SIST EN 14179-1:2016
(Main)Glass in building - Heat soaked thermally toughened soda lime silicate safety glass - Part 1: Definition and description
Glass in building - Heat soaked thermally toughened soda lime silicate safety glass - Part 1: Definition and description
This European Standard specifies the heat soak process system together with tolerances flatness, edgework, fragmentation and physical and mechanical characteristics of monolithic flat heat soaked thermally toughened soda lime silicate safety glass for use in buildings.
Information on curved heat soaked thermally toughened soda lime silicate safety glass is given in Annex B, but this product does not form part of this European Standard.
Other requirements, not specified in this European Standard, can apply to heat soaked thermally toughened soda lime silicate safety glass which is incorporated into assemblies, e.g. laminated glass or insulating units, or undergo an additional treatment, e.g. coating. The additional requirements are specified in the appropriate product standard. Heat soaked thermally toughened soda lime silicate safety glass, in this case, does not lose its mechanical or thermal characteristics.
Surface finished glasses (e.g. sandblasted, acid etched) after toughening are not covered by this European Standard.
Glas im Bauwesen - Heißgelagertes thermisch vorgespanntes Kalknatron-Einscheibensicherheitsglas - Teil 1: Definition und Beschreibung
Diese Europäische Norm legt das Heißlagerungsprozess-System sowie die Grenzabweichungen, Geradheit, Kantenbearbeitung, das Bruchverhalten und physikalische und mechanische Eigenschaften von flachem, heißgelagertem thermisch vorgespanntem Kalknatron-Einscheibensicherheitsglas für die Verwendung in Gebäuden fest.
Gebogenes heißgelagertes thermisch vorgespanntes Kalknatron-Einscheibensicherheitsglas ist nicht Bestandteil dieser Europäischen Norm.
An heißgelagerte thermisch vorgespannte Kalknatron-Einscheibensicherheitsgläser können andere Anforderungen, die in dieser Europäischen Norm nicht beschrieben sind, gestellt werden, wenn sie Bestandteil von Kombinationen sind, wie z. B. Verbundglas oder Isolierglas, oder wenn sie weiterverarbeitet, z. B. beschichtet werden. Die zusätzlichen Anforderungen sind in den entsprechenden Produktnormen festgelegt. In diesem Fall verliert heißgelagertes thermisch vorgespanntes Kalknatron-Einscheibensicherheitsglas seine Biegefestigkeit oder seinen Widerstand gegen Temperaturdifferenzen nicht.
Glas, dessen Oberfläche nach dem thermischen Vorspannen bearbeitet (z. B. sandgestrahlt oder säuregeätzt) wurde, ist nicht Gegenstand dieser Europäischen Norm.
Verre dans la construction - Verre de silicate sodo-calcique de sécurité trempé et traité Heat Soak - Partie 1: Définition et description
La présente Norme européenne spécifie le système fonctionnel de stabilisation thermique ainsi que les tolérances, la planéité, la finition des chants, la fragmentation et les caractéristiques physiques et mécaniques du verre plat monolithique de silicate sodo-calcique de sécurité trempé thermiquement et traité Heat Soak pour la construction.
Le verre bombé de silicate sodo-calcique de sécurité trempé thermiquement et traité Heat Soak ne fait pas partie de la présente Norme européenne.
D'autres exigences, non spécifiées dans la présente Norme européenne, peuvent s'appliquer au verre de silicate sodo-calcique de sécurité trempé thermiquement et traité Heat Soak intégré par transformation, par exemple du verre feuilleté ou des vitrages isolants préfabriqués scellés ou qui subit un traitement supplémentaire, par exemple une couche. Les exigences additionnelles sont spécifiées dans la norme de produit correspondante. Dans ce cas, le verre de silicate sodo-calcique de sécurité trempé thermiquement et traité Heat Soak ne perd pas ses caractéristiques de résistance à la flexion et sa résistance aux écarts de température.
Les verres traités en surface (par exemple, dépolis, gravés à l'acide) après la trempe ne relèvent pas du domaine d'application de la présente Norme européenne.
