BRITISH STANDARD BS EN572-1:2004IncorporatingCorrigendum No. 1 Glass in building—Basic soda lime silicateglass products—Part1: Definitions and general physicaland mechanical propertiesThe European Standard EN 572-1:2004 has the status of aBritish StandardICS 01.040.81; 81.040.2012 &23<,1* :,7+287 %6, 3(50,66,21 (;&(37 $6 3(50,77(' %< &23<5,*+7 /$:BS EN 572-1:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on 1July 2004© BSI 8November 2004ISBN 0 580 43998 4National forewordThis British Standard is the official English language version of EN 572-1:2004, including Corrigendum September 2004. It supersedes BS EN 572-1:1995 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee B/520, Glass and glazing in building, to Subcommittee B/520/1, Basic and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, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or Europeanpublications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.—aid enquirers to understand the text;——monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publication Amd. No. Date Comments15411Corrigendum No. 18 November 2004Correction to Table 1EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORMEN 572-1June 2004ICS 81.040.20; 01.040.81Supersedes EN 572-1:1994English versionGlass in building - Basic soda lime silicate glass products - Part 1: Definitions and general physical and mechanical propertiesVerre dans la construction - Produits de base : verre de silicate sodo-calcique - Partie 1 : Définitions et propriétésphysiques et mécaniques généralesGlas im Bauwesen - Basiserzeugnisse aus Kalk-Natronsilicatglas - Teil 1: Definitionen und allgemeine physikalische und mechanische EigenschaftenThis European Standard was approved by CEN on 1 April 2004.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 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.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 STANDARDIZATION C O M I T É E U R O P ÉE N D E N O R M A LI S A T I O N C HES KOM ITEE FÜR NOR M UNG© 2004 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 572-1:2004: EIncorporating Corrigendum September 2004EN 572-1:2004 (E)2Contentspage2 Normative 3Terms and definitions (5)4 General principles..........................................................................................................................................5 5 Chemical composition ..................................................................................................................................6 5.1 General............................................................................................................................................................6 5.2 Tint ..................................................................................................................................................................6 6 Physical and mechanical characteristics....................................................................................................6 6.1 General characteristics.................................................................................................................................6 6.2 Designation of clear glass............................................................................................................................7 6.2.1 General............................................................................................................................................................7 6.2.2 Clear transparent glass.................................................................................................................................7 6.2.3 Clear translucent glass.................................................................................................................................8 6.3 Stability of physical and chemical characteristics.....................................................................................9 6.4 General quality criteria and their evaluation...............................................................................................9 6.4.1 Optical.............................................................................................................................................................9 6.4.2 Appearance ....................................................................................................................................................9 Bibliography.. (10)EN 572-1: 2004 (E)ForewordThis document (EN 572-1:2004) has been prepared by Technical Committee CEN/TC 129 "Glass in building", the secretariat of which is held by IBN.This document supersedes EN 572-1:1994.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 December 2004, and conflicting national standards shall be withdrawn at the latest by December 2004.This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).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.3EN 572-1:2004 (E)41 ScopeThis Part of this European Standard specifies and classifies basic glass products, indicates their chemical composition, their main physical and mechanical characteristics and defines their general quality criteria.EN 572-2 Float glassEN 572-3 Polished wired glass EN 572-4 Drawn sheet glass EN 572-5 Patterned glass EN 572-6 Wired patterned glassEN 572-7 Wired or unwired channel shaped glass EN 572-8 Supplied and final cut sizesEN 572-9Evaluation of conformity/Product standard2 Normative referencesThe 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 EN 572-2, Glass in building — Basic soda lime silicate glass products — Part 2: Float glassEN 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 glassEN 572-7, Glass in building — Basic soda lime silicate glass products — Part 7: Wired or unwired channel shaped glassEN 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 standardprEN 13474, Glass in building — Design of glass panesEN 572-1: 2004 (E)3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1floatflat, transparent, clear or tinted soda-lime silicate glass having parallel and polished faces obtained by continuous casting and floatation on a metal bathNOTE In French called ‘glace’ and in German ‘Floatglas’.3.2drawn sheet glassflat, transparent, clear or tinted soda-lime silicate glass obtained by continuous drawing, initially vertically, of a regular thickness and with the two surfaces fire polishedNOTE Drawn sheet glass covers three products; new antique drawn sheet glass, drawn sheet glass for renovation and drawn sheet glass with minimum visual faults.3.3patterned glassflat, translucent, clear or tinted soda-lime silicate glass obtained by continuous casting and rolling3.4wired patterned glassflat, 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. The surfaces may be either patterned or plainNOTE In German wired patterned glass with plain surfaces is called ‘Drahtglas’.3.5polished wired glassflat, transparent, clear soda-lime silicate glass having parallel and polished faces obtained by grinding and polishing the faces of wired patterned glass3.6wired or unwired channel-shaped glasstranslucent, 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 process4 General principlesEN 572-1 shall be read in conjunction with Parts 2 to 9 of this European Standard.5EN 572-1:2004 (E)65 Chemical composition5.1 GeneralThe basic glass products covered by this standard are all manufactured from soda-lime silicate glass.standard is as follows:69 % to 74 % Calcium oxide (CaO) 5 % to 14 % Sodium oxide (Na 2O) 10 % to 16 % Magnesium oxide (MgO) 0 % to 6 % Aluminium oxide (Al 2O 3) 0 % to 3 % Others0 % to 5 %In addition to the above general composition, these glasses may also contain small quantities of other substances.5.2 TintBody tinted glass is obtained by the addition of suitable materials.6 Physical and mechanical characteristics6.1 General characteristicsConventional numerical values for the physical and mechanical characteristics of basic glass 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.EN 572-1: 2004 (E)7Table 1 — General characteristic valuesCharacteristic SymbolNumerical value and unit Density (at 18 °C) ρ 2 500 kg/m3Hardness (Knoop) HK 0,1/20 6GpaYoung's modulus Ε7 × 1010Pa (modulus of elasticity)Poisson's ratioCharacteristic bending strength µf g,k 0,2 45 x 106PaaSpecific heat capacityC0,72 × 103 J/(kg ⋅K) Average coefficient of linear expansion between 20 °C and 300 °Cα 9 × 10-6K -1Resistance against temperature differential and sudden temperature changeThermal conductivityλ40 K b1 W/(m ⋅K) Mean refractive index to visible radiation (380 nm to 780 nm) N 1,5 Emissivity (corrected)ε0,837aThe characteristic bending strength shall be used in conjunction with the design method given in prEN 13474.bGenerally accepted value that is influenced by edge quality and glass type.6.2 Designation of clear glass6.2.1 GeneralA 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 5.2.2 and 5.2.3.In order to measure the light transmittance characteristics of glass, to determine whether it can be designated as a clear glass, it is necessary, in some cases, to carry out a pretreatment:— 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.NOTE The light transmittance values given in 5.2.2 and 5.2.3 are not suitable for design. They are values used only for the 6.2.2 Clear transparent glassA transparent glass product is designated as clear glass when it is not tinted and when its light transmittance:— after any necessary pretreatment; — measured according to EN 410; andEN 572-1:2004 (E)— rounded to the nearest 0,01;is greater than or equal to the value given in Table 2 for the nominal thickness of the glass product.NOTE The limiting value given in Table 2 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 2 — Minimum light transmittance values for designating6.2.3 Clear translucent glassA translucent glass product is designated as clear glass when it is not tinted and when its light transmittance:— after any necessary pretreatment;— measured according to EN 410; and— rounded to the nearest 0,01;is greater than or equal to the value obtained by linear interpolation from Table 3, for the measured thickness of the specimen.NOTE The limiting value will vary with the exact thickness of the specimen after its pretreatment.Table 3 — Minimum light transmittance values for designatinga translucent glass product as clear glassThickness in mm Minimum value of light transmittance3 0,834 0,825 0,816 0,807 0,798 0,7810 0,768EN 572-1: 2004 (E)6.3 Stability of physical and chemical characteristicsFor basic glass products, the physical and chemical characteristics can be considered as remaining constant over time.a) S ince glass is insensitive to photochemical effects, the spectral properties (transmission of light andsolar energy) of the basic glass products are not modified by direct or indirect solar radiation.b) T he 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 [1]).6.4 General quality criteria and their evaluation6.4.1 OpticalThis 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.6.4.2 AppearanceThis 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.9EN 572-1:2004 (E)Bibliography[1] Evaluation of the relevant parameters allowing to prevent the weathering of float glass during storageFranco Geotti-Bianchini, Martina PreoRivista della stazione Sperimentale del Vetro n. 3-1999, page 127 - 14610blankBS EN 572-1:2004BSI 389 Chiswick High Road LondonW4 4AL BSI —British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.Tel:+44+44(0)2089967400.BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:+44(0)2089969001. Fax:+44(0)2089967001. Email:orders@. Standards are also available from the BSI website at .In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:+44(0)2089967111. Fax:+44(0)2089967048. Email:info@.Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:+44(0)2089967002. Fax:+44(0)2089967001. Email:membership@.Information regarding online access to British Standards via British Standards Online can be found at /bsonline.Further information about BSI is available on the BSI website at .CopyrightCopyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI.This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.Details and advice can be obtained from the Copyright & Licensing Manager. Tel:+44(0)2089967070. Fax:+44(0)2089967553. Email:copyright@.。