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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1748-1 : 1998 The E
2、uropean Standard EN 1748-1 : 1997 has the status of a British Standard. ICS 81.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Glass in building Special basic products Part 1. Borosilicate glasses Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:25:52 GMT+00:00
3、 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 January 1998 BSI 1998 ISBN 0 580 28953 2 BS EN 1748-1 : 1998
4、Amendments issued since publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 1748-1 : 1997. The UK participation in its preparation was entrusted by Technical Committee B/520, Glass and glazing in building, to Subcommittee B/520/1, Basic
5、 and transformed glass products, which has the responsibility to: 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 Euro
6、pean developments and promulgate them in the UK. A list of organizations represented on this committee 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 Stand
7、ards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fr
8、ont cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:25:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isc
9、hes Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1748-1 : 1997 E EUROPEAN STANDARDEN 1748-1 NORME EUROPE ENNE EUROPA ISCHE NORM August 1997 ICS 8
10、1.040.20 Descriptors: Construction, glass, glassware, borosilicate glass, definitions, chemical composition, mechanical properties, physical properties, dimensions, dimensional tolerances, classifications, defects, acceptability, designation English version Glass in building Special basic products P
11、art1: Borosilicate glasses Verre dans la construction Produits de base spe ciaux Partie 1 : Verres borosilicates Glas im Bauwesen Spezielle Basiserzeugnisse Teil 1 : Borosilicatgla ser This European Standard was approved by CEN on 1997-07-24. CEN members are bound to comply with the CEN/CENELEC Inte
12、rnal 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 membe
13、r. 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
14、are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:25:52 GMT+00:
15、00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 1748-1 : 1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/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 pub
16、lication of an identical text or by endorsement, at the latest by February 1998, and conflicting national standards shall be withdrawn at the latest by February 1998. This European Standard consists of the following parts, under the general title Glass in building Special basic products: Part 1 : Bo
17、rosilicate glasses Part 2 : Glass ceramics Part 3 : Evaluation of conformity of borosilicate glasses and glass ceramics. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
18、 Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Chemical composition4 4.1Principal constituents4 4.
19、2Tint4 5Physical and mechanical characteristics4 5.1General characteristics4 5.2Definition of clear borosilicate glass4 5.3Stability of physical and chemical characteristics5 6Dimensional requirements6 6.1Thickness and tolerances6 6.2Length, width, squareness and tolerances6 7Quality requirements7 7
20、.1Classification7 7.2Faults7 7.3Methods of observation and measurement7 7.4Acceptance levels7 8Designation8 Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:25:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 1748-1 : 1997 BSI 1998 1 Direction of draw Figure 1. Relationship of length
21、, width and direction of draw 1 Scope This European Standard defines and classifies borosilicate 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 faults). This
22、 standard applies only to borosilicate glasses supplied in stock sizes. This standard does not apply to borosilicate glasses supplied in cut sizes for final end use. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These no
23、rmative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated re
24、ferences, the latest edition of the publication referred to applies. prEN 410Glass in building Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing characteristics 3 Definitions For the purposes of this Euro
25、pean Standard, the following definitions apply. 3.1 borosilicate glass Silicate glass containing between 7 % and 15 % boron oxide. 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, cle
26、ar or tinted borosilicate glass having parallel and polished faces which can be manufactured by continuous casting and flotation on a metal bath. 3.3 drawn sheet borosilicate glass Flat, transparent, clear or tinted borosilicate glass obtained by continuous drawing, initially vertically, of a regula
27、r thickness and with two surfaces fire polished. 3.4 rolled borosilicate glass Flat, transparent or translucent, clear or tinted borosilicate glass obtained by rolling. 3.5 cast borosilicate glass Flat, translucent, clear or tinted borosilicate glass obtained by casting. 3.6 nominal length, H Pane l
28、ength defined with reference to the direction of draw of the glass ribbon as shown in figure 1, except for cast borosilicate glass which does not have a direction of draw. 3.7 nominal width, B Pane width defined with reference to the direction of draw of the glass ribbon as shown in figure 1, except