Steklo v gradbeništvu - HS-preskus kaljenega natrij-kalcijevega silikatnega varnostnega stekla - 1. del: Definicije in opis
Ta evropski standard določa sistem procesa toplotne obdelave (HS) s toleranco, ploskostjo, obdelavo robov, drobljenjem ter fizičnimi in mehanskimi lastnostmi monolitnega ploskega HS-preskušenega kaljenega zemljoalkalijskega silikatnega varnostnega stekla, ki se uporablja v gradbeništvu. Informacije o ukrivljenem HS-preskušenem kaljenem natrij-kalcijevem silikatnem varnostnem steklu so navedene v dodatku B, vendar ta proizvod ni del tega evropskega standarda. Druge zahteve, ki niso določene v tem evropskem standardu, je mogoče uporabiti za HS-preskušeno kaljeno natrij-kalcijevo silikatno 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 proizvod. HS-preskušeno kaljeno natrij-kalcijevo silikatno varnostno steklo v tem primeru ne izgubi mehanskih ali toplotnih lastnosti. Steklo, ki je po kaljenju površinsko obdelano (npr. peskano, kislinsko jedkano), ne spada na področje uporabe tega evropskega standarda.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - HS-preskus kaljenega natrij-kalcijevega silikatnega varnostnega stekla - 1. del: Definicije in opisGlas im Bauwesen - Heißgelagertes thermisch vorgespanntes Kalknatron-Einscheibensicherheitsglas - Teil 1: Definition und BeschreibungVerre dans la construction - Verre de silicate sodo-calcique de sécurité trempé et traité Heat Soak - Partie 1: Définition et descriptionGlass in building - Heat soaked thermally toughened soda lime silicate safety glass - Part 1: Definition and description81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 14179-1:2016SIST EN 14179-1:2016en,fr,de01-oktober-2016SIST EN 14179-1:2016SLOVENSKI
STANDARDSIST EN 14179-1:20051DGRPHãþD
SIST EN 14179-1:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14179-1
July
t r s x ICS
z sä r v rä t r Supersedes EN
s v s y {æ sã t r r wEnglish Version
Glass in building æ Heat soaked thermally toughened soda lime silicate safety glass æ Part
sã Definition and description Verre dans la construction æ Verre de silicate sodoæcalcique de sßcuritß trempß et traitß Heat Soak æ Partie
sã Dßfinition et description
Glas im Bauwesen æ Heißgelagertes thermisch vorgespanntes KalknatronæEinscheibensicherheitsglas æ Teil
sã Definition und Beschreibung This European Standard was approved by CEN on
s t May
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s v s y {æ sã t r s x ESIST EN 14179-1:2016
EN 14179-1:2016 (E) 2 Contents Page
European foreword . 4 Introduction . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Glass products . 8 5 Manufacturing processes . 8 5.1 General . 8 5.2 Toughening process . 9 5.3 Heat soak process cycle . 9 6 Heat soak process system . 10 6.1 General . 10 6.2 Oven . 10 6.3 Glass support . 10 6.4 Glass separation . 10 6.5 Calibration . 11 7 Fracture characteristics . 12 8 Dimensions and tolerances . 12 8.1 Nominal thickness and thickness tolerances . 12 8.2 Width and length (sizes) . 13 8.3 Flatness . 15 9 Edge and / or surface work, holes, notches and cut-outs . 23 9.1 Warning . 23 9.2 Edge working of glass for toughening . 23 9.3 Profiled edges . 24 9.4 Round holes . 24 9.5 Holes / others . 27 9.6 Notches and cut-outs . 27 9.7 Shaped panes . 27 10 Fragmentation test . 27 10.1 General . 27 10.2 Dimensions and number of test specimens . 27 10.3 Test procedure . 27 10.4 Assessment of fragmentation . 28 10.5 Minimum values from the particle count . 29 10.6 Selection of the longest particle . 30 10.7 Maximum length of longest particle . 30 11 Other physical characteristics . 30 11.1 Optical distortion . 30 11.2 Anisotropy (iridescence) . 30 11.3 Thermal durability . 30 SIST EN 14179-1:2016
EN 14179-1:2016 (E) 3 11.4 Mechanical strength . 31 11.5 Classification of performance under accidental human impact . 31 12 Marking . 31 Annex A (normative)
Heat soak process system calibration test . 32 A.1 Calibration criteria. 32 A.2 Loading of oven and position for glass surface temperature measurement . 32 A.3 Procedure . 33 A.4 Records . 33 A.5 Interpretation of the calibration test . 34 Annex B (informative)
Alternative method for the measurement of roller wave distortion . 39 B.1 Apparatus . 39 B.2 Method . 39 B.3 Limitations . 40 B.4 Alternative use of apparatus . 40 Annex C (informative)
Examples of particle count . 41 Bibliography . 43
SIST EN 14179-1:2016
