SIST EN 1748-2-1:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v stavbah - Posebni osnovni proizvodi – Steklena keramika – 2-1. del: Definicije in splošne fizikalne in mehanske lastnostiGlas im Bauwesen - Spezielle Basiserzeugnisse - Glaskeramik - Teil 2-1: Definitionen und allgemeine physikalische und mechanische EigenschaftenVerre dans la construction - Produits de base spéciaux - Vitrocéramiques - Partie 2-1: Définitions et propriétés physiques et mécaniques généralesGlass in building - Special basic products - Glass ceramics - Part 2-1
Definitions and general physical and mechanical properties81.040.20Steklo v gradbeništvuGlass in building01.040.81Glass and ceramics industries (Vocabularies)ICS:Ta slovenski standard je istoveten z:EN 1748-2-1:2004SIST EN 1748-2-1:2004en01-november-2004SIST EN 1748-2-1:2004SLOVENSKI
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SIST EN 1748-2-1:2004



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1748-2-1September 2004ICS 01.040.81; 81.040.20Supersedes EN 1748-2:1997
English versionGlass in building - Special basic products - Glass ceramics -Part 2-1
Definitions and general physical and mechanicalpropertiesVerre dans la construction - Produits de base spéciaux -Partie 2-1 Vitrocéramiques - Définition et descriptionGlas im Bauwesen - Spezielle Basiserzeugnisse -Glaskeramik - Teil 2-1: Definitionen und allgemeinephysikalische und mechanische EigenschaftenThis European Standard was approved by CEN on 21 June 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1748-2-1:2004: ESIST EN 1748-2-1:2004



EN 1748-2-1:2004 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.4 4 Chemical composition.6 4.1 Principal Constituents.6 4.2 Tint.6 5 Physical and mechanical characteristics.6 5.1 General characteristics.6 5.2 Definition of clear glass ceramics.7 5.3 Stability of physical and chemical characteristics.8 6 Dimensional requirements.8 6.1 Manufacturing dimensions.8 6.1.1 Stock sizes.8 6.1.2 Final cut sizes.8 6.2 Thickness.8 6.2.1 Tolerances.8 6.3 Length, width, squareness and tolerances.9 7 Quality requirements.10 7.1 Methods of observation and measurement.10 7.1.1 Optical faults.10 7.1.2 Visual faults.10 7.2 Acceptance levels.11 7.2.1 Optical faults, spot faults, linear/extended faults.11 7.2.2 Edge defects for final cut sizes.12 8 Designation.14 Bibliography.15
SIST EN 1748-2-1:2004



EN 1748-2-1:2004 (E) 3 Foreword
This document (EN 1748-2-1:2004) has been prepared by Technical Committee CEN /TC 129 "Glass in Building", the secretariat of which is held by BIN. 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 March 2005, and conflicting national standards shall be withdrawn at the latest by March 2005.
This document supersedes EN 1748-2:1997. This document consists of the following parts: 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: Evaluation of conformity/Product standard According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 1748-2-1:2004



EN 1748-2-1:2004 (E) 4 1 Scope This document defines, specifies and classifies glass ceramics for use in building.
It indicates their chemical composition, main physical and mechanical properties, dimensional and minimum quality requirements (in respect of optical and visual faults). This document applies to glass ceramics supplied in stock sizes or in cut sizes for final end use. This document does not apply to final cut sizes having a dimension less than 100 mm or a surface area less than 0,05 m². 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 410, Glass in building - Determination of luminous and solar characteristics of glazing 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. The glass is obtained by normal glass manufacturing methods, e.g. casting, floating, drawing, 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. 3.3 drawn sheet glass ceramics flat, transparent or translucent, clear or tinted glass ceramics obtained by continuous drawing, initially vertically, of a regular thickness and with the two surfaces fire polished. 3.4 rolled glass ceramics flat, transparent or translucent, clear or tinted glass ceramics obtained by rolling. 3.5 cast glass ceramics flat, transparent or translucent, clear or tinted glass ceramics obtained by casting. 3.6 nominal length, H and nominal width, B pane length or pane width defined with reference to the direction of draw
of the glass ceramics ribbon as shown in Figure 1. SIST EN 1748-2-1:2004



EN 1748-2-1:2004 (E) 5
Key : Direction of draw Figure 1 — Relationship of length, width and direction of draw 3.7 stock sizes glass ceramics delivered in manufacturers standard stock sizes. 3.8 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 e.g. insulating glass units. 3.9 optical faults faults, which lead to distortions on the appearance of objects observed through the glass ceramics. 3.10 visual faults faults, which alter the visual quality of the glass ceramics. They are spot faults and linear / extend faults. 3.11 spot faults spot fault is a nucleus, which is sometimes accompanied by a halo of distorted glass ceramics. The dimension of a spot fault comprising a nucleus with a halo is obtained by multiplying the dimension of the nucleus by a factor of approximately 3. 3.12 linear / extended faults these faults can be on or in the glass ceramics, in the form of deposits, marks or scrat
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