1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 572-2:2012Glass in building Basic sodalime silicate glass productsPart 2: Float glassBS EN 572-2:2012 BRITISH STANDARDNational forewordThis British Standard is the UK imple
2、mentation of EN 572-2:2012. Itsupersedes BS EN 572-2:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/520/1, Basic and transformed glass products.A list of organizations represented on this committee can beobtained on request to its secretary.This
3、 publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 76524 7ICS 81.040.20Compliance with a British Standard cannot confer immu
4、nity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2012.Amendments issued since publicationDate Text affectedBS EN 572-2:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 572-2 July 2012 ICS 81.040.20 Sup
5、ersedes EN 572-2:2004English Version Glass in building - Basic soda lime silicate glass products - Part 2: Float glass Verre dans la construction - Produits de base : verre de silicate sodo-calcique - Partie 2: Glace Glas im Bauwesen - Basiserzeugnisse aus Kalk-Natronsilicatglas - Teil 2: Floatglas
6、This European Standard was approved by CEN on 11 May 2012. 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 referen
7、ces concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 m
8、ember into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
9、France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHE
10、S KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 572-2:2012: EBS EN 572-2:2012EN 572-2:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references
11、 43 Terms and definitions .44 Dimensional requirements 54.1 Thickness .54.1.1 General 54.1.2 Tolerances 64.2 Length, width and squareness .65 Quality requirements .75.1 General 75.2 Methods of observation and measurement 75.2.1 Optical faults 75.2.2 Visual faults 85.3 Acceptance levels 95.3.1 Optica
12、l faults 95.3.2 Spot faults 96 Designation . 10Annex A (normative) Method for measuring spot fault size (including halo) 11A.1 Conditions of observation . 11A.2 Measurement of the size of the spot fault including the halo 12Bibliography . 14BS EN 572-2:2012EN 572-2:2012 (E) 3 Foreword This document
13、(EN 572-2:2012) has been prepared by Technical Committee CEN/TC 129 “Glass in building”, the secretariat of which is held by NBN. 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 January 2013, and
14、conflicting national standards shall be withdrawn at the latest by January 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This
15、document supersedes EN 572-2:2004. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This edition is a revision of EN 572-2:2004. The main changes in this edition are: a) an enlargement of the scope to oversize plates;, b
16、) a new method of determination of squareness;, c) a new method of measurement for spot fault (including halo) and an adaptation of the related requirements. This European Standard “Glass in building Basic soda lime silicate glass products” consists of the following parts: Part 1: Definitions and ge
17、neral physical and mechanical properties; Part 2: Float glass; Part 3: Polished wired glass; Part 4: Drawn sheet glass; Part 5: Patterned glass; Part 6: Wired patterned glass; Part 7: Wired or unwired channel shaped glass; Part 8: Supplied and final cut sizes; Part 9: Evaluation of conformity/Produc
18、t standard. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
19、 France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 572-2:2012EN 572-2:2012 (E) 4 1 Scope This European Standard specifie
20、s dimensional and minimum quality requirements (in respect of optical and visual faults) for float glass, as defined in EN 572-1:2012, for use in building. This European Standard applies only to float glass supplied in jumbo sizes (see Note 1), split sizes (see Note 2) and oversize plates (see Note
21、3). NOTE 1 Jumbo sizes PLF (plateau largeur de fabrication) Bandmasse. NOTE 2 Split sizes DLF (dimension largeur de fabrication) Geteilte Bandmasse. NOTE 3 Oversize plates these are plates where the nominal length, H, is greater than 6 000 mm. These plates are produced to special order. EN 572-8 giv
22、es information on float glass in sizes (i.e. supplied and final cut sizes) other than those covered by this European Standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated referen
23、ces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 572-1:2012, Glass in building Basic soda lime silicate glass products Part 1: Definitions and general physical and mechanical properties 3 Terms and defin
24、itions For the purposes of this document, the terms and definitions given in EN 572-1:2012 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 Key 1 direction of draw Figure 1 Relationship between length,
25、 width and direction of draw BS EN 572-2:2012EN 572-2:2012 (E) 5 3.2 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 1 to entry: The usual width is 3 210 mm. Exceptional production requirements can cause this to be
26、reduced but the nominal width is never less than 3 150 mm. 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 1 to entry: The usual width is 3 210 mm. Exceptional production requirements can cause this to be reduced bu
27、t the nominal width is never less than 3 150 mm. 3.4 optical fault fault which leads to distortions in the appearance of objects observed through the glass 3.5 visual fault fault which alters the visual quality of the glass Note 1 to entry: Visual faults include spot faults and linear/extended fault
28、s. 3.6 spot fault nucleus which is generally accompanied by a halo of distorted glass Note 1 to entry: Spot faults can be solid inclusions, bubbles, etc. 3.7 halo area locally distorted, generally around a point defect 3.8 linear/extended faults faults which can be on or in the glass, in the form of
29、 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 side. Measurement shall be by means of an instrume
30、nt of the calliper micrometer type. BS EN 572-2:2012EN 572-2:2012 (E) 6 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. Table 1 Tolerances on nominal thickness Dimensions in millimetres Nomi
31、nal thickness Tolerances 2 0,23 0,24 0,25 0,26 0,28 0,310 0,312 0,315 0,519 1,025 1,04.2 Length, width and squareness The tolerances on nominal dimensions length, H, and width, B, are 5 mm. The limits of squareness are described by the difference between diagonals. Such limits are given in Table 2.
