BS 2782-6 Method 641A-1983 Methods of testing plastics - Dimensional properties - Determination of dimensional stability at 100 C of flexible polyvinyl chloride sheet《塑料试验方法 第6部分 尺.pdf

1、BRITISH STANDARD CONFIRMED FEBRUARY 1991 BS 2782-6: Method 641A: 1983 Incorporating Amendment No. 1 Methods of testing Plastics Part 6: Dimensional properties Method 641A: Determination of dimensional stability at 100 C of flexible polyvinyl chloride sheet IMPORTANT NOTE. Before reading this method

2、it is essential to read BS 2782-0, issued separately. UDC 678.5/.8:678.01:620.179.7 97C100:678.743.22 41BS2782-6:Method 641A:1983 This British Standard, having been prepared under the directionof the Plastics StandardsPolicy Committee, waspublished under the authorityof the Board of BSIandcomes into

3、 effect on 28 February 1983 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PLC/40 Draft (reference 82/52804) announced in BSI News September 1980 ISBN 0 580 13177 7 A British Standard does not purport to include all the necessary provisions of a con

4、tract. 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 front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back

5、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. Amendments issued since publication Amd. No. Date of issue Comments 6282 February 1991 Indicated by a sidelin

6、e in the marginBS2782-6:Method 641A:1983 BSI 12-1999 i Contents Page 0 Introduction 1 1 Scope 1 2 Principle 1 3 Form of test specimen 1 4 Number of test specimens 1 5 Procedure 1 6 Expression of results 1 7 Report 1 Publication referred to Inside back coverii blankBS2782-6:Method 641A:1983 BSI 12-19

7、99 1 0 Introduction This method has been prepared under the direction of the Plastics Standards Policy Committee. Method 641A is an editorial revision of method106F of BS2782:1970, which is being withdrawn. WARNING NOTE. This method does not necessarily detail all precautions necessary to meet the r

8、equirements of the Health and Safety at Work etc. Act1974. 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 relative amount of moulded-in strain in flexible PVC she

9、et, a factor affecting the dimensional stability of the material at room temperature. NOTEThe title of the publication referred to in this standard is given on the inside back cover. 2 Principle Method 641A determines the reduction in length of a rectangular piece of flexible polyvinyl chloride shee

10、t when it is heated at100 C for15min. 3 Form of test specimen The test specimen shall be a piece250mm long and6mm to7mm wide cut from a sample taken from a roll or a sheet. Immediately after the sample has been taken it shall be kept at a temperature not exceeding30 C and then kept at23 2 C for not

11、less than2h immediately before the test specimen is cut and measured. 4 Number of test specimens The number of test specimens and the positions within the sheet or roll of sheet under test from which they shall be cut shall be as specified in the relevant British Standard for the material. 5 Procedu

12、re Measure the length (L 1 ) of the test specimen to the nearest0.5mm. Take care that the test specimen remains flat and straight when its length is measured. NOTEA convenient method of ensuring that it does, is to place the test specimen in a rectangular groove approximately300mm long,7mm wide and

13、1.5mm deep in a block of wood or other suitable material with a flat upper surface. Measurements of length may be made with a transparent rule suitably graduated and fitting into the groove. When the test specimen has been measured, immerse it for a period of151min in a water bath at a temperature o

14、f100 1 C. Ensure that the test specimen does not touch the sides or bottom of the water bath. NOTEA cage of metal gauze with feet is a suitable means of achieving this. On removal from the water, allow the test specimen to cool in air at23 2 C for at least15min. Take care to avoid stretching the tes

15、t specimen in handling it. Then measure the length (L 2 ) of the test specimen to the nearest0.5mm. Calculate the change in length of the test specimen as follows: percentage change = where Repeat the above procedure for remaining test specimens. 6 Expression of results Express the dimensional stabi

16、lity at100 C of the material under test as the percentage change in length of the test specimen that shows the greatest change. 7 Report The report shall state: a) a complete identification of the material tested including type, source, manufacturers code number etc.; b) a reference to this British

17、Standard method, i.e.BS 2782:Method 641A:1983; c) the dimensional stability at100 C of the material; d) the individual test results and the positions of the test specimens relative to the roll or sheet under test; e) the conditioning, if any, of the test specimens. L 1 is the initial length of the t

18、est specimen, and L 2 is the length of the test specimen after heating and cooling in air. L 1 L 2 L 1 -100 2 blankBS2782-6:Method 641A:1983 BSI 12-1999 Publication referred to BS 2782, Methods of testing plastics. BS 2782-0, Introduction. BS 2782-6: Method 641A: 1983 BSI 389 Chiswick High Road Lond

19、on W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revisio

20、n. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Se

21、cretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying

22、standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British

23、Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give detail

24、s on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membe

25、rship Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may

26、 be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, a

27、nd size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.