enamelled glass which is not covered over the whole surface the manufacturer should be consulted. NOTE Dependant upon the wave length of the roller wave an appropriate length of gauge has to be used

Table 5 — Maximum values for edge lift for horizontal toughening Dimensions in millimetres Type of glass Thickness of glass Maximum values All a all 1,0 a For enamelled glass which is not covered over the whole surface the manufacturer should be consulted. NOTE Dependent upon the wave length of the roller wave an appropriate length of gauge has to be used 6.3.7 Limitation on overall bow and local distortion for vertical toughened glass The maximum allowable values for the overall bow, when measured according to 6.3.2, and the local distortion, when measured according to 6.3.5, are given in Table 6. These values only apply to toughened glass without holes and/or notches and/or cut-outs. Table 6 — Maximum values of overall bow and local distortion for vertical toughened glass

Glass Type Maximum value for distortion Overall bow mm / m Local distortion mm / 300 mm All a 5,0 1,0 a For enamelled glass which is not covered over the whole surface the manufacturer should be consulted.

6.3.8 Other distortions The incorporation of holes and/or notches in a plate gives the possibility of distortions being produced during the toughening process as a result of the absence of glass and/or an increase in unsupported edges. The magnitude of these distortions will generally be less than edge lift in horizontally toughened glass or local distortion in vertically toughened glass. kSIST FprEN 13024-1:2011

FprEN 13024-1:2011 (E) 18 7 Edge and/or surface work, holes, notches and cut-outs 7.1 Warning Thermally toughened borosilicate safety glass should not be cut, sawed, drilled, edge worked or surface finished (e.g. sandblasting, acid etching) aft

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