29、 for cast borosilicate glass which does not have a direction of draw. 3.8 stock sizes Glass delivered in the following size range: Nominal length H: 500 mm to 3300 mm; Nominal width B: 500 mm to 2300 mm. 3.9 concentration, c The sum of the lengths of gaseous inclusions greater than 1,0 mm in any cir
30、cle of 400 mm diameter. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:25:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 1748-1 : 1997 BSI 1998 4 Chemical composition 4.1 Principal constituents The magnitude of the proportions by mass of the principal constituents of all the boro
31、silicate glass products covered by this standard is as follows: Silicon dioxideSiO270 % to 87 % Boron oxideB2O37 % to 15 % Sodium oxideNa2O0 % to 8 % Potassium oxideK2O0 % to 8 % Aluminium oxideAl2O30 % to 8 % Others0 % to 8 % 4.2 Tint Body tinted glass is obtained by the addition of suitable materi
32、als. 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 values, for normal annealed glass without any further toughening, are n
33、ot 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 1. Physical and mechanical characteristics of borosilicate glass CharacteristicSymbolValue and unit Density (at 18
34、 C)r2200 kg/m3 to 2500 kg/m3 Hardness (Knoop)HK0,1/20450 to 600 Youngs modulus (modulus of elasticity) E6 3 1010Pa to 7 3 1010Pa Poissons ratiom0,2 Specific heat capacity cp0,8 3 103J/(kgK) Nominal value of average coefficient of linear expansion between 20 C and 300 C aClass 1: (3,1 to 4,0) 3 1026/
35、K Class 2: (4,1 to 5,0) 3 1026/K Class 3: (5,1 to 6,0) 3 1026/K Thermal conductivity l1 W/(mK) Mean refractive index to visible radiation (380 nm to 780 nm) n1,5 5.2 Definition of clear borosilicate glass A borosilicate glass product is defined as clear borosilicate glass when it is not tinted and w
36、hen 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 with 5.2.1 and 5.2.2. In order to measure the light transmittance characteristics of glass, to determine whether it can b
37、e designated as 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 thickne
38、ss 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 defined as a glass which is not tinted and which has, after any necessary pretreatment, a minimum light transmittance according
39、 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 coatings and of surface roughness. The values of light transmittance used for design could be obtained from the glass man
40、ufacturer. They are determined in accordance with prEN 410. 5.2.1 Clear transparent glass A transparent glass product is defined as clear glass when it is not tinted and when its light transmittance, after any necessary pretreatment, measured according to prEN 410, and rounded to the nearest 0,01, i
41、s 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 applicable provided that the measured thickness of the glass product is within the allowable tolerances for the nominal thickness of that glass product.
42、Table 2. Minimum light transmittance values for defining a transparent glass product as clear glass Nominal thickness in mmMinimum value 30,90 40,90 50,90 60,89 70,89 80,89 100,88 120,86 150,84 Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 05:25:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
43、 Page 5 EN 1748-1 : 1997 BSI 1998 5.2.2 Clear translucent glass A translucent glass product is defined as clear glass when it is not tinted and when its light transmittance, after any necessary pretreatment, measured according to prEN 410, and rounded to the nearest 0,01, is greater than or equal to
44、 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 defining a translucent glass product as clear glas
45、s Thickness in mmMinimum value 30,83 40,82 50,81 60,80 70,79 80,78 100,76 5.3 Stability of physical and chemical characteristics For borosilicate glass products, the physical and chemical characteristics can be considered as remaining constant over time. a) Since glass is insensitive to photochemica
46、l 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. Licensed Copy: sheffieldun sheffieldun, n
47、a, Mon Oct 30 05:25:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 1748-1 : 1997 BSI 1998 Figure 2. Determination of length, width and squareness 6 Dimensional requirements 6.1 Thickness and tolerances The actual thickness shall be the average of four measurements, taken to the nearest 0,01
48、 mm, one taken at the centre of each side. Measurement shall be made by means of an instrument of the plate gauge type with a diameter of 50 mm5 mm. The actual thickness, rounded to the nearest 0,1 mm shall not vary from the nominal thickness by more than the tolerances shown in table 4. Table 4. To
49、lerances on nominal thicknesses Nominal thickness in mmLimit deviations in mm 320,4/+0,5 420,4/+0,5 520,4/+0,5 620,4/+0,5 720,4/+0,5 820,4/+0,5 1020,9/+1,0 1220,9/+1,0 1520,9/+1,0 6.2 Length, width, squareness and tolerances The nominal dimensions for the length, H, and width, B, being given the pane shall not be larger than a prescribed rectangle resulting from the nominal dimensions increased by the upper limit deviation, t, or smaller than a prescribed rectangle resulting from the nominal dimensions reduced by the