BS ISO 2007:2018 pdf download – Rubber, unvulcanized — Determination of plasticity — Rapid-plastimeter method 5.1.2 Means for moving one or other of the two platens normal to its surface, to compress the test piece to a thickness of 1,00 mm ± 0,01 mm. The mode of movement of the platen and the forces applied in this operation shall be such that, with or without the test piece in place, the movement is always completed within a period of 2 s. A force of at least 300 N is required and can be conveniently provided by springs. 5.1.3 Means of applying to one or other platen a test force of 100 N ± 1 N normal to its surface to compress the test piece. 5.1.4 Means for indicating the thickness of the test piece to the nearest 0,01 mm when it is between the platens. 5.1.5 Timing device, so that the test can be timed in seconds to an accuracy of 0,2 s. 5.1.6 Heating device and temperature control system, capable of maintaining the temperature of the upper and lower platens and that of the platens to within ±1 °C of the test temperature. 5.2 Punch, capable of producing test pieces of approximately constant volume quickly and without difficulty. The punch shall consist of a flat-ended cylindrical anvil and a coaxial tubular knife, moving independently of one another. A single action of the handle shall compress a portion of the material to a thickness of 3,4 mm ± 0,2 mm and shall cut out a disc of approximately 13 mm diameter. Figure 2 is a schematic diagram of a punch. 5.3 Bleached, unglazed, acid-free tissue paper, of approximately 17 g/m 2 or cigarette paper of about 22 g/m 2 to 26 g/m 2 , cut into two equal pieces. Both papers shall use the dimension of 30 mm × 45 mm. For interlaboratory testing, paper from the same source shall be used. 6 Test piece Raw rubber shall be homogenized when comparative tests are carried out. The preparation and homogenization of the sample shall be carried out in accordance with the provisions of ISO 1795. The test piece shall be a disc of rubber approximately 13 mm in diameter and with a thickness of 3,4 mm ± 0,2 mm. If the specified thickness is attained by compressing an initially thicker sheet, the latter shall be not more than 3,6 mm...

Download Address

  • Download