EN 14179-1:2016 (E) 4 European foreword This document (EN 14179-1:2016) 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 January 2017, and conflicting national standards shall be withdrawn at the latest by January 2017. This document supersedes EN 14179-1:2005. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. EN 14179, Glass in building — Heat soaked thermally toughened soda lime silicate safety glass, is composed of the following parts: — Part 1: Definition and description; — Part 2: Evaluation of conformity / Product standard. This European Standard differs from EN 14179-1:2005 as follows: a) some figures have been revised and some new figures have been added; b) new terms and definitions have been included in Clause 3, e.g. air cushion process (3.7), edge lift (3.10) and roller wave distortion (3.14) further nominal thicknesses have been included in Table 1; c) the glass temperature during the holding time of the heat soak process cycle has been reduced, d) subclause 8.2.3 “Tolerances and squareness” has been completely revised; the squareness of rectangular glass panes is now expressed by the difference between its diagonals; e) Clauses 8 and 9 have been completely revised (including the air cushion manufacturing process); f) the informative Annex “Curved heat soaked thermally toughened soda lime silicate safety glass” has been deleted; g) 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 organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14179-1:2016
EN 14179-1:2016 (E) 5 Introduction Heat soaked thermally toughened soda lime silicate safety glass has a safer breakage behaviour when compared with annealed glass. It also has a known level of residual risk of spontaneous breakage arising from the possible presence of critical nickel sulphide (NiS) inclusions in the heat soaked thermally toughened soda lime silicate glass. NOTE 1 This case deals with extremely large quantities of glass. These quantities are dealt with on a statistical basis. Therefore, it is impossible to select a quantity of heat soaked thermally toughened soda lime silicate safety glass, for a building, and claim that ‘no break’ by NiS inclusion can occur. The breakage of heat soaked thermally toughened soda lime silicate safety glass caused by other influences is not considered in this European Standard. When used to offer protection under accidental human impact, heat soaked thermally toughened soda lime silicate safety glass also should be classified according to EN 12600. NOTE 2 CEN/TC 129/WG 8 is producing standards for the determination of the design strength of glass and is preparing a design method. The European Committee for Standardization (CEN) draws attention to the fact that it is claimed that compliance with this document may involve the use of a patent concerning heat soak tests. CEN takes no position concerning the evidence, validity and scope of this patent right. The holder of this patent right has ensured CEN that he / she is willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with CEN. Information may be obtained from: SAINT-GOBAIN GLASS FRANCE; Les Miroirs – 92096 La Défense Cedex, Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. CEN shall not be held responsible for identifying any or all such patent rights. CEN and CENELEC maintain online lists of patents relevant to their standards. Users are encouraged to consult the lists for the most up to date information concerning patents (ftp://ftp.cencenelec.eu/EN/IPR/Patents/IPRdeclaration.pdf). SIST EN 14179-1:2016
EN 14179-1:2016 (E) 6 1 Scope This European Standard specifies the heat soak process system together with tolerances, flatness, edgework, fragmentation and physical and mechanical characteristics of monolithic flat heat soaked thermally toughened soda lime silicate safety glass for use in buildings. Curved heat soaked thermally toughened soda lime silicate safety glass is not part of this European Standard. Other requirements, not specified in this European Standard, can apply to heat soaked thermally toughened soda lime silicate safety glass which is incorporated into assemblies, e.g. laminated glass or insulating units, or undergo an additional treatment, e.g. coating. The additional requirements are specified in the appropriate product standard. Heat soaked thermally toughened soda lime silicate safety glass, in this case, does not lose its bending strength characteristics and its resistance to temperature differentials. Surface finished glasses (e.g. sandblasted, acid etched) after toughening are not covered by this European Standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 572-1, Glass in building - Basic soda lime silicate glass products - Part 1: Definitions and general physical and mechanical properties EN 572-2, Glass in building - Basic soda lime silicate glass products - Part 2: Float glass EN 572-4, Glass in building - Basic soda lime silicate glass products - Part 4: Drawn sheet glass EN 572-5, Glass in building - Basic soda lime silicate glass products - Part 5: Patterned glass EN 572-8, Glass in building - Basic soda lime silicate glass products - Part 8: Supplied and final cut sizes 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) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 heat soaked thermally toughened soda lime silicate 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 and which has a known level of residual risk of spontaneous breakage due to the presence of critical nickel sulphide (NiS) inclusions Note 1 to entry: 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. SIST EN 14179-1:2016
