ISO-2007-1991.pdf
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1、INTERNATIONAL STANDARD IS0 2007 Third edition 1991-11-15 Rubber, unvulcanized - Determination of plasticity - Rapid-plastimeter method Caoufchouc non vulcanis - DBferminafion de /a plasticif - MBfhode au plasfom a single action of the handle shall compress a portion of the material to a thickness of
2、 approximately 3 mm and shall cut out a disc of approximately 13 mm diameter. The test piece need only be approximately constant in vol- ume because the final shaping to exact dimensions is carried out in the instrument during the preheat- ing period. 4.3 Bleached, unglazed, acid-free tissue paper,
3、of approximately 17 g/m*. For interlaboratory testing, paper from the same source shall be used. 5 Test piece Raw rubber shall be homogenized when compar- ative tests are to be carried out. The preparation and homogenization of the sample shall be carried out in accordance with the provisions of IS0
4、 1796. The test piece shall be a disc of rubber approxt- mately 13 mm in diameter and atproximately 3 mm thick, having a volume of 0,40 cm rt: 0,04 cm . If the specified thickness is attained by compressing an initially thicker sheet, the latter shall be not more than 4 mm thick. 6 Calibration The s
5、ettings of the rapid plastimeter shall be checked against the maker s instructions. The load- ing spring shall be recalibrated (at 100 N + 1 N) ev- ery 6 weeks, and the timing unit pre-heating time (15 5 s and test period 15 s rt: 0,2 s every 4 weeks. The position of the top platen shall be checked
6、before each test. A sample of standard butyl rubber can be used to check whether the machine is in working order. The test pieces shall in this case be prepared from a sheet approximately 3 mm thick, cut from the stan- dard butyl rubber sample. The standard rubber may be obtained from a Na- tional T
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