SIST EN 15681-1:2016
(Main)Glass in building - Basic alumino silicate glass products - Part 1: Definitions and general physical and mechanical properties
Glass in building - Basic alumino silicate glass products - Part 1: Definitions and general physical and mechanical properties
This Part of this European Standard specifies and classifies basic alumino silicate glass products, indicates their chemical composition, their main physical and mechanical characteristics, their dimensional and their minimum quality requirements (in respect of optical and visual faults).
This European Standard applies to basic alumino silicate glasses 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 - Basiserzeugnisse aus Alumo-Silicatglas - Teil 1: Definitionen und allgemeine physikalische und mechanische Eigenschaften
Dieser Teil der Europäischen Norm legt Basiserzeugnisse aus Alumo-Silicatglas fest, klassifiziert sie und gibt deren chemische Zusammensetzung, deren wichtigste physikalischen und mechanischen Eigenschaften sowie deren Maße und Mindestanforderungen an die Qualität (in Hinsicht auf optische und sichtbare Fehler) an.
Die vorliegende Europäische Norm gilt für Basiserzeugnisse aus Alumo-Silicatglas in Standardabmessungen, Liefermaßen oder in Festmaßen für die Endanwendung.
Diese Europäische Norm gilt nicht für Festmaße mit einem Maß kleiner als 100 mm oder mit einer Oberfläche von weniger als 0,05 m2.
Verre dans la construction - Produits de base : verre aluminosilicate - Partie 1 : Définitions et propriétés physiques et mécaniques générales
La présente partie de cette Norme européenne spécifie et classe les produits verriers aluminosilicate de base et indique leur composition chimique, leurs principales caractéristiques physiques et mécaniques, ainsi que les exigences dimensionnelles et les exigences de qualité minimales (au regard des défauts optiques et visuels) qui s’y appliquent.
La présente Norme européenne s’applique aux verres aluminosilicates de base fournis aux mesures de stockage, aux mesures livrées ou aux mesures découpées pour l’utilisation finale.
La présente Norme européenne ne s’applique pas aux mesures découpées finales inférieures à 100 mm, ni aux superficies inférieures à 0,05 m2.
Steklo v gradbeništvu - Osnovni proizvodi iz aluminij-silikatnega stekla - 1. del: Definicije in splošne fizikalne in mehanske lastnosti
Ta del tega evropskega standarda določa in razvršča osnovne proizvode iz aluminij-silikatnega stekla, navaja njihovo kemično sestavo, njihove glavne fizikalne in mehanske lastnosti ter določa zahteve glede njihovih mer in minimalne kakovosti (v zvezi z optičnimi in vizualnimi napakami).
Ta evropski standard se uporablja za osnovne proizvode iz aluminij-silikatnega stekla, dobavljene v velikostih na zalogi, dobavljenih velikostih in velikostih razreza za končno uporabo.
Ta evropski standard ne zajema končnih velikosti razreza z merami manj kot 100 mm ali površino, manjšo od 0,05 m².
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - Osnovni proizvodi iz aluminij-silikatnega stekla - 1. del: Definicije in splošne fizikalne in mehanske lastnostiGlas im Bauwesen - Basiserzeugnisse aus Alumo-Silicatglas - Teil 1: Definitionen und allgemeine physikalische und mechanische EigenschaftenVerre dans la construction - Produits de base : verre aluminosilicate - Partie 1 : Définitions et propriétés physiques et mécaniques généralesGlass in building - Basic alumino silicate glass products - Part 1: Definitions and general physical and mechanical properties81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 15681-1:2016SIST EN 15681-1:2016en,fr,de01-junij-2016SIST EN 15681-1:2016SLOVENSKI
STANDARD
SIST EN 15681-1:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15681-1
January
t r s x ICS
z sä r v rä t r English Version
Glass in building æ Basic alumino silicate glass products æ Part
sã Definitions and general physical and mechanical properties Verre dans la construction æ Produits de base ã verre aluminosilicate æ Partie
s ã Définitions et propriétés physiques et mécaniques générales
Glas im Bauwesen æ Basiserzeugnisse aus AlumoæSilicatglas æ Teil
sã Definitionen und allgemeine physikalische und mechanische Eigenschaften This European Standard was approved by CEN on
u r November
t r s wä
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 andUnited 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 w x z sæ sã t r s x ESIST EN 15681-1:2016
EN 15681-1:2016 (E) 2 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 . 6 5 Physical and mechanical characteristics . 6 5.1 General characteristics . 6 5.2 Characteristic bending strength . 7 5.3 Designation of clear alumino silicate glass . 7 5.3.1 General . 7 5.3.2 Clear transparent alumino silicate glass . 8 5.3.3 Clear translucent alumino silicate glass . 8 5.4 Stability of physical and chemical characteristics . 9 6 Dimensional requirements. 9 6.1 Manufacturing dimensions . 9 6.1.1 Stock sizes . 9 6.1.2 Supplied and final cut sizes . 9 6.2 Thickness and thickness tolerances . 9 6.3 Length, width and squareness . 10 7 Quality requirements . 10 7.1 General . 10 7.2 Methods of observation and measurement . 11 7.2.1 Optical faults . 11 7.2.2 Visual faults (spot faults, linear/extended faults), all types of basic alumino silicate glass . 12 7.3 Acceptance levels . 13 7.3.1 Optical faults . 13 7.3.2 Visual faults (spot faults, linear/extended faults), all types of basic alumino silicate glass . 13 7.4 Edge defects for final cut sizes . 14 7.4.1 Entrant and emergent faults . 14 7.4.2 Bevel . 14 7.4.3 Limitations on edge defects . 14 8 Designation. 15 Annex A (informative)
