1、BRITISH STANDARD BS EN 14178-1:2004 Glass in building Basic alkaline earth silicate glass products Part 1: Float glass The European Standard EN 14178-1:2004 has the status of a British Standard ICS 81.040.20 BS EN 14178-1:2004 This British Standard was published under the authority of the Standards
2、Policy and Strategy Committee on 20 October 2004 BSI 20 October 2004 ISBN 0 580 44632 8 National foreword This British Standard is the official English language version of EN 14178-1:2004. The UK participation in its preparation was entrusted by Technical Committee B/520, Glass and glazing in buildi
3、ng, to Subcommittee B/520/1, Glass and glazing in building 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-references The British Standards which implement international
4、 or European publications 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 i
5、nclude 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; present to the responsible international/European committee any en
6、quiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a bac
7、k cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN141781 October2004 ICS81.040.20 Englishversion GlassinbuildingBasicalkalineearthsilicat
8、eglassproducts Part1:Floatglass VerredanslaconstructionVerredesilicatealcalinoterreux debasePartie1:Glaceflotte GlasimBauwesenBasiserzeugnisseausErdalkali SilicatglasTeil1:Floatglas ThisEuropeanStandardwasapprovedbyCENon27May2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichs
9、tipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,
10、French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Ger
11、many,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1
12、050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN141781:2004:EEN 14178-1:2004 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Chemical composition 5 4.1 Principal constituents .5 4.2 Tint
13、6 5 Physical and mechanical characteristics6 5.1 General characteristics .6 5.2 Designation of clear alkaline earth silicate glass.7 5.3 Stability of physical and chemical characteristics.8 6 Dimensional requirements8 6.1 Thickness .8 6.1.1 Tolerances 8 6.2 Manufacturing dimensions .8 6.3 Length, wi
14、dth, and squareness 8 7 Quality Requirements9 7.1 Methods of observation and measurement 10 7.1.1 Optical faults 10 7.1.2 Visual faults11 7.2 Acceptance levels11 7.2.1 Optical faults 11 7.2.2 Spot faults 12 7.2.3 Linear / extended faults.13 7.2.4 Edge defects for final cut sizes14 8 Designation 15 B
15、ibliography 17 EN 14178-1:2004 (E) 3 Foreword This document (EN 14178-1:2004) has been prepared by Technical Committee CEN/TC TC 129 “Glass in building”, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an iden
16、tical text or by endorsement, at the latest by April 2005, and conflicting national standards shall be withdrawn at the latest by April 2005. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requir
17、ements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, B, C or D, which is an integral part of this document can be found in EN 14178-2. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound t
18、o 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 K
19、ingdom. EN 14178-1:2004 (E) 4 1 Scope This document defines and classifies basic alkaline earth silicate glasses 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 fault
20、s). This document applies to basic alkaline earth silicate glasses supplied in jumbo sizes, split sizes and final cut sizes. This document does not apply to final cut sizes having a dimension less than 100mm or a surface area less than 0,05m. 2 Normative references The following referenced documents
21、 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 gl
22、azing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 basic alkaline earth silicate glass flat, transparent, clear or tinted float glass with a chemical composition according to 4.1 of this document, having parallel and polished faces obtaine
23、d by continuous casting and floatation on a metal bath 3.2 length, H, and width, B these are defined with reference to the direction of draw of the float glass ribbon as shown in Figure 1 Figure 1 Relationship between length, width and direction of draw 3.3 jumbo sizes glass delivered in the followi
24、ng sizes: EN 14178-1:2004 (E) 5 Nominal length H: 4500 mm, 5100 mm or 6000 mm Nominal width B: 3210 mm NOTE The usual width is 3210 mm. Exceptional production requirements may cause this to be reduced but the nominal width is never below 3150 mm 3.4 split sizes glass delivered in the following size
25、ranges: Nominal length H: 1000 mm to 2550 mm Nominal width B: 3210 mm NOTE The usual width is 3210 mm. Exceptional production requirements may cause this to be reduced but the nominal width is never below 3150 mm. 3.5 final cut size pane of glass that has been cut down to the dimensions being requir
26、ed either for installation or processing into a final product e.g. insulating glass units, thermally toughened safety glass, of those dimensions 3.6 optical faults these are faults that lead to distortions in the appearance of objects observed trough the glass 3.7 visual faults faults, which alter t
27、he visual quality of the glass. They are spot faults and linear / extend faults 3.8 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 nucle
28、us by a factor of approximately 3 3.9 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 3.10 edge defects these defects can occur on the edge of a cut size piece in the form of entrant and emergent faul
