1、BRITISH STANDARD CONFIRMED JULY 1989 BS 2782-1: Method 131B: 1983 Methods of testing Plastics Part 1: Thermal properties Method 131B: Determination of extensibility after heat ageing of flexible polyvinyl chloride sheet IMPORTANT NOTE. Before reading this method it is essential to read BS 2782-0, is
2、suedseparately. UDC 678.5/.8:678.01:620.172.222:620.193.918.2:678.743.22 415BS2782-1:Method131B:1983 This British Standard, having been prepared under the directionof the Plastics StandardsCommittee, was published under the authorityofthe Board of BSIandcomes intoeffect on 28 February 1983 BSI 12-19
3、99 The following BSI references relate to the work on this standard: Committee reference PLC/40 Draft (reference 82/53325) announced in BSI News September 1982 ISBN 0 580 13175 0 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are
4、 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 front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard
5、 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. Amendments issued since publication Amd. No. Date of issue CommentsBS2782-1:Method131B:1983 BSI 12-1999 i Contents Page 0 Introduction 1 1 Scope 1
6、 2 Principle 1 3 Form and number of test specimens 1 4 Procedure 1 5 Report 1 Publications referred to Inside back coverii blankBS2782-1:Method131B:1983 BSI 12-1999 1 0 Introduction This method has been prepared under the direction of the Plastics Standards Committee and is for assessing the tendenc
7、y of polyvinyl chloride sheet to deteriorate in service through loss of plasticizer. It is an editorial revision of method 110A of BS2782:1970, which is being withdrawn. WARNING NOTE. This method does not necessarily detail all precautions necessary to meet the requirements of the Health and Safety
8、at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions, and the method should be operated only by trained personnel. 1 Scope This method describes a procedure for assessing the tendency of polyvinyl chloride sheet, of thickness not exceeding 0.9 mm, to deteriorate in s
9、ervice through loss of plasticizer by volatilization. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle The extensibility test described in BS 2782:Method 150C is applied, but at room temperature, to material that has been heated for24 h
10、 at 100 C over activated carbon. 3 Form and number of test specimens The form and number of test specimens shall be as specified in BS 2782:Method 150C. 4 Procedure Test the specimen for extensibility in accordance with BS 2782:Method 150C except for the following. a) Before test, heat the specimen
11、at 100 C for 24 h in the presence of activated carbon with the apparatus and under the conditions specified inMethod 465B of BS 2782:Methods 465A and465B. and b) Keep the specimen, after removal from the cage, at 23 2 C for not less than 3 h and test for extensibility at 23 2 C. Use the average grav
12、imetric thickness of the specimen determined in accordance with BS2782:Method 631A and the width of the specimen before heat ageing to calculate the load corresponding to a stress of 10.3 MPa. 5 Report The report shall state: a) a complete identification of the material tested including type, source
13、, manufacturers code number etc.; b) a reference to this British Standard method, i.e. BS 2782:Method 131B:1983; c) the extensibility after heat ageing of the material; d) when necessary, the direction of the major axes of the test specimens in relation to the direction of some feature of the sheet;
14、 e) the individual test results; f) the conditioning, if any, of the test specimens.2 blankBS2782-1:Method131B:1983 BSI 12-1999 Publications referred to BS 2782, Methods of testing plastics. BS 2782-0, Introduction. BS 2782:Method 150C, Determination of low temperature extensibility of flexible poly
15、vinyl chloride sheet. BS 2782:Methods 465A and 465B, Determination of loss of plasticizers (activated carbon method). BS 2782:Method 631A, Determination of gravimetric thickness and yield of flexible sheet. BS 2782-1: Method 131B: 1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInst
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