Complementary information related to REACH . 16 Bibliography . 17
SIST EN 15681-1:2016
EN 15681-1:2016 (E) 3 European foreword This document (EN 15681-1:2016) 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 July 2016, and conflicting national standards shall be withdrawn at the latest by July 2016. 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 has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This European Standard consists of the following parts: — EN 15681-1 Glass in Building — Basic alumino silicate glass products — Part 1: Definitions and general physical and mechanical properties; — EN 15681-2 Glass in Building — Basic alumino silicate glass products — Part 2: Evaluation of conformity / Product standard1. 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, 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.
1 Standard under development. SIST EN 15681-1:2016
EN 15681-1:2016 (E) 4 1 Scope This Part of this European Standard specifies and classifies basic alumino silicate glass products, indicates their chemical composition, their main physical and mechanical characteristics, their dimensional and their minimum quality requirements (in respect of optical and visual faults). This European Standard applies to basic alumino silicate glasses 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. 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, Glass in building - Determination of luminous and solar characteristics of glazing ISO 9385, 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 alumino silicate glass silicate glass containing between 5,8 % to 16,2 % aluminium and with a chemical composition according to 4.1 of this standard 3.2 alumino silicate float glass flat, transparent, clear or tinted alumino silicate glass having parallel and polished faces obtained by continuous casting and floatation on a metal bath Note 1 to entry: In French called 'glace' and in German 'Floatglas'. 3.3 alumino silicate drawn sheet glass flat, transparent or translucent, clear or tinted basic alumino silicate glass obtained by continuous drawing of a regular thickness and with the two surfaces fire polished 3.4 alumino silicate rolled glass flat, transparent or translucent, clear or tinted basic alumino silicate glass obtained by rolling 3.5 length, H and width, B defined with reference to the direction of draw of the glass ribbon as shown in Figure 1 SIST EN 15681-1:2016
EN 15681-1:2016 (E) 5
Key I direction of draw H length B width Figure 1 — Relationship between length, width and direction of draw 3.6 stock sizes glass delivered in manufacturers standard stock sizes 3.7 supplied size pane of glass 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 that is outside the stock size. 3.8 final cut size pane of glass 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 and thermally toughened safety glass of those dimensions. 3.9 optical fault fault which leads to distortions in the appearance of objects observed through the glass 3.10 visual fault fault which alters the visual quality of the glass Note 1 to entry: Visual faults include spot faults and linear / extended faults. 3.11 spot fault spherical or quasi spherical fault which is produced by differing mechanisms, e.g. gaseous inclusion, solid inclusion, mark or deposit of small size 3.12 linear / extended faults fault which can be on or in the glass, in the form of deposits, reams, marks or scratches that occupy an extended length or area SIST EN 15681-1:2016
EN 15681-1:2016 (E) 6 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 greater than 1,0 mm in any circle of 400 mm diameter 4 Chemical composition 4.1 General The basic glass products covered by this European Standard are all manufactured from alumino silicate glass. The magnitude of the proportions by mass of the constituents of alumino silicate glass covered by this standard is given in Table 1, see also Annex A Table 1 — Magnitude of the proportions by mass of the constituents of alumino silicate glass Constituents Proportion by mass of element Silicon (Si) 25,3 % to 35,1 % Aluminium (Al) 5,8 % to 16,2 %
32,1 % to 51,3 % Lithium (Li) 0 % to 3,7 % Sodium (Na) 0 % to 10,5 % Calcium (Ca) 0 % to 2,1 % Magnesium (Mg) 0 % to 5 % Zinc (Zn) 0 % to 2,4 % Potassium (K) 0 % to 7 % Zirconium (Zr) 0 % to 3,0 % Strontium (Sr) 0 % to 2,5 % Barium (Ba) 0 % to 3,6 % Other componentsa 0 % to 5 % a Properties other than photometric characteristics shall not be significantly altered by these other components 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 basic alumino silicate glass products excluding ‘Characteristic bending strength’ (fg;k) are given in Table 2. These values, for SIST EN 15681-1:2016
