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1、BRITISH STANDARD BS 2782-1: Method 153B: 1991 ISO 458-2: 1985 Methods of testing Plastics Part 1: Thermal properties Method 153B: Determination of stiffness in torsion of flexible materials (method for vinyl chloride compounds) IMPORTANT NOTE. Before reading this method it is essential to read BS 27
2、82-0, Introduction, issued separately. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:49:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-1:Method 153B:1991 This British Standard, having been prepared under the direction of the Plastics and Rubber Stand
3、ards Policy Committee, was published under the authority of the Standards Board and comes into effect on 29 November 1991 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference PRM/21 Draft for comment 83/51069 DC ISBN 0 580 20161 9 Committees responsible f
4、or this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies were represented: British Plastics Federation British Steel Industry British Telecommunications
5、 plc British Textile Confederation Department of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) EEA (The Association of Electronics, Telecommunications and Business Equipment Industries) Electrical and Electronic Insulation Associati
6、on (BEAMA Ltd.) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Ministry of Defence Packaging and Industrial Films Association Plastic Industrial Containers Association Plastics and Rubber Institute PIRA International RAPRA Technology Ltd. Yarsley Technical Centre Ltd. Amend
7、ments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:49:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-1:Method 153B:1991 BSI 09-1999i Contents Page Committees responsibleInside front cover National forewo
8、rdii 0Introduction1 1Scope and field of application1 2Reference1 3Principle1 4Equipment1 5Test specimens1 6Procedure1 7Expression of results2 8Test report2 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:49:16 GMT+0
9、0:00 2006, Uncontrolled Copy, (c) BSI BS 2782-1:Method 153B:1991 ii BSI 09-1999 National foreword This British Standard has been prepared under the direction of the Plastics and Rubber Standards Policy Committee and is identical with ISO 458-2:1985 “Plastics Determination of stiffness in torsion of
10、flexible materials Part 2: Application to plasticized compounds of homopolymers and copolymers of vinyl chloride”, published by the International Organization for Standardization (ISO). WARNING NOTE. This British Standard, which is identical with ISO 458-2, does not necessarily detail all the precau
11、tions necessary to meet the requirements of the Health and Safety at Work, etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the necessary provisions of a contr
12、act. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 458-1:1985BS 2782 Methods of testing plastics Method
13、153A:1991 Determination of stiffness in torsion of flexible materials (general method) (Identical) 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 has been updated (see copyright date)
14、and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:49:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-1:Method 153B:1991 BSI 09-19991 0 Intro
15、duction In the case of compositions based on plasticized polyvinyl chloride, all the curves for the logarithm of the stiffness in torsion as a function of temperature have a similar appearance, in the form of a reversed S. Each curve is essentially characterized by three regions: a) two extreme regi
16、ons, where the change in the stiffness as a function of temperature occurs relatively slowly: 1) a region of elevated values, corresponding to a high degree of rigidity, attributed by some authors to a loss of elastic properties. The value of the stiffness in torsion was taken arbitrarily by Clash a
17、nd Berg1) as 3,1 109dyn/cm22), 2) a region of low values, corresponding to a high degree of flexibility. In this case the corresponding stiffness in torsion has been arbitrarily taken as 42 kgf/cm23) representing an appropriate value for films having a sufficient degree of flexibility at normal use
18、temperature to render them suitable for the production of curtains, drapes and waterproof materials; b) an intermediate region where the change in the stiffness is generally more rapid and where the curve exhibits an inflection. This region has been arbitrarily allotted the value of 233 kgf/cm24) as
19、 stiffness in torsion. With allowance for the precision of the tests, the characteristic values for the stiffness in torsion can therefore be represented as: 1 Scope and field of application This part of ISO 458 specifies a method for determining the temperatures corresponding to three conventional
