BS EN 572-1:2012+A1:2016 BSI Standards Publication Glass in building — Basic soda‑lime silicate glass products Part 1: Definitions and general physical and mechanical properties BS EN 572-1:2012+A1:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 572-1:2012+A1:2016 It supersedes BS EN 572-1:2012 which is withdrawn The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered by CEN amendment A1 is indicated by The UK participation in its preparation was entrusted by Technical Committee B/520, Glass and glazing in building, to Subcommittee B/520/1, Basic and transformed glass products A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2016 Published by BSI Standards Limited 2016 ISBN 978 580 89954 ICS 81.040.20 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2012 Amendments/corrigenda issued since publication Date Text affected 29 February 2016 Implementation of CEN amendment A1:2016 EN 572-1:2012+A1 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM February 2016 ICS 01.040.81; 81.040.20 Supersedes EN 572-1:2012 English Version Glass in building - Basic soda-lime silicate glass products Part 1: Definitions and general physical and mechanical properties Verre dans la construction - Produits de base : verre de silicate sodo-calcique - Partie : Définitions et propriétés physiques et mécaniques générales Glas im Bauwesen - Basiserzeugnisse aus KalkNatronsilicatglas - Teil 1: Definitionen und allgemeine physikalische und mechanische Eigenschaften This European Standard was approved by CEN on 11 May 2012 and includes Amendment approved by CEN on 22 November 2015 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 Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member This European Standard exists 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 EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 572-1:2012+A1:2016 E BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) Contents Page European foreword Scope Normative references Terms and definitions General principles 5.1 5.2 Chemical composition General Tint 6.1 6.2 6.3 6.3.1 6.3.2 6.3.3 6.4 6.5 6.5.1 6.5.2 Physical and mechanical characteristics General characteristics Characteristic bending strength (fg,kk) Designation of clear glass General Clear transparent glass Clear translucent glass Stability of physical and chemical characteristics 10 General quality criteria and their evaluation 10 Optical 10 Appearance 11 Annex A !(informative) Complementary information related to REACH" 12 Bibliography 13 BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) European foreword This document (EN 572-1:2012+A1:2016) 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 August 2016, and conflicting national standards shall be withdrawn at the latest by August 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 includes Amendment approved by CEN on 22 November 2015 This document supersedes !EN 572-1:2012" The start and finish of text introduced or altered by amendment is indicated in the text by tags !" This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association !EN 572-1:2012 was" a revision of EN 572-1:2004 The main changes in this edition !were": a) a better explanation of the characteristic bending strength of glass; b) an extension of the minimum light transmittance value for translucent glass up to 19 mm; c) the bibliography has been complemented This European Standard “Glass in building — Basic soda-lime silicate glass products” consists of the following parts: — Part 1: Definitions and general physical and mechanical properties; — Part 2: Float glass; — Part 3: Polished wired glass; — Part 4: Drawn sheet glass; — Part 5: Patterned glass; — Part 6: Wired patterned glass; — Part 7: Wired or unwired channel shaped glass; — Part 8: Supplied and final cut sizes; — Part 9: 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, Bulgaria, BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) 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 BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) Scope This Part of this European Standard specifies and classifies basic glass products and indicates their chemical composition, their main physical and mechanical characteristics and defines their general quality criteria Specific dimensions and dimensional tolerances, description of faults, quality limits and designation for each basic product type are not included in this Part, but are given in other Parts of EN 572 specific to each product type: — EN 572-2 — EN 572-3 — EN 572-4 — EN 572-5 — EN 572-6 — EN 572-7 — EN 572-8 — EN 572-9 Float glass; Polished wired glass; Drawn sheet glass; Patterned glass; Wired patterned glass; Wired or unwired channel shaped glass; Supplied and final cut sizes; Evaluation of conformity/Product standard 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 EN 572-2, Glass in building — Basic soda lime silicate glass products — Part 2: Float glass EN 572-3, Glass in building — Basic soda lime silicate glass products — Part 3: Polished wired 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 572-6, Glass in building — Basic soda lime silicate glass products — Part 6: Wired patterned glass EN 572-7, Glass in building — Basic soda lime silicate glass products — Part 7: Wired or unwired channel shaped glass EN 572-8, Glass in building — Basic soda-lime silicate glass products — Part 8: Supplied and final cut sizes EN 572-9, Glass in building — Basic soda lime silicate glass products — Part 9: Evaluation