Glass in Building - Special basic products - Glass ceramics - Part 2-1: Definitions and general physical and mechanical properties

This European Standard specifies and classifies special basic products - glass ceramics, indicates their chemical composition, their main physical and mechanical characteristics, their dimensional and minimum quality requirements (in respect of optical and visual faults).
This European Standard applies to special basic products - glass ceramics supplied in stock sizes, supplied sizes or in cut sizes for final end use.
This European Standard does not apply to final cut sizes having a dimension less than 100 mm or a surface area less than 0,05 m2.

Glas im Bauwesen - Spezielle Basiserzeugnisse - Glaskeramik - Teil 2-1: Definitionen und allgemeine physikalische und mechanische Eigenschaften

Diese Europäische Norm legt spezielle Basiserzeugnisse aus Glaskeramik fest, klassifiziert diese und macht Angaben über deren chemische Zusammensetzung, wesentliche physikalische und mechanische Eigenschaften, Anforderungen an die Maße und Mindestanforderungen an die Qualität (in Hinsicht auf optische und sichtbare Fehler).
Diese Europäische Norm gilt für spezielle Basiserzeugnisse aus Glaskeramik, die in Standardabmessungen, in Liefermaßen oder in Festmaßen für ihren Verwendungszweck geliefert werden.
Diese Europäische Norm gilt nicht für Glaskeramik mit Festmaßen von weniger als 100 mm oder mit einer Oberfläche von weniger als 0,05 m2.

Verre dans la construction - Produits de base spéciaux - Vitrocéramiques - Partie 1 : Définitions et propriétés physiques et mécaniques générales

La présente Norme européenne spécifie et classe les produits spéciaux de base - vitrocéramiques, indique leur composition chimique, leurs principales propriétés physiques et mécaniques, leurs exigences dimensionnelles et qualitatives minimales (compte tenu des défauts optiques et d'aspect).
La présente Norme européenne s'applique aux produits de base spéciaux - vitrocéramiques fournis en dimensions standard, en dimensions livrées ou en dimensions découpées en mesures fixes en vue de leur usage final.
La présente Norme européenne ne s'applique pas aux vitrocéramiques découpées en mesures fixes en vue de leur usage final dont l'une des dimensions est inférieure à 100 mm ou dont l'aire de la surface est inférieure à 0,05 m².

Steklo v stavbah - Posebni osnovni proizvodi - Steklena keramika - 2-1. del: Definicije in splošne fizikalne in mehanske lastnosti TC: Steklo v gradbeništvu -

General Information

Status
Not Published
Public Enquiry End Date
14-Oct-2017
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
28-Aug-2017
Due Date
15-Jan-2018
Completion Date
14-Nov-2017

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SLOVENSKI STANDARD
oSIST prEN 1748-2-1:2017
01-oktober-2017
Steklo v stavbah - Posebni osnovni proizvodi - Steklena keramika - 2-1. del:
Definicije in splošne fizikalne in mehanske lastnosti

Glass in Building - Special basic products - Glass ceramics - Part 2-1: Definitions and

general physical and mechanical properties

Glas im Bauwesen - Spezielle Basiserzeugnisse - Glaskeramik - Teil 2-1: Definitionen

und allgemeine physikalische und mechanische Eigenschaften

Verre dans la construction - Produits de base spéciaux - Vitrocéramiques - Partie 1 :

Définitions et propriétés physiques et mécaniques générales
Ta slovenski standard je istoveten z: prEN 1748-2-1
ICS:
01.040.81 6WHNODUVNDLQNHUDPLþQD Glass and ceramics
LQGXVWULMD 6ORYDUML industries (Vocabularies)
81.040.20 Steklo v gradbeništvu Glass in building
81.060.01 Keramika na splošno Ceramics in general
oSIST prEN 1748-2-1:2017 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 1748-2-1:2017
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oSIST prEN 1748-2-1:2017
DRAFT
EUROPEAN STANDARD
prEN 1748-2-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2017
ICS 01.040.81; 81.040.20; 81.060.01 Will supersede EN 1748-2-1:2004
English Version
Glass in Building - Special basic products - Glass ceramics -
Part 2-1: Definitions and general physical and mechanical
properties

This draft European Standard is submitted to CEN members for enquiry. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey 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
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1748-2-1:2017 E

worldwide for CEN national Members.
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oSIST prEN 1748-2-1:2017
prEN 1748-2-1:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 4

