High Temperature and Low Temperature Compression Test of Rubber O - Ring

Rubber O-ring In a standard test temperature or high temperature conditions test, a simple screw device compression device can meet the requirements of the compressed sample. A low-temperature test is to be carried out by means of a quick-release device, which may be either mechanical or pneumatic.

Rubber O-ring test High-temperature box, low-temperature box should be consistent with the relevant provisions of GB / T 9868, can keep the compression device and sample test temperature tolerance range. The cryostat may be mechanically cooled or may be cooled directly with dry ice or liquid nitrogen.

Rubber O-ring for low temperature test in the low temperature, in order to maintain the temperature within the allowable range can be used to prevent the test box and the outside world in direct contact with the appropriate equipment (for example: the door playing two sets of holes), which can The height of the sample is measured in a cryostat. Test temperature directly in the compression plate near the measurement accuracy of soil 0.5C.

The time to reach the equilibrium temperature depends on their model and the heat capacity of the compression device. In order to make the high temperature conditions for 24 h duration of the test results are comparable, the test up to 3h that is within the test temperature should reach the allowable tolerance within the standard laboratory temperature, the known height of the sample, according to the compression rate requirements compression To a specified height, under certain temperature conditions, the compression for a certain time, and then remove the compression under standard temperature conditions, the specimen in the free state, return to the specified time to measure the height of the sample.

Rubber O-ring in the standard test temperature, the known height of the sample, according to the compression rate required to compress to the required height, rubber O-ring at the specified low temperature test temperature, compression for a certain time, and then remove the same low- The sample was recovered in a free state, and the rubber O-ring was measured at a fixed time interval at a low temperature to obtain a logarithmic curve of the height and the time of the sample to evaluate the compression set characteristics.