1、BRITISH STANDARD BS AU 251:1994 Specification for Performance of automotive laminated windscreen repair systemsBSAU251:1994 This British Standard, having been prepared under the directionof the Automobile Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes int
2、oeffecton 15February1994 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference AUE/10 Draft for comment 92/77928 DC ISBN 0 580 22532 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Automobile
3、 Standards Policy Committee (AUE/-) to Technical Committee AUE/10, upon which the following bodies were represented: Association of British Glass Repair Operators Automobile Association British Plastics Federation British Railways Board Department of Transport Department of Transport (Transport Rese
4、arch Laboratory) Flat Glass Manufacturers Association Glass and Glazing Federation National Caravan Council Limited Society of Motor Manufacturers and Traders Limited Windscreen and Glass Repairers Association Windscreen Repair Equipment Manufacturers and Suppliers Association Amendments issued sinc
5、e publication Amd. No. Date CommentsBSAU251:1994 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Principal characteristics of a windscreen repair system 1 5 Categories of damage types 1 6 Test pieces 1 7 Testing 2 8 Perform
6、ance 3 9 Spectrometric analysis of windscreen resin repair materials 4 10 Marking and information 5 Annex A (normative) Method of test for resistance to humidity 6 Annex B (normative) Method of test for resistance to high temperature 6 Annex C (normative) Method of test for resistance to radiation 6
7、 Annex D (normative) Method of test for visual appearance before and after storage 6 Annex E (normative) Method of test for optical distortion 7 Annex F (normative) Method of test for light scatter 7 Annex G (normative) Method of test for impact resistance (2.26kg ball) 7 Annex H (normative) Method
8、of test for impact resistance (headform) 7 Annex J (normative) Three point bend test 8 Annex K (normative) Method for spectrometric analysis of windscreen resin repair material 8 Figure 1 Types of windscreen damage 2 Figure J.1 Example of method of supporting test pieces under load 9 Table 1 Schedul
9、e of tests and types of damage to be used for testing 3 List of references Inside back coverBSAU251:1994 ii BSI 09-1999 Foreword This British Standard has been prepared under the direction of the Automobile Standards Policy Committee. It is based on initial proposals from the Glass and Glazing Feder
10、ation and the Association of British Glass Repair Operators. There is a growing practice to repair minor impact damage to laminated windscreens using some form of plastics resin. Such repair, whilst not restoring a windscreen to its original condition in all respects, is advantageous since, if carri
11、ed out using the correct procedures, it can: a) improve the appearance of the damaged area and its optical quality; b) restore a smooth surface to the damaged area which might otherwise interfere with the performance of the windscreen wipers; c) prevent further deterioration, e.g.moisture ingress. T
12、he procedures to be followed for windscreen repairs are given in BSAU242:1991 Code of practice for automotive windscreen repair. This standard specifies the performance requirements for windscreen repair systems, including the materials used, when carrying out repairs in accordance with BSAU242:1991
13、. Performance of the system is specified in terms of the performance of repairs to test pieces with specified types of damage. The standard takes into account the requirements specified for glazing materials given in the Road Vehicle (Construction and Use) Regulations19861. Product certification. Us
14、ers of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing product surveillance which may be coupled with assessment of a suppliers quality systems against the appropriate Part of
15、 BS5750. Enquiries as to the availability of third party certification schemes are forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. A
16、British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a
17、front cover, an inside front cover, pages i and ii, pages1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSAU251:1994 BSI 09-1999 1 1
18、Scope This British Standard specifies performance requirements for windscreen repair systems, including the materials used, to be employed for the repair of laminated windscreens that have been damaged by impacts. This standard is applicable to repair systems to be used for the repair of windscreens