4 Chemical composition ................................................................................................................................... 6

4.1 General ................................................................................................................................................................ 6

4.2 Tint ....................................................................................................................................................................... 7

5 Physical and mechanical characteristics ................................................................................................ 7

5.1 General characteristics ................................................................................................................................. 7

5.2 Characteristic bending strength ................................................................................................................ 8

5.3 Designation of clear glass ceramics .......................................................................................................... 8

5.3.1 General ................................................................................................................................................................ 8

5.3.2 Clear transparent glass ceramics .............................................................................................................. 9

5.3.3 Clear translucent glass ceramics ............................................................................................................... 9

5.4 Stability of physical and chemical characteristics ........................................................................... 10

6 Dimensional requirements....................................................................................................................... 10

6.1 Manufacturing dimensions ....................................................................................................................... 10

6.1.1 Stock sizes ....................................................................................................................................................... 10

6.1.2 Supplied and final cut sizes ...................................................................................................................... 10

6.2 Thickness and thickness tolerances ...................................................................................................... 10

6.3 Length, width and squareness ................................................................................................................. 11

7 Quality requirements ................................................................................................................................. 11

7.1 General ............................................................................................................................................................. 11

7.2 Quality criteria and their evaluation .................................................................................................... 12

7.2.1 Optical .............................................................................................................................................................. 12

7.2.2 Appearance ..................................................................................................................................................... 12

7.3 Methods of observation and measurement ........................................................................................ 12

7.3.1 Optical faults .................................................................................................................................................. 12

7.3.2 Visual faults (spot faults, linear/extended faults), all types of glass ceramics ...................... 13

7.4 Acceptance levels ......................................................................................................................................... 14

7.4.1 Optical faults .................................................................................................................................................. 14

7.4.2 Visual faults (spot faults, linear/extended faults, all types of glass ceramics) ...................... 14

7.5 Edge defects for final cut sizes ................................................................................................................. 15

7.5.1 Entrant and emergent faults .................................................................................................................... 15

7.5.2 Bevel ................................................................................................................................................................. 16

7.5.3 Limitations on edge defects ...................................................................................................................... 16

8 Designation..................................................................................................................................................... 16

Annex A (informative) Complementary information related to REACH ................................................. 18

Bibliography ................................................................................................................................................................. 19

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prEN 1748-2-1:2017 (E)
European foreword

This document (prEN 1748-2-1:2017) 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 CEN Enquiry.
This document will supersede EN 1748-2-1:2004.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.
The main changes compared to the previous edition are the following:
a) Clause 1: drawn and casted process have been removed;

b) Chemical composition has been modified in Table 1 to express composition in elements;

c) Clause 5: luminous transmittance have been modified;

d) Clause 6: new thickness tolerances have been added for floated glass ceramics and sub Clause 6.3

“Tolerances and squareness” has been completely revised; the squareness of rectangular glass

panes is now expressed by the difference between its diagonals;

e) Clause 7 has been completely revised (including the Zebra method of observation optical faults);

f) Categories of defects have been removed, only one quality is defined (Table 9);

g) a new informative Annex A given complementary information related to REACH has been added;

h) the document has been editorial revised.
EN 1748 is currently composed with the following parts:

— EN 1748-1-1, Glass in building — Special basic products —Borosilicate glasses — Part 1-1: Definition

and general physical and mechanical properties;

— EN 1748-1-2, Glass in building — Special basic products — Borosilicate glasses — Part 1-2:

Evaluation of conformity/Product standard;

— EN 1748-2-1, Glass in Building — Special basic products — Glass ceramics — Part 2-1: Definitions

and general physical and mechanical properties;

— EN 1748-2-2, Glass in building — Special basic products — Glass ceramics — Part 2-2: Product

standard.
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oSIST prEN 1748-2-1:2017
prEN 1748-2-1:2017 (E)
1 Scope

This European Standard specifies and classifies special basic products - glass ceramics, indicates their

chemical composition, their main physical and mechanical characteristics, their dimensional and

minimum quality requirements (in respect of optical and visual faults).

This European Standard applies to special basic products - glass ceramics supplied in stock sizes,

supplied sizes or in cut sizes for final end use.

