1、BRITISH STANDARD BS2782-1: Method150C: 1983 Methods of testing Plastics Part1: Thermal properties Method150C: Determination of low temperature extensibility of flexible polyvinyl chloride sheet IMPORTANT NOTE. Before reading this method it is essential to read BS2782-0, issued separately. UDC 678.5/
2、.8:678.01:620.172.251.125:678.743.22415BS2782-1:Method 150C:1983 This British Standard, having been prepared under the directionof the Plastics StandardsCommittee, was published under the authority ofthe Board of BSI and comesintoeffect on 28 February1983 BSI11-1999 The following BSI references rela
3、te to the work on this standard: Committee reference PLC/40 Draft (reference82/52803) announced in BSI News September1982 ISBN 0 580 13176 9 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applica
4、tion. 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, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and
5、 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:Method 150C:1983 BSI 11-1999 i Contents Page 0 Introduction 1 1 Scope 1 2 Principle 1 3 Apparatus 1 4 Form of te
6、st specimen 1 5 Number of test specimens 1 6 Procedure 1 7 Report 2 Figure 1 Apparatus for measuring low temperature extensibility 2 Publications referred to Inside back coverii blankBS2782-1:Method 150C:1983 BSI 11-1999 1 0 Introduction This method has been prepared under the direction of the Plast
7、ics Standards Committee. Method150C is one of a series of methods described in BS2782 for assessing the effect of temperature (particularly low temperature) on the properties of non-rigid plastics materials. It is an editorial revision of method104C of BS2782:1970, which is being withdrawn. The othe
8、r methods in this group which have been published are as follows. Method150A: Determination of stiffness in torsion as a function of temperature; Method150B: Determination of cold flex temperature of flexible polyvinyl chloride compound; Method150D: Cold crack temperature of film and thin sheeting.
9、WARNING NOTE. This method does not necessarily detail all precautions necessary to meet the requirements 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 des
10、cribes a procedure for assessing the effect of relatively low temperatures on the stiffness of polyvinyl chloride sheet of thickness not exceeding0.9mm. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle Method150C measures the extension
11、of a test specimen under a tensile stress of10.3MPa at5 C. 3 Apparatus The apparatus shall be such that a tensile stress of10.3MPa, calculated on its original cross-sectional area, can be applied to the specimen. It shall be possible to increase the stress uniformly from zero at20.7 0.4MPa per min.
12、Two grips with an initial free length of127mm between them shall be provided for applying the force to the test specimen and there shall be a device for measuring the extension of the127mm length of test specimen between the clamps to the nearest1%. The apparatus shall include a cooling bath maintai
13、ned at5 0.5 C in which the specimen can be completely immersed during test. The cooling medium shall consist of a mixture of one volume of industrial methylated spirit 1)complying with BS3591 and three volumes of water, to which mixture, solid carbon dioxide shall be added as necessary to maintain t
14、he specified temperature. A suitable apparatus is shown in Figure 1. 4 Form of test specimen The specimen shall be180mm long and6.3 0.1mm wide cut from sheet. The thickness of the specimen shall be the thickness of the sheet which shall not exceed0.9mm. 5 Number of test specimens Three specimens sha
15、ll be used (see clause10 of BS2782-0:1982). 6 Procedure Use the average gravimetric thickness of the specimen determined in accordance with BS2782:Method631A and the width of the specimen to calculate the force required to give a stress of10.3MPa on the specimen. Adjust the loading device to apply t
16、his calculated force. If the apparatus is constructed in such a manner that the load applying the force is immersed in the cooling medium during the test, make suitable allowance for buoyancy. Set the grips on the apparatus127 1.3mm apart and thread the specimen through them. Tighten the upper grip
17、on to the specimen so that the central127mm portion of the specimen will be between the grips. Attach a20g mass to the lower end of the specimen to keep it taut and then tighten the lower grip. Completely immerse the specimen in the cooling medium. For sheet of thickness not exceeding0.4mm the time
18、of immersion shall be30 1s. For sheet of nominal thickness exceeding0.4mm but not exceeding0.9mm the time of immersion shall be60 2s. At the end of the appropriate period of immersion a force shall be applied to the specimen increasing from zero at a uniform rate so that a tensile stress of10.3MPa i
19、s reached in30s. When this stress is reached, read the extension of the specimen to the nearest1.3mm. 1) It should be noted that the use of industrial methylated spirit is governed by the Methylated Spirits Regulations1952 (S.I.1952, 2230).BS2782-1:Method 150C:1983 2 BSI 11-1999 Take care to ensure
20、that the temperature is maintained at the specified value and that the specimen remains totally immersed during the application of the force. Calculate the extension of the specimen as a percentage of the initial distance between the grips. Report the low temperature extensibility of the material un
21、der test as the arithmetic mean of the results obtained on the test specimens. 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 Standard method, i.e.BS2782:Method150C:1983; c) t
22、he low temperature extensibility 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; e) the individual test results; f) the conditioning, if any, of the test specimens. Figure 1 Apparatus for measuring l
23、ow temperature extensibilityBS2782-1:Method 150C:1983 BSI 11-1999 Publications referred to BS2782, Methods of testing plastics. BS2782-0, Introduction. BS2782:Method631A, Determination of gravimetric thickness and yield of flexible sheet. BS3591, Industrial methylated spirits. BS2782-1: Method150C:
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