of conformity/Product standard ISO 9385, Glass and glass-ceramics — Knoop hardness test BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) Terms and definitions For the purposes of this document, the following terms and definitions apply 3.1 float flat, transparent, clear or tinted soda-lime silicate glass having parallel and polished faces obtained by continuous casting and floatation on a metal bath Note to entry: In French called ‘glace’ and in German ‘Floatglas’ 3.2 drawn sheet glass flat, transparent, clear or tinted soda-lime silicate glass obtained by continuous drawing, initially vertically, of a regular thickness and with the two surfaces fire polished Note to entry: Drawn sheet glass covers three products: new antique drawn sheet glass, drawn sheet glass for renovation and drawn sheet glass with minimum visual faults 3.3 patterned glass flat, translucent, clear or tinted soda-lime silicate glass obtained by continuous casting and rolling 3.4 wired patterned glass flat, translucent, clear or tinted soda-lime silicate glass obtained by continuous casting and rolling which has a steel mesh welded at all intersections incorporated in the glass during its manufacturing process Note to entry: Note to entry: The surfaces can be either patterned or plain In German, wired patterned glass with plain surfaces is called ‘Drahtglas’ 3.5 polished wired glass flat, transparent, clear soda-lime silicate glass having parallel and polished faces obtained by grinding and polishing the faces of wired patterned glass 3.6 wired or unwired channel-shaped glass translucent, clear or tinted soda-lime silicate glass, wired or unwired, obtained by continuous casting and rolling, which is formed into a U shape during the manufacturing process General principles EN 572-1 shall be read in conjunction with Parts to of this European Standard BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) Chemical composition 5.1 General !The basic glass products covered by this European Standard are all manufactured from soda-lime silicate glass The magnitude of the proportions by mass of the principal constituents of soda-lime silicate glass covered by this European Standard is given in Table 1; see also Annex A: Table — Magnitude of the proportions by mass of the constituents of soda-lime silicate glass Constituents Proportion by mass of element Silicon (Si) Calcium (Ca) Sodium (Na) Magnesium (Mg) Aluminium (Al) Othersa a 32 % – 35 % 3,5 % – 10,1% 7,4 % – 11,9% % – 3,7% % – 1,6% < 5% Properties other than photometric characteristics shall not be significantly altered by these other components " 5.2 Tint Body tinted glass is obtained by the addition of suitable materials Physical and mechanical characteristics 6.1 General characteristics Conventional numerical values for the physical and mechanical characteristics of basic soda-lime 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 BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) !Table 2" — General characteristic values of basic soda-lime silicate glass Characteristic Symbol Value and unit Density (at 18 °C) ρ 500 kg/m3 Young's modulus (modulus of elasticity) E Hardness (Knoop) HK0,1/20 Poisson's ratio μ × 1010 Pa cp α 0,72 × 103 J/(kg ⋅ K) Resistance against temperature differential and sudden temperature change Thermal conductivity λ 40 K b Mean refractive index to visible radiation (at 589,3 nm) Emissivity (corrected) n ε 1,5 Specific heat capacity Nominal value of average coefficient of linear expansion between 20 °C and 300 °C a b Knoop Hardness in accordance with ISO 9385 GPa a 0,2 × 10-6/K W/(m ⋅ K) 0,837 Generally accepted value that is influenced by edge quality and glass type 6.2 Characteristic bending strength (fg,kk) The characteristic bending strength value applies to quasi-static loading over a short time (e.g wind loading) and relate to a % probability of breakage at the lower limit of the 95 % confidence interval The value of the characteristic bending strength, fg,kk, for soda-lime silicate glass is 45 N/mm² NOTE Methods for the determination of the bending strength of glass are given in EN 1288 Parts to (see [1]) Design of glass panes is covered by prEN 13474 (see [6]) 6.3 Designation of clear glass 6.3.1 General A glass product is designated as clear glass when it is not tinted and when the light transmittance of the glass material, unmodified by the possible presence of a coating or surface roughness of, for example, a patterned glass, complies with 6.3.3 In order to measure the light transmittance characteristics of glass and to determine whether it can be designated as a clear glass, it is necessary, in some cases, to carry out a pre-treatment such as the following — Coatings on smooth surfaces shall be eliminated, without modifying the thickness of the glass substrate — Rough surfaces, with or without coatings, shall 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 NOTE The light transmittance values given in 6.3.2 and 6.3.3 are not suitable for design They are values used only for the designation of clear glass and exclude the effects of coatings and of surface roughness The values of BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) light transmittance used for design can be obtained from the glass manufacturer They are determined in accordance with EN 410 6.3.2 Clear transparent glass A transparent glass product shall be designated as clear glass when it is not tinted and when its light transmittance — after any necessary