Rubber Compression and Deformation Tester(ASTM D395)

The determination of the vulcanized rubber machine applies a constant strain compression deformation of the test method. This test is compressed to the provisions of vulcanized rubber specimens under a high temperature, after a certain temperature and time, or media infiltration, which determines the rate of the sample compression set.

Application:

Rubber Compression Set Tester is used especially to test the static compression for rubber.

Standards:

CNS-3560, 10487; JIS-K6301; ASTM D395 Method B，ISO 815, ISO 1856,GB/T 7759, GB/T 6669.

Test Principle：

Take standard specimens, clamp between this flat plates, screw rotation, compress to a certain ratio, then put in a certain temperature of oven (purchase separately), after the prescribed time, remove the specimen, cooling for 30 minutes, measuring its thickness for calculating its permanent deformation rate.

Product Parameters：

Feature：

Place one standard specimen between parallel flat plates, revolve the screws then compress it a certain range of percentage and then put into the oven under the specified temperature for a certain time period then take it off cooling for 30 minutes to measure its thickness for calculating its permanent deformation rate.

ASTM D395 Method B Test Procedure:

Test Procedure

1、Original Thickness Measurement: Measure the original thickness of the specimen to the nearest 0.02 mm (0.001 in.). Place the specimen on the anvil of the dial micrometer so that the presser foot will indicate the thickness at the central portion of the top and bottom faces.

2、Application of Compressive Force: Place the test specimen between the plates of the compression device with the spacers on each side, allowing sufficient clearance for the bulging of the rubber when compressed (see Fig. 3). Where a lubricant is applied, it shall consist of a thin coating of a lubricant having substantially no action on the rubber. For most purposes, a silicon or fluorosilicon fluid is suitable. Tighten the bolts so that the plates are drawn together uniformly until they are in contact with the spacers. The amount of compression employed shall be approximately 25 %. A suitable mechanical or hydraulic device may be used to facilitate assembling and disassembling the test fixture.

3、Test Time and Temperature: Choose a suitable temperature and time for the compression set, depending upon the conditions of the expected service. In comparative tests, use identical temperature and test periods. It is suggested that the test temperature be chosen from those listed in Practice D 1349. Suggested test periods are 22 h and 70 h. The test specimen shall be at room temperature when inserted in the compression device. Place the assembled compression device in the oven within 2 h after completion of the assembly and allow it to remain there for the required test period in dry air at the test temperature selected. At the end of the test period, take the device from the oven and remove the test specimen immediately and allow them to cool.

4、Cooling Period: While cooling, allow the test specimen to rest on a poor thermally conducting surface, such as wood, for 30 min before making the measurement of the final thickness. Maintain the conditions during the cooling period in accordance with 4.2.4.

5、Final Thickness Measurement: After the rest period, measure the final thickness at the center of the test specimen in accordance with 1.