1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 0-626-18453-3 SANS 50572-2:2006Edition 2 EN 572-2:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Glass in building Basic soda lime silicate glass prod
4、ucts Part 2: Float glass This national standard is the identical implementation of EN 572-2:2004 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012
5、344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 50572-2:2006 Edition 2 EN 572-2:2004 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA SC 5120.61C, Construction standards Glazing m
6、aterials in buildings, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This part of SANS 50572 was published in December 2006. This SANS edition cancels and replaces the first SABS edition (SABS EN 572-2:1994). EUROPEAN STANDARDNORME EURO
7、PENNEEUROPISCHE NORMEN 572-2June 2004ICS 81.040.20 Supersedes EN 572-2:1994English versionGlass in Building - Basic soda lime slicate glass products - Part2: Float glassVerre dans la construction - Produits de base : verre desilicate sodocalcique - Partie 2: GlaceGlas im Bauwesen - Basiserzeugnisse
8、aus Kalk-Natronsilicatglas - Teil 2: FloatglasThis 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 EuropeanStandard the status of a national standard without any alteration.
9、 Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationund
10、er the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Icela
11、nd, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B
12、-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 572-2:2004: ESANS 50572-2:2006This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 572-2:2004 (E) 2 Contents
13、page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions4 4 Dimensional requirements5 4.1 Thickness5 4.1.1 General5 4.1.2 Tolerances 5 4.2 Length, width and squareness .6 4.2.2 Tolerances 6 5 Quality requirements .7 5.1 General7 5.2 Methods of observation and measurement 7 5.2.1 Opt
14、ical faults 7 5.2.2 Visual faults7 5.3 Acceptance levels8 5.3.1 Optical faults 8 5.3.2 Spot faults.9 5.3.3 Linear/extended faults.9 6 Designation.9 Bibliography 10 SANS 50572-2:2006This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 572-2:2004
15、 (E) 3 Foreword This document (EN 572-2:2004) 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 publication of an identical text or by endorsement, at th
16、e latest by December 2004, and conflicting national standards shall be withdrawn at the latest by December 2004. This document supersedes EN 572-2:1994. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essen
17、tial requirements of EU Directive(s). This European Standard “Glass in building Basic soda lime silicate glass products” consists of the following parts: EN 572-1 Definitions and general physical and mechanical properties EN 572-2 Float glass EN 572-3 Polished wired glass EN 572-4 Drawn sheet glass
18、EN 572-5 Patterned glass EN 572-6 Wired patterned glass EN 572-7 Wired or unwired channel shaped glass EN 572-8 Supplied and final cut sizes EN 572-9 Evaluation of conformity/Product standard According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following cou
19、ntries 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, Switze
20、rland and United Kingdom. SANS 50572-2:2006This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 572-2:2004 (E) 4 1 Scope This Part of this European Standard specifies dimensional and minimum quality requirements (in respect of optical and visua
21、l faults) for float glass, as defined in EN 572-1, for use in building. This Part of this standard applies only to float glass supplied in jumbo sizes (see note 1) and split sizes (see note 2). NOTE 1 Jumbo sizes PLF (plateau largeur de fabrication) Bandmasse. NOTE 2 Split sizes DLF (dimension large
22、ur de fabrication) Geteilte Bandmasse. EN 572-8 gives information on float glass in sizes other than those covered by this Part. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For
23、 undated references, the latest edition of the referenced document (including any amendments) applies. EN 572-1:2004, Glass in building Basic soda lime silicate glass products Part 1: Definitions and general physical and mechanical properties. 3 Terms and definitions For the purposes of this Europea
24、n Standard, the terms and definitions given in EN 572-1:2004 and the following apply. 3.1 length, H, and width, B 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 Key direction of draw 3.2
25、 jumbo sizes glass delivered in the following sizes: Nominal length H: 4 500 mm, 5 100 mm or 6 000 mm Nominal width B: 3 210 mm NOTE The usual width is 3 210 mm. Exceptional production requirements can cause this to be reduced but the nominal width is never below 3 150 mm SANS 50572-2:2006This s tan
26、dard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 572-2:2004 (E) 5 3.3 split sizes glass delivered in the following size ranges: Nominal length H: 1 000 mm to 2 550 mm Nominal width B: 3 210 mm NOTE The usual width is 3 210 mm. Exceptional production
27、requirements can cause this to be reduced but the nominal width is never below 3150 mm. 3.4 optical faults faults, which lead to distortions in the appearance of objects observed through the glass 3.5 visual faults faults, which alter the visual quality of the glass. They are spot faults and linear/
28、extended faults 3.6 spot fault 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 nucleus by a factor of approximately 3 3.7 linear/extended faults faults
29、 which can be on or in the glass, in the form of deposits, marks or scratches that occupy an extended length or area 4 Dimensional requirements 4.1 Thickness 4.1.1 General The actual thickness shall be the average of four measurements, taken to the nearest 0,01 mm, one taken at the centre of each si