pre-treatment, — measured according to EN 410, and — rounded to the nearest 0,01, is greater than or equal to the value given in !Table 3" for the nominal thickness of the glass product NOTE The limiting value given in !Table 3" is appropriate, provided that the measured thickness of the glass product is within the allowable tolerances for the nominal thickness of that glass product !Table 3" — Minimum light transmittance values for designating a transparent glass product as clear glass Nominal thickness in mm Minimum value of light transmittance 0,89 0,87 10 12 15 19 25 6.3.3 Clear translucent glass 0,88 0,86 0,85 0,83 0,81 0,79 0,76 0,72 0,67 A translucent glass product shall be designated as clear glass when it is not tinted and when its light transmittance — after any necessary pre-treatment, — measured according to EN 410, and — rounded to the nearest 0,01, BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) is greater than or equal to the value obtained by linear interpolation from !Table 4", for the measured thickness of the specimen NOTE The limiting value will vary with the exact thickness of the specimen after its pre-treatment !Table 4" — Minimum light transmittance values for designating a translucent glass product as clear glass Thickness in mm Minimum value of light transmittance 0,83 0,81 10 12 14 15 19 6.4 Stability of physical and chemical characteristics 0,82 0,80 0,79 0,78 0,76 0,74 0,72 0,71 0,67 For basic soda-lime silicate glass products, the physical and chemical characteristics can be considered as remaining constant over time due to the following reasons a) Since glass is insensitive to photochemical effects, the spectral properties (transmission of light and solar energy) of the basic glass products are not modified by direct or indirect solar radiation b) The surface of the glass used in building is virtually insensitive to attack from the environment NOTE Whilst the surface of the glass when installed in a building is virtually insensitive to attack from water, care should be taken to protect the glass surface prior to installation Inappropriate storage can result in water/humidity being drawn up between glass sheets This concentrated environment can cause attack of the surface (see [7]) 6.5 General quality criteria and their evaluation 6.5.1 Optical This criterion concerns the visibility of objects observed through the glass and only applies to transparent glass products The main faults that can affect the optical quality are distortion of the surface and lack of homogeneity in the body of the glass The optical quality shall be evaluated by means of a visual observation method 10 BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) 6.5.2 Appearance This criterion concerns the appearance of the product The visual quality can be affected by the presence of spot faults (bubbles, stones, etc.), linear/extended faults (scuff marks, scratches, lines, deposits, impressions, etc.), pattern faults and wire faults Spot faults are evaluated by specifying numbers and dimensions Linear/extended faults are evaluated by visual observation Pattern faults and wire faults are evaluated by measuring deviation 11 BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) Annex A !(informative) Complementary information related to REACH Soda-lime silicate glass is an amorphous inorganic substance obtained from different inorganic raw materials which react at high temperature to form a new random network, where different elements are linked together, typically by oxygen bridges, arranged in such a way that no free oxides are present Under the REACH Regulation (Registration, Evaluation, Authorisation and Restriction of Chemicals Regulation (EC) No 1907/2006) glass is considered as a UVCB substance (substance of unknown or variable composition, complex reaction products or biological materials) NOTE Soda-lime silicate glass may benefit from exemption from the obligation to register in accordance with Article 2(7) (b) of REACH (Commission Regulation (EC) No 987/2008) NOTE Glass products covered by this standard are “articles” in accordance with Article 3(3) of REACH (Regulation (EC) No 1907/2006) Soda-lime silicate glass can better be identified by the chemical formula: NanCaoMgpAlq……SimOs where s = n/2 + o + p + q/2 + … + m 12 " BS EN 572-1:2012+A1:2016 EN 572-1:2012+A1:2016 (E) Bibliography [1] [2] [3] [4] [5] EN 1288-1, Glass in building — Determination of the bending strength of glass — Part 1: Fundamentals of testing glass EN 1288-2, Glass in building — Determination of the bending strength of glass — Part 2: Coaxial ring test on flat specimens with large test surface areas 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) EN 1288-4, Glass in building — Determination of the bending strength of glass — Part 4: Testing of channel shaped glass EN 1288-5, Glass in building — Determination of the bending strength of glass — Part 5: Coaxial ring test on flat specimens with small test surface areas [6] prEN 13474 (all parts), Glass in building — Design of glass panes — Determination of the load resistance of glass panes by calculation and testing [7] Evaluation of the relevant parameters allowing to prevent the weathering of float glass during storage, Franco Geotti-Bianchini, Martina Preo, Rivista della Stazione Sperimentale del Vetro n 3-1999, pages 127 - 146 13 This page deliberately left blank This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS 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