EN 14179-1:2016 (E) 7 3.2 level of residual risk risk of spontaneous breakage of heat soaked thermally toughened soda lime silicate safety glass, on a statistical basis, due to the presence of critical nickel sulphide inclusions, is no more than one breakage per 400 t of heat soaked thermally toughened soda lime silicate safety glass 3.3 flat heat soaked thermally toughened soda lime silicate safety glass heat soaked thermally toughened soda lime silicate safety glass that has not been deliberately given a specific profile during manufacture 3.4 curved heat soaked thermally toughened soda lime silicate safety glass heat soaked thermally toughened soda lime silicate safety glass which has been deliberately given a specific profile during manufacture Note 1 to entry: This product is excluded from the scope. 3.5 heat soaked enamelled thermally toughened soda lime silicate safety glass heat soaked thermally toughened soda lime silicate safety glass which has a ceramic frit fired into the surface during the toughening process Note 1 to entry: After toughening, the ceramic frit becomes an integral part of the glass. Note 2 to entry: In the UK, this glass is also known as opaque heat soaked thermally toughened soda lime silicate safety glass. Note 3 to entry: 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. 3.6 horizontal process process in which the glass is supported on horizontal rollers 3.7 air cushion process process in which the glass is supported by an air cushion with or without additional rollers Note 1 to entry: In this process, the glass will be between horizontal and 45° of horizontal. 3.8 vertical process process in which the glass is suspended by tongs 3.9 edge deformation deformation of the edge cause by the tong marks for vertically toughened glass 3.10 edge lift distortion produced in horizontal toughened glass, at the leading and trailing edge of the plate SIST EN 14179-1:2016
EN 14179-1:2016 (E) 8 3.11 perimeter deformation distortion around the edge of toughened glass manufactured by air cushion process 3.12 local distortion local deformation of vertically toughened glass underneath the tong marks 3.13 overall bow deformation of the whole pane of toughened glass caused by the heating and cooling process 3.14 roller wave distortion distortion produced in horizontally toughened glass as a result of the glass during toughening process being in contact with the rollers 3.15 wave distortion distortion produced in toughened glass manufactured by air cushion process as a result of the glass toughening process 4 Glass products Heat soaked thermally toughened soda lime silicate safety glass shall be made from a monolithic glass product generally corresponding to one of the following standards: — soda lime silicate glass according to EN 572-1; — float glass according to EN 572-2; — drawn sheet glass according to EN 572-4; — patterned glass according to EN 572-5; — supplied and final cut sizes according to EN 572-8; — coated glass according to EN 1096-1. Glass of nominal thicknesses other than those covered in the above standards is possible. 5 Manufacturing processes 5.1 General Heat soaked thermally toughened soda time silicate safety glass is manufactured as follows: Basic soda lime silicate glass products (see Clause 4) are cut to size, shaped and edgeworked (see Clause 9). The prepared glass panes are then thermally toughened (see 5.2). The thermally toughened panes are then subjected to the heat soak process cycle. After manufacture, the heat soaked thermally toughened soda lime silicate glass shall comply with the fragmentation test (see Clause 10) and mechanical strength requirement (see 11.4). SIST EN 14179-1:2016
EN 14179-1:2016 (E) 9 5.2 Toughening process The cut, shaped and edgeworked glasses are toughened. The glasses toughened by the horizontal or air cushion or vertical process shall comply with the flatness criteria (see 8.3). The thermally toughened soda lime silicate safety glass shall have a level of fragmentation that will ensure that after the glass has been through the heat soak process, and subsequently tested to the fragmentation test (see Clause 10), it shall comply with 10.5. 5.3 Heat soak process cycle 5.3.1 General The heat soak process cycle consists of a heating phase, a holding phase and a cooling phase (see Figure 1).