30、de. Measurement shall be by means of an instrument of the calliper micrometer type. 4.1.2 Tolerances 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 1. SANS 50572-2:2006This s tandard may only be used and printe
31、d by approved subscription and freemailing clients of the SABS .EN 572-2:2004 (E) 6 Table 1 Tolerances on nominal thickness Nominal thickness (mm) Tolerances (mm) 2 0,2 3 0,2 4 0,2 5 0,2 6 0,2 8 0,3 10 0,3 12 0,3 15 0,5 19 1,0 25 1,0 4.2 Length, width and squareness Figure 2 Determination of length,
32、 width and squareness 4.2.1 The nominal dimensions for 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 permissible plus tolerance or smaller than a prescribed rectangle reduced by the permissible mi
33、nus tolerance. 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. 4.2.2 Tolerances The tolerances on nominal dimensions length, H, and width, B,
34、 are 5 mm. SANS 50572-2:2006This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 572-2:2004 (E) 7 5 Quality requirements 5.1 General One quality level is considered in this standard. This is determined by evaluation of the optical and visual fa
35、ults. NOTE The manufacturer(s) should be consulted if higher levels of quality are required. 5.2 Methods of observation and measurement 5.2.1 Optical faults A screen bearing an assembly of black and white stripes (zebra) is observed through the glass to be examined. The usual size of screen is betwe
36、en 1 500 mm 1 150 mm and 2 500 mm 2 000 mm. It consists of a translucent white background with parallel black stripes, 25 mm wide and 25 mm apart, inclined at 45. The screen is uniformly lit from behind with white daylight fluorescent tubes. The illuminance of the screen measured 1 m from it shall b
37、e between 400 lux and 1 200 lux. The measurement shall be taken at a point on a line normal to the centre of the screen. The walls of the test room should be painted with a dark non-reflective paint having a diffuse reflection 0,10. The glass to be examined shall be held vertically in a support fram
38、e. The centre of the glass shall be at a distance of 4,5 m from the screen and on a line normal to the centre of the screen. The glass shall be capable of being rotated around a vertical axis. The glass shall be held with the direction of draw of the glass vertical. Appropriate critical viewing angl
39、es, , formed by the glass and the screen should be indicated (see Figure 3). The observer stands still at a distance of 9 m from the centre of the screen on a line passing through the axis of rotation. The glass being examined is rotated from an angle a = 90 until there is no longer any distortions
40、of the lines on the screen. The angle, a (see Figure 3), at which this occurred is noted. The glass sample taken, with a length, H, between 300 mm and 500 mm and a width, B, of 3 210 mm, is split into four. This gives samples of width approximately 800 mm. The distortion is measured in the areas D a
41、nd d as shown in Figure 4. 5.2.2 Visual faults 5.2.2.1 Spot faults Measure the largest dimension (diameter or length) of these faults with a micrometer with graduations in tenths of a millimetre. Note the number and dimensions of the spot faults and relate to the four categories of spot faults as sh
42、own in Table 2. Table 2 Categories of spot faults Category Dimension of nuclei of spot faults (mm)A 0,2 and 0,5B 0,5 and 1,0 C 1,0 and 3,0 D 3,0 5.2.2.2 Linear/extended faults The glass pane to be examined is illuminated in conditions approximating to diffuse daylight and is observed in front of a m
43、att black screen (reflection coefficient between 0,2 and 0,4). Place the pane of glass to be examined vertically in front of the screen and parallel to it. Arrange the point of observation 2 m from the glass, keeping the direction of observation normal to the glass surface. View the pane of glass, a
44、nd note the presence of visually disturbing faults. SANS 50572-2:2006This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 572-2:2004 (E) 8 5.3 Acceptance levels 5.3.1 Optical faults When viewed under the conditions of observation as described i
45、n 5.2.1 the angle , at which there is no disturbing distortion shall be not less than the appropriate critical viewing angle given in Table 3. Table 3 Critical viewing angles Nominal glass thickness Angle a in zone D Angle a in zone d mm degrees degrees 2 45 40 3 and greater 50 45 Key A Screen B Gla
46、ss sample C Observer Figure 3 Plan view showing set up of zebra test Figure 4 Zones for the measurement of optical distortion SANS 50572-2:2006This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 572-2:2004 (E) 9 5.3.2 Spot faults 5.3.2.1 Jumbo
47、 sizes The allowable numbers of the categories of faults (see Table 2) are shown in Table 4. Table 4 Acceptance levels for spot faults in jumbo sizes Category of fault Average per pane Maximum in any pane A any number any numberB 3 5 C 0,6 1 D 0,05 1, but faults that cause breakage are not allowed N
48、OTE The word average is intended to indicate a cumulative average over at least 20 tonnes of glass. 5.3.2.2 Split sizes The allowable numbers of the categories of faults (see Table 2) are shown in Table 5. Table 5 Acceptance levels for spot faults in split sizes Category of fault Average per 20 m2 M
49、aximum in any pane A any number any number B 3 2 C 0,6 1 D 0,05 1, but faults that cause breakage are not allowed NOTE The word average is intended to indicate a cumulative average over at least 20 Tonnes of glass. 5.3.2.3 Linear/extended faults The allowable number of faults is an average 0,05 faults in 20 m2of glass, related to at least 20 tonnes. 6 Designation Float glass in compliance with this standard shall be designated respectively by: type; tint (manufacturers reference) or clear; nominal thi