This European Standard does not apply to final cut sizes having a dimension less than 100 mm or a

surface area less than 0,05 m .
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 410:2011, Glass in building — Determination of luminous and solar characteristics of glazing

ISO 9385:1990, Glass and glass-ceramics — Knoop hardness test
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
glass ceramics
type of glass consisting of a crystalline and a residual glass phase

Note 1 to entry: The glass is obtained by normal glass manufacturing methods, e.g. floating or rolling and is

subsequently subjected to a heat treatment which transforms, in a controlled manner, part of the glass into a fine

grained crystalline phase; the glass ceramics has properties which deviate from those of the glass from which it

was transformed.
3.2
floated glass ceramics

flat, transparent or translucent, clear or tinted glass ceramics having parallel and polished faces

obtained by continuous casting and flotation on a metal bath
Note 1 to entry: In French called 'glace' and in German 'Floatglas'.
3.3
rolled glass ceramics

flat, transparent or translucent, clear or tinted glass ceramics obtained by continuous casting and

rolling
3.4
length, H and width, B

defined with reference to the direction of draw of the glass ribbon as shown in Figure 1

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oSIST prEN 1748-2-1:2017
prEN 1748-2-1:2017 (E)
Key
1 → - direction of draw
H - length
B - width
Figure 1 — Relationship between length, width and direction of draw
3.5
stock sizes
glass ceramics delivered in manufacturer's standard stock sizes
3.6
supplied size

pane of glass ceramics that has been supplied either as raw material for further processing and/or

cutting down to a size for installation
Note 1 to entry: This is a size outside the stock size.
3.7
final cut size

pane of glass ceramics that has been cut down to the dimensions being required either for installation

or processing into a final product

Note 1 to entry: Examples of processed final products are insulating glass units or laminated glass of those

dimensions.
3.8
optical fault

fault which lead to distortions on the appearance of objects observed through the glass ceramics

3.9
visual fault
fault which alter the visual quality of the glass ceramics
Note 1 to entry: Visual faults include spot faults and linear / extended faults.
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prEN 1748-2-1:2017 (E)
3.10
spot fault
nucleus which is generally accompanied by a halo of distorted glass
Note 1 to entry: Spot fault can be solid inclusions, bubbles, etc.
3.11
halo
area locally distorted, generally around a point defect
3.12
linear / extended fault

fault which can be on or in the glass ceramics, in the form of deposits, marks or scratches that occupy an

extended length or area
3.13
edge defect

defect which can occur on the edge of a cut size piece in the form of entrant and emergent fault and/or

bevel
3.14
concentration

sum of the lengths of gaseous inclusions > 1,0 mm in any circle of 400 mm diameter

4 Chemical composition
4.1 General

The special basic products covered by this European Standard are all manufactured from glass

ceramics.

The magnitude of the proportions by mass of the constituents of glass ceramics covered by this

standard is given in Table 1, see also Annex A.
NOTE Oxygen is not mentioned in Table 1 (see Annex A).
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prEN 1748-2-1:2017 (E)

Table 1 — Magnitude of the proportions by mass of the constituents of glass ceramics

Constituents Proportion by mass of element
Silicon (Si) 23 % - 38 %
Aluminium (Al) 7,9 % - 14,5 %
Lithium (Li) 0 % - 2,4 %
Sodium (Na) 0 % - 1,5 %
Calcium (Ca) 0 % - 5,8 %
Magnesium (Mg) 0 % - 4,9 %
Zinc (Zn) 0 % - 4,1 %
Potassium (K) 0 % - 1,7 %
Zirconium (Zr) 0 % - 3,7 %
Titanium (Ti) 0 % - 3,0 %
Barium (Ba) 0 % - 7,2 %
a < 5 %
Other components excluding oxygen

Properties other than photometric characteristics shall not be significantly altered by these other components

4.2 Tint
Body tinted glass ceramics is obtained by the addition of suitable materials.
5 Physical and mechanical characteristics
5.1 General characteristics

Conventional numerical values for the physical and mechanical characteristics of glass ceramics

excluding ‘Characteristic bending strength (f ) are given in Table 2. These values are not precise

g,k

requirements with which the glass ceramics shall strictly comply, but are the generally accepted figures

for use in calculations where a high degree of accuracy is not required.
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prEN 1748-2-1:2017 (E)
Table 2 — Physical and mechanical characteristics of glass ceramics
Characteristic Symbol Value and unit
Density (at 18°C) ρ 2400 kg/m to
2600 kg/m
Hardness (Knoop) HK a
0,1/20
600 - 750
Young's modulus (modulus of elasticity) E 9 × 10 Pa
...

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