EN 15681-1:2016 (E) 7 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. Table 2 — General characteristic values of basic alumino silicate glass Characteristic Symbol Value and unit Density (at 18 °C)
2300 to 2600 kg/m3 Hardness (Knoop) HK0,1/20 400 to 700 a Young's modulus (modulus of elasticity)
E 70 to 90 x GPa Poisson's ratio
0,2 to 0,25 Specific heat capacity Cp 0,7 to 0,9 × 103 J/(kg*K) Nominal value of average coefficient of linear expansion between 20 °C and 300 °C
3,5 to 9,8 × 10 «6/K Resistance against temperature differential and sudden temperature change
60 K b Thermal conductivity
0,8 to 1,7 W/(m*K) Mean refractive index to visible radiation (at 589,3 nm) n 1,5 to 1,55 Emissivity (corrected)
0,837 a Knoop Hardness in accordance with ISO 9385 b Generally accepted value that is influenced by edge quality and glass type 5.2 Characteristic bending strength The characteristic bending strength value applies to quasi-static loading over a short time, e.g. wind loading, and relate to a 5 % probability of breakage at the lower limit of the 95 % confidence interval. The value of the characte
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - Osnovni proizvodi iz aluminij-silikatnega stekla - 1. del: Definicije in splošne fizikalne in mehanske lastnostiGlas im Bauwesen - Basiserzeugnisse aus Alumo-Silicatglas - Teil 1: Definitionen und allgemeine physikalische und mechanische EigenschaftenVerre dans la construction - Produits de base : verre aluminosilicate - Partie 1 : Définitions et propriétés physiques et mécaniques généralesGlass in building - Basic alumino silicate glass products - Part 1: Definitions and general physical and mechanical properties81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:FprEN 15681-1kSIST FprEN 15681-1:2015en,fr,de01-september-2015kSIST FprEN 15681-1:2015SLOVENSKI
STANDARD
kSIST FprEN 15681-1:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 15681-1
May 2015 ICS 81.040.20 English Version
Glass in building - Basic alumino silicate glass products - Part 1: Definitions and general physical and mechanical properties
Verre dans la construction - Produits de base: Verres alumino silicaté - Partie 1: Définitions et propriétés physiques et mécaniques générales
Glas im Bauwesen - Basiserzeugnisse aus Alumo-Silicatglas - Teil 1: Definitionen und allgemeine physikalische und mechanische Eigenschaften 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, 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 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 © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN 15681-1:2015 EkSIST FprEN 15681-1:2015
FprEN 15681-1:2015 (E) 2 Contents Page 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 .6 5 Physical and mechanical characteristics .6 5.1 General characteristics .6 5.2 Characteristic bending strength .7 5.3 Designation of clear alumino silicate glass .7 5.3.1 General .7 5.3.2 Clear transparent alumino silicate glass .8 5.3.3 Clear translucent alumino silicate glass .8 5.4 Stability of physical and chemical characteristics .9 6 Dimensional requirements .9 6.1 Manufacturing dimensions .9 6.1.1 Stock sizes .9 6.1.2 Supplied and final cut sizes .9 6.2 Thickness and thickness tolerances .9 6.3 Length, width and squareness . 10 7 Quality requirements . 10 7.1 General . 10 7.2 Methods of observation and measurement . 11 7.2.1 Optical faults . 11 7.2.2 Visual faults (spot faults, linear/extended faults), all types of basic alumino silicate glass . 12 7.3 Acceptance levels . 13 7.3.1 Optical faults . 13 7.3.2 Visual faults (spot faults, linear/extended faults), all types of basic alumino silicate glass . 13 7.4 Edge defects for final cut sizes . 14 7.4.1 Entrant and emergent faults . 14 7.4.2 Bevel . 14 7.4.3 Limitations on edge defects . 14 8 Designation . 15 Annex A (informative)
Complementary information related to REACH . 16 Bibliography . 17
kSIST FprEN 15681-1:2015
FprEN 15681-1:2015 (E) 3 Foreword This document (FprEN 15681-1:2015) 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 European Standard consists of the following parts: — EN 15681-1 Glass in Building — Basic alumino silicate glass products — Part 1: Definitions and general physical and mechanical properties; — EN 15681-2 Glass in Building — Basic alumino silicate glass products — Part 2: Evaluation of conformity / Product standard. kSIST FprEN 15681-1:2015
