BS 3424 P8-1983
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ID： |
5892A4DBC6FC457C84ADE2B8B082B73F |
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文件大小(MB)： |
0.77 |
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页数： |
20 |
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文件格式： |
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日期： |
2008-1-23 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
0,BS 3424: Part 8:1983,UDC 677.077.652:678.066.2:677.017.4-974,y , 一丁 1 7「泊 瓢#鼠手"唯____________________________：________________,. British Standards Institution. No part of this publication may be photocopied,or otherwise reproduced without the prior permission in writing of BSI.,British Standard,Testing coated fabrics,Part 8. Methods 10A, 10B and 10C. Methods for determination,of low temperature performance,Essais des tissus enduits,Partie 8. Methodes 10A, 10B et 10C. Methodes de determination des,caracteristiques a basse temperature,Priifung beschichteter Gewebe,Teil 8. Verfahren 10A, 10B, 10C. Verfahren zur Bestimmung des,Verhaltens bei niedrigen Temperaturen,IMPORTANT NOTE. It is recommended that this Part be read in conjunction with the information in Part 0 Toreword and general,information'.,Foreword,In reviewing method 10 the Committee responsible was,concerned to remove the anomalies in test results which,had manifested themselves during attempts to apply,method 10 to all forms of coated fabrics. At the same,time a number of international methods of test were to,be considered. Consequently, whilst method 10 (now,method 10A) of the last edition has been maintained,it has also been extended in that crack propogation is now,more clearly defined. The limitations of the test also have,been acknowledged.,The Committee was also conscious of the fact that,method 10A and method 10C (based on ISO 4646,published by the International Organization for,Standardization (ISO)), limited the thickness of coated,specimens to around 2 mm. Alternative methods were,considered for assessing coated fabrics of greater thicknesses.,It was concluded that the principle inherent in,ISO 4675 provided the best available standardized means,of doing this. Consequently, whilst method 10B fulfils all,the requirements of ISO 4675, additional information has,been provided for the testing of materials intrinsically,more rigid than the materials envisaged by ISO 4675 and,also to enable cracks to be more clearly defined.,The provisions of method 10C fulfil the requirements of,ISO 4646 but additional information has been ihcluded,concerning test instrument details as it was felt that the,information provided by ISO 4646, whilst accurate and,unambiguous, was insufficiently detailed and suffered,from the criticism that it did not make it explicit that,the striking arm needed to be positively driven if problems,associated with the dissipation of momentum of the,striking arm were to be avoided. Consequently the details,of the test instrument described in ISO 4646 have been,supplemented by additional data drawn from,BS 903 : Part A25. In so doing, however, the criteria set,out in ISO 4646 have been adhered to strictly. Method 10C,has been included as a means of assessing low temperature,impact performance in those cases where method 10A is,found unsuitable due to the specimen configuration during,the test.,Fabrics coated with rubber or plastics are used in different,applications requiring low temperature flexing, and therefore,no general relationship between these tests and service,performance can be predicted.,This Part of this standard supersedes method 10 of,BS 3424 : 1973.,Compliance with a British Standard does not of itself,confer immunity from legal obligations.,050920031178,British Standards Institution,BS 3424 : Part 8 : 1983,1. Scope,This Part of this British Standard describes three methods,of determining the low temperature performance of coated,fabrics.,NOTE. The titles of the publications referred to in this standard,are listed on page 9.,2. Method 10A. Determination of cold crack,temperature,2.1 General. The cold crack temperature is not a sharply,defined temperature, and it is possible that the range of,temperatures over which cracking occurs in some proportion,of test specimens varies with different materials.,The cold crack temperature varies also with the rate of,folding, in that the quicker the folding the higher the,temperature at which cracking occurs. The apparatus used,in this test is designed to make available sufficient kinetic,energy to ensure a flat fold in the test specimen by impact,at a velocity of 2 m/s.,In addition, the test result is influenced by the criterion,of cracking since, in the broadest sense, cracking is anything,from a local crack in the surface of the coating not visible,to the naked eye, to one extending across the width of the,specimen and down to the fabric; it is essential, therefore,to define the criterion of cracking in such a way as to give,the maximum reproducibility of the result.,NOTE. It should be noted however that this method is only,considered suitable ……
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