1、BRITISH STANDARD BS EN 1748-1-1:2004 Glass in building Special basic products Borosilicate glasses Part 1-1: Definition and general physical and mechanical properties The European Standard EN 1748-1-1:2004 has the status of a British Standard ICS 01.040.81; 81.040.20 BS EN 1748-1-1:2004 This British
2、 Standard, was published under the authority of the Standards Policy and Strategy Committee on 27 September 2004 BSI 27 September 2004 ISBN 0 580 44456 2 National foreword This British Standard is the official English language version of EN 1748-1-1:2004. It supersedes BS EN 1748-1:1998 which is wit
3、hdrawn. The UK participation in its preparation was entrusted by Technical Committee B/520, Glass and glazing in building, 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 subcomm
4、ittee can be obtained on request to its secretary. Cross-references The British Standards which implement international 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 “
5、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 lega
6、l obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries 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. Su
7、mmary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 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 CommentsEUROPEANSTANDARD
8、NORMEEUROPENNE EUROPISCHENORM EN174811 September2004 ICS01.040.81;81.040.20 SupersedesEN17481:1997 Englishversion GlassinbuildingSpecialbasicproductsBorosilicateglasses Part11:Definitionandgeneralphysicalandmechanical properties VerredanslaconstructionProduitsdebasespciaux VerresborosilicatesPartie1
9、1:Dfinitionsetproprits physiquesetmcaniquesgnrales GlasimBauwesenSpezielleBasiserzeugnisse BorosilicatglserTeil11:Definitionenundallgemeine physikalischeundmechanischeEigenschaften ThisEuropeanStandardwasapprovedbyCENon21June2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichs
10、tipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,
11、French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Ger
12、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
13、050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN174811:2004:EEN 1748-1-1:2004 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Chemical composition 6 4.1 Principal constituents .6 4.2 Tint
14、 6 5 Physical and mechanical characteristics6 5.1 General characteristics .6 5.2 Definition of clear borosilicate glass.7 5.2.1 Clear transparent borosilicate glass8 5.2.2 Clear translucent borosilicate glass8 5.3 Stability of physical and chemical characteristics.9 6 Dimensional requirements9 6.1 M
15、anufacturing dimensions .9 6.1.1 Stock sizes .9 6.1.2 Final cut sizes 9 6.2 Thickness .9 6.2.1 Tolerances 9 6.3 Length, width, squareness and tolerances.10 7 Quality requirements.11 7.1 Methods of observation and measurement 11 7.1.1 Optical faults 11 7.1.2 Visual faults12 7.2 Acceptance levels12 7.
16、2.1 Optical faults, spot faults, linear/extended faults.12 7.2.2 Edge defects for final cut sizes13 8 Designation 16 Bibliography 17 EN 1748-1-1:2004 (E) 3 Foreword This document (EN 1748-1-1:2004) has been prepared by Technical Committee CEN /TC 129 “Glass in building“, the secretariat of which is
17、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.
18、 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 conf
19、ormity/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, Ir
20、eland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 1748-1-1:2004 (E) 4 1 Scope This document defines and classifies borosilicate glasses for use in building. It indicates their chemical comp
21、osition, 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
22、dimension less than 100 mm or a surface area less than 0,05 m. 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
23、 (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 oxid
24、e. 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 o
25、n 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 borosilic
26、ate 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 Fi
27、gure 1, except for cast borosilicate glass which does not have a direction of draw. EN 1748-1-1:2004 (E) 5 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
28、 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 v
29、isual 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 obta
30、ined 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 si
31、ze 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. EN 1748-1-1:2004 (E) 6 4 Chemical composition 4.1 Principal constituents The magnitude of the proportions by m
32、ass of the principal constituents of all the borosilicate glass products covered by this standard is as follows: Silicon Dioxide SiO 270 % to 87 % Boron Oxide B 2 O 37 % to 15 % Sodium Oxide Na 2 O 0 % to 8 % Potassium Oxide K 2 O 0 % to 8 % Aluminium Oxide Al 2 O 30 % to 8 % Others 0 % to 8 % 4.2 T
33、int 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 val
34、ues, 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 1748-1-1:2004 (E) 7 Table 1 Physical and mechanic
35、al characteristics of borosilicate glass Characteristic Symbol Value and unit Density (at 18 o C) 2200 kg/m 3to 2500 kg/m 3Hardness (Knoop) HK 0,1/20 4,5 to 6 GPa Youngs modulus (modulus of elasticity) E 6 x 10 10Pa to 7 x 10 10Pa Poissons ratio 0,2 Characteristic bending strength f g,k 45 x 10 6 Pa
36、 1Specific heat capacity c p 0,8 x 10 3J/(kg * K) Nominal value of average coefficient of linear expansion between 20 o C and 300 o C 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
37、 80 K 2Thermal conductivity 1 W/(m * K) Mean refractive index to visible radiation (380 nm to 780 nm) n 1,5 Emissivity (corrected) 0,837 1A design method will be made available from TC 129 WG8 (prEN 13473) 2Generally accepted value that is influenced by edge quality and glass type 5.2 Definition of
38、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 w
39、ith 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
40、 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 is define
41、d as a glass which is not tinted and which has, after any necessary pre-treatment, a minimum light transmittance according to 5.2.1 and 5.2.2. NOTE: The values given in 5.2.1 and 5.2.2 are not suitable for design. They are values used only for the definition of clear glass and exclude the effects of
42、 coatings and of surface roughness. The values of light transmittance used for design could be obtained from the glass manufacturer. They are determined in accordance with EN 410. EN 1748-1-1:2004 (E) 8 5.2.1 Clear transparent borosilicate glass A transparent glass product is defined as clear glass
43、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 2 for the nominal thickness of the glass product. NOTE: The limiting value given in Table 2 is
44、 applicable 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 defining a transparent glass product as clear glass Nominal thickness in mm Minimum value 3 - 5 6 -
45、8 9 and 10 11 12 and 13 15 0,90 0,89 0,88 0,87 0,86 0,84 5.2.2 Clear translucent borosilicate glass A translucent glass product is defined 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
46、 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 pre-treatment. Table 3 Minimum light transmittance values for defining a trans
47、lucent glass product as clear glass Thickness in mm Minimum value 3 4 5 6 and 6,5 7,5 and 8 9 and 10 0,83 0,82 0,81 0,80 0,78 0,76 EN 1748-1-1:2004 (E) 9 5.3 Stability of physical and chemical characteristics For borosilicate glass products, the physical and chemical characteristics can be considere
48、d 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 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. 6 Dimensional requirements 6.1 Manufacturing dimensions 6.1.1 Stock sizes Glass delivered in the following size range: Nominal length