19、 of heavy goods vehicles (HGVs), coaches and passenger cars in accordance with BSAU242:1991. NOTEAttention is drawn to the Road Vehicle (Construction and Use) Regulations19861. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions o
20、f other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this British Standard only when incorporated in it by updating or r
21、evision. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Defini
22、tions For the purposes of this British Standard the following definitions apply. 3.1 windscreen repair system a specific procedure, apparatus and windscreen repair material designed for carrying out repair to an area of localized impact damage in a laminated glass windscreen 3.2 windscreen repair ma
23、terial a plastics resin material containing as its essential ingredient an organic substance of high molecular weight which is polymerized during the repair procedure to provide adhesive strength, and a colourless, weatherproof transparent filler 3.3 laminated glass windscreen a windscreen consistin
24、g of two or more layers of glass held together by one or more interlayers of plastics material 3.4 principal characteristic a characteristic that substantially changes the performance of the windscreen repair system and the trade name or mark of the manufacturer 3.5 flat windscreen a windscreen with
25、 no curvature 4 Principal characteristics of a windscreen repair system 4.1 A windscreen repair system shall be identified by its principal characteristics as listed in4.2. A change in any principal characteristic shall imply a new system. 4.2 The principal characteristics of a windscreen repair sys
26、tem shall be as follows: a) the trade name or mark of the manufacturer of the repair system; b) the apparatus used for repair; c) the chemical name of the repair material; d) the category of damage types which can be repaired (see clause5); e) the repair method and procedure specified by the manufac
27、turer. 5 Categories of damage types The type, size and location of damage which may be repaired shall be limited to that given inclause2 of BSAU242:1991. For the purposes of this standard the class of damage, for which a windscreen repair system may claim to be suitable, shall be divided into two ca
28、tegories. a) Category A. All damage types shown in Figure 1. b) Category B. Damage which includes only types which do not have cracks of any kind projecting from the edge or centre of the damaged area, i.e.clover leaf, bulls eye and half moon types as shown inFigure 1. 6 Test pieces NOTETest pieces
29、may be specially prepared or they may be cut from a flat laminated windscreen. Test pieces shall be of flat, clear, windscreen quality glass of symmetrical construction with an0.76mm polyvinyl butyral (PVB) high penetration resistant (HPR) interlayer. Test pieces of5mm nominal thickness shall have a
30、2.1mm+0.76mm+2.1mm construction. Test pieces of7mm nominal thickness shall have a3.0mm+0.76mm+3.0mm construction.BSAU251:1994 2 BSI 09-1999 The types of damage used for testing shall be appropriate to the damage category and test as given inTable 1, and shall be generated in the finally cut test pie
31、ces. Repairs shall be carried out in accordance with the manufacturers instructions. Test pieces shall be conditioned for a minimum of48h before testing, at a temperature of20 C 5 C and a relative humidity of60% 20%r.h. 7 Testing 7.1 Schedule of tests Each of the resin repair materials supplied with
32、 the repair system shall be subjected to the series of tests listed inTable 1 that is applicable to the category of damage types for which the resin repair material is claimed to be suitable (seeclause5). 7.2 Test conditions Unless otherwise specified for a particular test, testing shall be carried
33、out at a temperature of20 C 5 C and a relative humidity of60% 20% r.h. NOTECrack applicable to HGV and coach windscreens only (see2.2 of BSAU242:1991). Figure 1 Types of windscreen damageBSAU251:1994 BSI 09-1999 3 Table 1 Schedule of tests and types of damage to be used for testing 8 Performance 8.1
34、 General The repair system shall be deemed to conform to this British Standard if test pieces conforming to clause6 and subjected to appropriate testing requirements of clause7 conform to the requirements of clauses: 8.2 to8.10 inclusive for category A damage repairs; or to 8.2 to8.9 inclusive for c
35、ategory B damage repairs. 8.2 Resistance to high humidity 8.2.1 Initial testing After testing in accordance withAnnex A each repaired test piece shall conform to the following criteria. a) If a residual dull spot is visible in the repaired area this shall not exceed5mm in diameter. b) The repaired a