29、ts and / or bevels 4 Chemical composition 4.1 Principal constituents The magnitude of the proportions by mass of the principal constituents of all the alkaline earth silicate glass products covered by this document is as follows: Silicon Dioxide SiO 255 - 70 % Calcium Oxide CaO 3 - 12% EN 14178-1:20
30、04 (E) 6 Potassium Oxide K 2 O 5- 14% Aluminium Oxide Al 2 O 30 - 15 % Zirconium Oxide ZrO 2 0 8 % Strontium Oxide SrO Barium Oxide BaO 1 15 % Others 0 10 % 4.2 Tint Body tinted glass is obtained by the addition of suitable materials. 5 Physical and mechanical characteristics 5.1 General characteris
31、tics Conventional numerical values for the physical and mechanical characteristics of basic alkaline earth silicate 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, bu
32、t are the generally accepted figures for use in calculations where a high degree of accuracy is not required. Table 1 General characteristic values of alkaline earth silicate glass Characteristic Symbol Value and unit Density (at 18 o C) 2700 kg/m 3Hardness (Knoop) HK 0,1/205 6 Gpa Youngs modulus (m
33、odulus of elasticity) E 7,7 x 10 10Pa Poissons ratio 0,2 Characteristic bending strength f g,k k k k45 x 10 6 Pa 1Specific heat capacity c p0,7 x 10 3J/(kg K) Nominal value of average coefficient of linear expansion between 20 o C and 300 o C 8 x10 -6 /K Resistance against temperature differential a
34、nd sudden temperature change 40 K 2Thermal conductivity 0,8 - 1,1 W/(m K) Mean refractive index to visible radiation (at 589,3 nm) n 1,5 EN 14178-1:2004 (E) 7 Corrected emissivity 0,837 1The characteristic bending strength has to be used in conjunction with the design method given in prEN 13474 2Gen
35、erally accepted value that is influenced by edge quality and glass type 5.2 Designation of clear alkaline earth silicate glass An earth alkaline silicate glass product is defined as clear alkaline earth silicate glass when it is not tinted and when the light transmittance of the glass material, unmo
36、dified by the possible presence of a coating: - after any necessary pre-treatment - measured according to EN 410 - rounded to the nearest 0,01 is greater than or equal to the value given in Table 2 for the nominal thickness of the alkaline earth silicate glass product. In order to measure the light
37、transmittance characteristics of alkaline earth silicate glass, to determine whether it can be classified as clear, 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 alkaline earth silicate glass
38、substrate. The light transmittance of an alkaline earth silicate glass substrate has to be measured with its surfaces in a polished condition. Table 2 Mean values for determining if a transparent alkaline earth silicate glass product is clear Nominal thickness in mm Mean value (1,2)2 3 4 5 6 8 10 12
39、 15 0,90 0,90 0,90 0,89 0,89 0,88 0,87 0,86 0,84 1)The limiting values given are applicable provided that the measured thickness of the alkaline earth silicate glass product is within the allowable tolerances for the nominal thickness of that product. 2)The values given are not suitable for design.
40、They are values used only for the definition of clear alkaline earth silicate glass and exclude the effects of coatings. The values of light transmittance used for design should be obtained from the glass manufacturer, measured according to EN 410. EN 14178-1:2004 (E) 8 5.3 Stability of physical and
41、 chemical characteristics For alkaline earth silicate glass products, the physical and chemical characteristics can be considered as remaining constant over time. a) Since glass is insensitive to photochemical effects, the spectral properties (transmissions of light and solar energy) of the basic ea
42、rth alkaline silicate glass products are not modified by direct or indirect solar radiation. b) The surface of 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 wa
43、ter 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 Dimensional requirements 6.1 Thickness The actual thickness sh
44、all be the average of four measurements, taken to the nearest 0,01 mm, one taken at the centre of each side. Measurement shall be made by means of an instrument of the caliper micrometer type. 6.1.1 Tolerances The actual thickness, rounded to the nearest 0,1 mm shall not vary from the nominal thickn
45、ess by more than the tolerances shown in Table 3. Table 3 Tolerances on nominal thickness Dimensions in mm Nominal thickness Tolerances 2 3 4 5 6 8 10 12 15 0,2 0,2 0,2 0,2 0,2 0,3 0,3 0,3 0,5 6.2 Manufacturing dimensions 6.3 Length, width, and squareness The nominal dimensions for the length, H, an
46、d width, B, being given the pane shall not be larger than a prescribed rectangle resulting from the nominal dimensions increased by the permissible plus tolerance, t, or smaller than a prescribed rectangle resulting from the nominal dimensions reduced by the permissible minus EN 14178-1:2004 (E) 9 t
47、olerance, t. The sides of the prescribed rectangles shall be parallel to one another and these rectangles shall have a common centre (see Figure 2). The limits of squareness shall also be prescribed by these rectangles. Figure 2 Determination of length, width and squareness The tolerance, t, on the
48、nominal dimensions length H and width B is given in Table 4. Table 4 Tolerance on the nominal dimensions length and width Dimensions in mm Tolerance t mm Final cut sizes Thickness Jumbo / split (H, B) 1500 1500 3000 2, 3, 4, 5, 6 5 1,5 2 3 8, 10, 12 5 1,5 2,5 4 15 5 2 3 4 7 Quality Requirements One quality level is considered in this document. This is determined by evaluation of the optical and visual faults. Optical faults are determined on the dimensions of glass as manufactured, i.e. jumbo o