20、characteristic values for the stiffness in torsion of plasticized compounds of homopolymers and copolymers of vinyl chloride. 2 Reference ISO 458-1, Plastics Determination of stiffness in torsion of flexible materials Part 1: General method. 3 Principle Use of ISO 458-1 for plasticized compounds of
21、homopolymers and copolymers of vinyl chloride, consisting of determining, according to a special case of method A with an angle of deflection between 55 and 65, the temperatures corresponding to three characteristic values of the stiffness in torsion (T), i.e. : 300 MPa, 23 MPa and 4 MPa. 4 Equipmen
22、t See ISO 458-1. 5 Test specimens To construct a curve showing the same deformation of the test specimen at the characteristic points, the following test specimens are required: a) one test specimen (1) with thickness between 1,8 and 2 mm for determining the section of the curve in the region 300 MP
23、a; b) one test specimen (2) with thickness between 2 and 5 mm for determining the section of the curve in the region 23 MPa; c) one test specimen (3) with thickness between 4 and 5 mm for determining the section of the curve in the region 4 MPa. All test specimens shall be 60 2 mm in length and 6,2
24、to 6,4 mm in width. NOTE 1For the purpose of a rapid test it is possible to use a single test specimen between 4 and 5 mm thick for constructing the sections of the curve passing through the points 23 MPa and 4 MPa. NOTE 2Certain properties of plastics and, in particular, the properties involved in
25、this test method can change slightly on storage. It is therefore recommended to record the dates of preparation of test specimens, and in comparing samples to store the specimens for at least 48 h before testing. 6 Procedure 6.1 Selection of applied torque Use the formula (see ISO 458-1 for definiti
26、ons and units) 1) Clash, R.F., and Berg, R.M., Vinyl elastomers: low temperature flexibility behaviour, Industrial and Eng. Chem. 34, pp. 12181222 (1942). 2) 3,1 109dyn/cm2= 310 MPa 3) 42 kgf/cm2= 4,1 MPa 4) 233 kgf/cm2= 22,8 MPa 300 MPa 23 MPa 4 MPa Tk M -= Licensed Copy: London South Bank Universi
27、ty, London South Bank University, Tue Dec 12 08:49:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-1:Method 153B:1991 2 BSI 09-1999 to calculate the applied torques M1, M2, M3 to be used with test specimens (1), (2), (3), respectively, to give an angle of deflection of 60 5 for each of the thr
28、ee characteristic values of T: 6.2 Selection of temperatures Select as the initial temperatures a multiple of 5 C corresponding essentially to the maximum level of the stiffness value. In the absence of the required data, select 40 C. 6.3 Measurement 6.3.1 Follow the instructions of method A specifi
29、ed in ISO 458-1, with a 40 mm span, using test specimen (1) and the additional weights needed to obtain the applied torque M1 as calculated in accordance with 6.1. Record the temperature to the nearest 1 C and the corresponding value of the angle of deflection to the nearest 1. If the angle of defle
30、ction is greater than 65, proceed to a new test using a different test specimen, starting with a lower temperature. If the angle of deflection is less than 55, increase the temperature by 5 C and proceed with the test. Repeat the above operation so as to obtain at least three valid tests. 6.3.2 Repe
31、at the same operations using test specimen (2) and applied torque M2. 6.3.3 Repeat the same operations using test specimen (3) and applied torque M3. 7 Expression of results Plot the logarithm of the values of stiffness in torsion versus temperature. Note on the curve the temperatures corresponding
32、to the three conventional characteristic stiffnesses in torsion: 300 MPa, 23 MPa and 4 MPa. 8 Test report The test report shall include the following particulars: a) a reference to this part of ISO 458; b) the particulars specified in clause 8 of ISO 458-1; c) temperatures corresponding to the three
33、 conventional characteristic values of stiffness in torsion of plasticized PVC compounds: 300 MPa, 23 MPa and 4 MPa. T1= 300 MPa T2= 23 MPa T3= 4 MPa Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:49:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-1:Me
34、thod 153B:1991 BSI 09-1999 Publication(s) referred to See national foreword. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:49:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-1: Method 153B: 1991 ISO 458-2: 1985 BSI 389 Chiswick High Road London W4 4AL
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