36、rea shall not show any loss of transparency or any discoloration. c) There shall be neither delamination nor reopening of cracks greater than2mm within a15mm radius from the centre point of the repaired area. 8.2.2 Retesting If one test piece fails to conform to8.2.1, testing shall be repeated on a
37、new set of three test pieces. The repair system shall only be deemed to conform to the high humidity resistance requirements of this standard if all three new test pieces conform to8.2.1. 8.3 Resistance to high temperature 8.3.1 Initial testing After testing in accordance withAnnex B each repaired t
38、est piece shall conform to the following criteria. a) If a residual dull spot is visible in the repaired area this shall not exceed5mm in diameter. b) No bubbles shall be visible adjacent to the repaired area. c) The repaired area shall not show any loss of transparency or any discolouration. d) The
39、re shall be neither delamination nor reopening of cracks greater than2mm within a15mm radius from the centre point of the repaired area. 8.3.2 Retesting If one test piece fails to conform to8.3.1, testing shall be repeated on a new set of three test pieces. The repair system shall only be deemed to
40、conform to the high temperature resistance requirements of this standard if all three new test pieces conform to8.3.1. 8.4 Resistance to radiation After testing in accordance withAnnex C each repaired test piece shall conform to the following criteria: a) If a residual dull spot is visible in the re
41、paired area this shall not exceed5mm in diameter. Test Test method Tests required for a windscreen repair material for: Category A damage Category B damage Types of damage to be generated, repaired and tested Star break a 15 mm to 25 mm diameter Crack b 100 mm long Bulls eye c 15 mm to 25 mm diamete
42、r Resistance to humidity Annex A X X Resistance to high temperature Annex B X X Resistance to radiation Annex C X X Visual appearance Annex D X X Optical distortion Annex E X X Light scatter Annex F X X Impact resistance 2.26 kg ball Annex G X X headform Annex H X X Mechanical strength Annex J X a A
43、 star break can be produced using a spring loaded percussion-centre punch. b The method for producing this crack is given inAnnex J. c Bulls eye damage can be produced using a ball bearing.BSAU251:1994 4 BSI 09-1999 b) The total luminous transmittance of the repaired area shall be not less than95% o
44、f the original value before irradiation, and shall be not less than an absolute minimum value of75%. c) The repaired area shall not show any loss in transparency or any discolouration. 8.5 Visual appearance 8.5.1 When examined in accordance withD.3.1 each test piece shall conform to the following cr
45、iteria. a) If a residual dull spot is visible in the repaired area this shall not exceed5mm in diameter. b) The repaired area shall not show any loss in transparency or any discoloration. c) The repaired area shall be free from visible voids, air bubbles and foreign materials. d) The repaired area s
46、hall be level with the surrounding glass and present a smooth surface which would not interfere with the wiper function. 8.5.2 After storage and re-examination in accordance withD.3.2 andD.3.3, each test piece shall conform to the criteria listed in8.5.1. 8.6 Optical distortion When tested in accord
47、ance withAnnex E, the optical distortion for each of the four test pieces shall not exceed2 of arc. 8.7 Light scatter 8.7.1 When tested in accordance withF.3.1, F.3.2 andF.3.3 the mean value of the light scatter through the four repaired areas in each test piece shall be not more than4% above the va
48、lue of the light scatter through the base glass. 8.7.2 After exposure to high humidity in accordance withF.3.4 and retesting in accordance withF.3.1 andF.3.3 the mean value of the light scatter through the four repaired areas in each test piece shall be not more than8% above the value of the light s
49、catter through the base glass. 8.8 Impact resistance (2.26 kg ball) 8.8.1 Initial tests When each test piece is tested in accordance withAnnex G, the ball shall not pass through the test piece within the5s following the impact. 8.8.2 Retests If one test piece fails to conform to8.8.1 testing shall be repeated on a new set of six test pieces. The repair system shall only be deemed to conform to the impact resistance (2.26 kg ball) requirement of this standard if all six new test pieces conform to8.8.1. 8.9 Impact resistance (headform) 8.9.1