32、Table 2 Limit on the difference between diagonals Dimensions in millimetres Nominal glass thickness, d Limit on the difference between diagonals Jumbo sizes Splits (H, B) 1 500 1 500 3 000 2, 3, 4, 5, 6 10 3 4 5 8, 10, 12 10 4 5 6 15, 19, 25 10 5 6 8 For oversize plates, the manufacturer shall be co
33、nsulted for tolerances on dimensions and on the difference between diagonals. BS EN 572-2:2012EN 572-2:2012 (E) 7 5 Quality requirements 5.1 General One quality level is considered in this European Standard. This is determined by the evaluation of optical and visual faults. The manufacturer(s) shall
34、 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 between 1 500 mm 1 150 mm and 2 500 mm 2 0
35、00 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 be between 400 lx and 1 200 lx. The me
36、asurement 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 frame. The centre of the glass shall be at
37、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 angles, , formed by the glass and the scree
38、n should be indicated (see Figure 2). 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 = 90 until there is no longer any distortions of the lines on the screen. The angle, (s
39、ee Figure 2), 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 a width of approximately 800 mm. The distortion is measured in zone D and zone d as shown in Figure 3. BS EN 572-2
40、:2012EN 572-2:2012 (E) 8 Key A screen B glass sample C observer Figure 2 Plan view showing set up of zebra test Figure 3 Zones for the measurement of optical distortion 5.2.2 Visual faults 5.2.2.1 Spot faults A spot fault consists of a nucleus generally accompanied by a halo. The categories of spot
41、faults are defined by the maximum dimension of the spot fault, measured according to the method defined in Annex A. The BS EN 572-2:2012EN 572-2:2012 (E) 9 dimension of the spot fault is the dimension of the halo or, in case of absence of halo, the dimension of the nucleus. Note the number of spot f
42、aults and the biggest dimension of the halo generated by the nucleus and relate to the four categories of spot faults as shown in Table 3. Table 3 Categories of spot faults Dimensions in millimetres Category Dimension of spot fault A 0,6 and 1,5 B 1,5 and 3,0 C 3,0 and 9,0 D 9,05.2.2.2 Linear/extend
43、ed faults The glass pane to be examined is illuminated in conditions approximating to diffuse daylight and is observed in front of a matt 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 th
44、e point of observation 2 m from the glass, keeping the direction of observation normal to the glass surface. View the pane of glass, and note the presence of visually disturbing faults. 5.3 Acceptance levels 5.3.1 Optical faults When viewed under the conditions of observation as described in 5.2.1,
45、the angle, , at which there is no disturbing distortion shall be not less than the appropriate critical viewing angle given in Table 4. Table 4 Critical viewing angles Nominal glass thickness Angle in zone D Angle in zone d mm degrees degrees2 45 403 and greater 50 45 5.3.2 Spot faults 5.3.2.1 Jumbo
46、 sizes The allowable numbers of the categories of faults (see Table 3) are shown in Table 5. BS EN 572-2:2012EN 572-2:2012 (E) 10 Table 5 Acceptance levels for spot faults in jumbo sizes Category of fault Average per pane Maximum in any pane A any number any number B 3 5 C 0,6 1 D 0,05 1, but faults
47、 that cause breakage are not allowed NOTE The word “average“ is intended to indicate a cumulative average over at least 20 tons of glass. 5.3.2.2 Split sizes The allowable numbers of the categories of faults (see Table 3) are shown in Table 6. Table 6 Acceptance levels for spot faults in split sizes
48、 Category of fault Average per 20 m Maximum 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 t of glass. For oversize plates, the manufacturer shall be cons
49、ulted regarding the allowable number of faults. 5.3.3 Linear/extended faults The allowable number of faults is an average of 0,05 faults in 20 m of glass, related to at least 20 tons. 6 Designation Float glass in compliance with this European Standard shall be designated respectively by type, reference to this European Standard, tint (manufacturers reference) or clear, nominal thickness, in mm, nominal length, H, and w