Key T glass temperature at any point, °C d ambient temperature t time, h a heating phase 1 first glass to reach 250 °C b holding phase 2 last glass to reach 250 °C c cooling phase Figure 1 — Heat soak process cycle 5.3.2 Heating phase The heating phase commences with all the glasses at ambient temperature and concludes when the surface temperature of the last glass reaches 250 °C. The maximum heating rate is 3° C per minute. The time to reach this temperature is defined in the calibration process. This time will be dependent on the size of the oven, the amount of glass to be treated, the separation between glasses and the heating system capacity. NOTE 1 The glass separation and rate of heating should be controlled to minimize the risk of glass breakage as a result of thermal stress. To facilitate economic heating, the air temperature within the oven may exceed 290 °C. However, the glass surface temperature shall not be allowed to exceed 290 °C. The period of glass surface temperature in excess of 270 °C shall be minimized. NOTE 2 Care should be taken to ensure the maximum temperature of the glass does not exceed 270° C as there is a possibility of the nickel sulphide inclusion reconverting. SIST EN 14179-1:2016
EN 14179-1:2016 (E) 10 5.3.3 Holding phase The holding phase commences when the surface temperature of all the glasses has reached a temperature of 250 °C. The minimum duration of the holding phase is 2 hours. Precise oven control is necessary in order to ensure that the glass surface temperature shall be maintained in the range of 260 °C ± 10 °C during the holding phase. 5.3.4 Cooling phase The cooling phase commences when the last glass to reach 250 °C has completed its holding phase, i.e. been held for minimum 2 hours at 260 °C ± 10 °C. During this phase the glass temperature shall be brought down to ambient temperature. The cooling phase can be concluded when the air temperature in the oven reaches 70 °C. The rate of cooling should be controlled to minimize the risk of glass breakage as a result of thermal stress. 6 Heat soak process system 6.1 General The heat soak process system consists of: — oven (see 6.2); — glass support (see 6.3); — separation system (see 6.4). The oven shall be calibrated, see 6.5 and Annex A, and this determines the method of operation of the heat soak process system during manufacture of heat soaked thermally toughened soda lime silicate safety glass. 6.2 Oven The oven shall be heated by convection and shall allow an unhindered air circulation around each glass pane. In the event of glass breakage the airflow shall not be hindered. The airflow in the oven shall be led parallel to the glass surfaces. The openings in the oven for the air ingress / egress should be designed to ensure that fragments of broken glass do not cause blockages. 6.3 Glass support Glasses may be supported vertically or horizontally. The glasses shall not be fixed or clamped, they have to be supported to allow free movement. NOTE Vertically means true vertical or up to 15° either side of true vertical. The distance between glasses affects the airflow, heat exchange and the heating time. Glass to glass contact shall not be allowed. 6.4 Glass separation The glasses shall be separated in a manner that does not hinder the airflow. The separators shall also not hinder the airflow e.g. see Figure 2. SIST EN 14179-1:2016
EN 14179-1:2016 (E) 11 Dimensions in millimetres
Figure 2 — Example of a vertical glass separator The minimum separation of the glasses shall be determined during the calibration of the oven, see 6.5 and Annex A. Generally, a minimum separation of 20 mm is recommended (see Figure 3). NOTE If glasses of very different size are put on the same stillage, they will require greater separation in order to prevent glass breakage when the furnace is opened after the heat soak process. The same applies to glasses with holes, notches and cut-outs.
Figure 3 — Recommended separation between glass The positioning of the separators, material of the manufacture and their shape shall be specified during the calibration test of the oven and shall be reproduced during the manufacturing process. 6.5 Calibration The heat soak system, e.g. oven, glass separation, separators, etc., shall be calibrated, see Annex A. The calibration shall determine the heating phase of the process, glass separation distance, the positioning, material and shape of separators, the type and positioning of stillage(s) and define the operating conditions for use during manufacture. SIST EN 14179-1:2016
EN 14179-1:2016 (E) 12 7 Fracture characteristics The fracture characteristics of heat soaked thermally toughened soda lime silicate safety glass are directly related to the amount of surface compression. These properties are not size dependent. When the heat soaked thermally toughened soda lime silicate safety glass is manufactured with the correct degree of surface compression then in the event of breakage heat soaked thermally toughened soda lime silicate 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). 8 Dimensions and tolerances 8.1 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 Patterned Drawn sheet New antique drawn sheet 2 ±0,2 not manufactured ±0,2 not manufactured 3 ±0,2 ±0,5 ±0,2 not manufactured 4 ±0,2 ±0,5 ±0,2 ±0,3 5 ±0,2 ±0
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