FprEN 15681-1:2015 (E) 4 1 Scope This Part of this European Standard specifies and classifies basic alumino silicate glass products, indicates their chemical composition, their main physical and mechanical characteristics, their dimensional and their minimum quality requirements (in respect of optical and visual faults). This European Standard applies to basic alumino silicate glasses 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. 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, Glass in building — Determination of luminous and solar characteristics of glazing ISO 9385, 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 alumino silicate glass silicate glass containing between 5,8 % to 16,2 % aluminium and with a chemical composition according to 4.1 of this standard 3.2 alumino silicate float glass flat, transparent, clear or tinted alumino silicate glass having parallel and polished faces obtained by continuous casting and floatation on a metal bath Note 1 to entry: In French called 'glace' and in German 'Floatglas'. 3.3 alumino silicate drawn sheet glass flat, transparent or translucent, clear or tinted basic alumino silicate glass obtained by continuous drawing of a regular thickness and with the two surfaces fire polished 3.4 alumino silicate rolled glass flat, transparent or translucent, clear or tinted basic alumino silicate glass obtained by rolling 3.5 length, H and width, B defined with reference to the direction of draw of the glass ribbon as shown in Figure 1 kSIST FprEN 15681-1:2015
FprEN 15681-1:2015 (E) 5
Key 1
direction of draw H
length B
width Figure 1 — Relationship between length, width and direction of draw 3.6 stock sizes glass delivered in manufacturers standard stock sizes 3.7 supplied size pane of glass 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 that is outside the stock size. 3.8 final cut size pane of glass 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 and thermally toughened safety glass of those dimensions. 3.9 optical fault fault which leads to distortions in the appearance of objects observed through the glass 3.10 visual fault fault which alters the visual quality of the glass Note 1 to entry: Visual faults include spot faults and linear / extended faults. 3.11 spot fault spherical or quasi spherical fault which is produced by differing mechanisms, e.g. gaseous inclusion, solid inclusion, mark or deposit of small size 3.12 linear / extended faults fault which can be on or in the glass, in the form of deposits, reams, 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 kSIST FprEN 15681-1:2015
FprEN 15681-1:2015 (E) 6 3.14 concentration sum of the lengths of gaseous inclusions greater than 1,0 mm in any circle of 400 mm diameter 4 Chemical composition 4.1 General The basic glass products covered by this European Standard are all manufactured from alumino silicate glass. The magnitude of the proportions by mass of the constituents of alumino silicate glass covered by this standard is given in Table 1, see also Annex A Table 1 — Magnitude of the proportions by mass of the constituents of alumino silicate glass Constituents Proportion by mass of element Silicon (Si) 25,3 % to 35,1 % Aluminium (Al) 5,8 % to 16,2 %
32,1 % to 51,3 % Lithium (Li) 0 % to 3,7 % Sodium (Na) 0 % to 10,5 % Calcium (Ca) 0 % to 2,1 % Magnesium (Mg) 0 % to 5 % Zinc (Zn) 0 % to 2,4 % Potassium (K) 0 % to 7 % Zirconium (Zr) 0 % to 3,0 % Strontium (Sr) 0 % to 2,5 % Barium (Ba) 0 % to 3,6 % Other componentsa 0 % to 5 % a Properties other than photometric characteristics shall not be significantly altered by these other components 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 basic alumino silicate glass products excluding ‘Characteristic bending strength’ (fg,kk) are given in Table 2. 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. kSIST FprEN 15681-1:2015
FprEN 15681-1:2015 (E) 7 Table 2 — General characteristic values of basic alumino silicate glass Characteristic Symbol Value and unit Density (at 18 °C)
2300 to 2600 kg/m3 Hardness (Knoop) HK0,1/20 400 to 700 a Young's modulus (modulus of elasticity)
E 70 to 90 x GPa Poisson's ratio
0,2 to 0,25 Specific heat capacity Cp 0,7 to 0,9 × 103 J/(kg*K) Nominal value of average coefficient of linear expansion between 20 °C and 300 °C . 3,5 to 9,8 × 10−6/K Resistance against temperature differential and sudden temperature change ‘ 60 K b Thermal conductivity
0,8 to 1,7 W/(m*K) Mean refractive index to visible radiation (at 589,3 nm) n 1,5 to 1,55 Emissivity (corrected) 0 0,837 a Knoop Hardness in accordance with ISO 9385 b Generally accepted value that is influenced by edge quality and glass type 5.2 Characteristic bending strength The characteristic bending strength value applies to quasi-static loading over a short time, e.g. wind loading, and relate to a 5 % probability of breakage at the lower limit of the 95 % confidence interval. The value of the characteristic bending strength, fg,k, for alumino silicate float glass is 45 MPa, for drawn sheet and rolled glass 25 MPa. NOTE Methods of determination of the bending strength of glass are given in EN 1288-1, EN 1288-2, EN 1288-3, EN 1288-4 and EN 1288-5 (see [1], [2], [3], [4], [5]). Design of glass panes is covered by prEN 16612 (see [6]). 5.3 Designation of clear alumino silicate glass 5.3.1 General An alumino silicate glass product is designated as clear alumino silicate glass when it is not tinted and when the light transmittance of the glass
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