EN 1748-1-1:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v stavbah - Posebni osnovni proizvodi - 1. del: Borosilikatno steklo -1-1. del: Definicija in splošne fizikalne in mehanske lastnostiGlas im Bauwesen - Spezielle Basiserzeugnisse - Borosilicatgläser - Teil 1-1: Definitionen und allgemeine physikalische und mechanische EigenschaftenVerre dans la construction - Produits de base spéciaux - Verres borosilicates - Partie 1-1 : Définitions et propriétés physiques et mécaniques généralesGlass in building - Special basic products -Borosilicate glasses - Part 1-1: Definition 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 1748-1-1:2004SIST EN 1748-1-1:2004en01-november-2004SIST EN 1748-1-1:2004SLOVENSKI
STANDARDSIST EN 1748-2:19991DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1748-1-1September 2004ICS 01.040.81; 81.040.20Supersedes EN 1748-1:1997
English versionGlass in building - Special basic products -Borosilicate glasses -Part 1-1: Definition and general physical and mechanicalpropertiesVerre dans la construction - Produits de base spéciaux -Verres borosilicates - Partie 1-1 : Définitions et propriétésphysiques et mécaniques généralesGlas im Bauwesen - Spezielle Basiserzeugnisse -Borosilicatgläser - Teil 1-1: 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 1748-1-1:2004: ESIST EN 1748-1-1:2004

This document (EN 1748-1-1:2004) 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 1748-1:1997. This document consists of 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 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.
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 borosilicate glasses 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 definitions apply. 3.1 borosilicate glass silicate glass containing between 7 % and 15 % boron oxide. As a result of the composition it has a high thermal shock resistance and a very high hydrolytic and acid resistance. 3.2 borosilicate float glass flat, transparent or translucent, clear or tinted borosilicate glass having parallel and polished faces obtained by continuous casting and flotation on a metal bath. 3.3 drawn sheet borosilicate glass flat, transparent or translucent, clear or tinted borosilicate glass obtained by continuous drawing of a regular thickness and with two surfaces fire polished. 3.4 rolled borosilicate glass flat, transparent or translucent, clear or tinted borosilicate glass obtained by rolling.
3.5 cast borosilicate glass flat, transparent or translucent, clear or tinted borosilicate glass 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 ribbon as shown in Figure 1, except for cast borosilicate glass which does not have a direction of draw. SIST EN 1748-1-1:2004

Key : Direction of draw Figure 1 — Relationship of length, width and direction of draw 3.7 stock sizes glass delivered in manufacturers standard stock sizes. 3.8 final cut size a pane of glass that has been cut down to the dimensions being required either for installation or processing into a final product e.g. insulating glass units, thermally toughened safety glass. 3.9 optical faults these are faults, which lead to distortions on the appearance of objects observed through the glass. 3.10 visual faults these are faults, which alter the visual quality of the glass. They are spot faults and linear / extend faults. 3.11 spot faults a spot fault is a nucleus, which is sometimes accompanied by a halo of distorted glass. 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, in the form of deposits, marks or scratches that occupy an extended length or area. 3.13 edge defects these defects can occur on the edge of a cut size piece in the form of entrant and emergent faults and / or bevels. 3.14 concentration, c the sum of the lengths of gaseous inclusions greater than 1,0 mm in any circle of 400 mm diameter. SIST EN 1748-1-1:2004

SiO2
70 % to 87 %  Boron Oxide
B2O3
7 % to 15 %  Sodium Oxide
Na2O
0 % to 8 %  Potassium Oxide
K2O
0 % to 8 %  Aluminium Oxide
Al2O3
0 % to 8 %  Others
0 % to 8 %
4.2 Tint Body tinted glass 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 the glass used to manufacture basic products are given in Table 1. These values, for normal annealed glass without any further toughening, are not precise requirements with which the glass shall strictly comply, but are the generally accepted figures for use in calculations where a high degree of accuracy is not required.
Pa to 7 x 1010
Pa Poisson's ratio µ 0,2 Characteristic bending strength fg,k 45 x 106 Pa [1] Specific heat capacity cp 0,8 x 103 J/(kg*K) Nominal value of average coefficient of linear expansion between 20 oC and 300 oC α Class 1: (3,1 to 4,0)x10-6/K Class 2: (4,1 to 5,0)x10-6/K Class 3: (5,1 to 6,0)x10-6/K Resistance against temperature differential and sudden temperature change
80 K [2] Thermal conductivity λ 1 W/(m*K) Mean refractive index to visible radiation (380 nm to 780 nm) n 1,5 Emissivity (corrected) ε
0,837 [1]
A design method will be made available from TC 129 WG8 (prEN 13473) [2]
Generally accepted value that is influenced by edge quality and glass type
5.2 Definition of clear borosilicate glass A borosilicate glass product is defined as clear borosilicate glass when it is not tinted and when the light transmittance of the glass material unmodified by the possible presence of a coating and/or surface roughness of, for example, a rolled borosilicate glass, complies with 5.2.1 and 5.2.2.
In order to measure the light transmittance characteristics of glass, to determine whether it can be designated as clear glass, it is necessary, in some cases, to carry out a pre-treatment:
 coatings on smooth surfaces have to be eliminated, without modifying the thickness of the glass substrate.
 rough surfaces, with or without coatings, have to be eliminated by smoothing and polishing.
The thickness of the glass will be modified by this process. The light transmittance of the glass substrate shall be measured with its surfaces in a polished condition. Clear glass
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