Compression permanent deformation test of vulcanized rubber or thermoplastic rubber

When rubber is compressed, it undergoes physical and chemical changes. When the compression force is removed, these changes prevent the rubber from returning to its original state, causing compression set. The size of the compression set depends on the temperature and time during compression, as well as the temperature and time during recovery.
At low temperatures, vitrification and crystallization effects are the main causes of compression permanent deformation in rubber. Since these effects will gradually disappear as the temperature rises, all measurements must be performed at the test temperature. The compression set test of vulcanized rubber or thermoplastic rubber can determine the compression set performance of vulcanized rubber or thermoplastic rubber under low temperature, normal temperature and high temperature conditions.
Zhongke Testing Reliability Experiment Center has the capability to test the reliability performance of various vulcanized rubbers or thermoplastic rubbers, and provides professional compression permanent deformation testing services for vulcanized rubbers or thermoplastic rubbers.

Vulcanized rubber: flat vulcanizing machine vulcanizing type, vulcanizing tank vulcanizing type, continuous vulcanizing type, special vulcanizing type, etc.
Thermoplastic rubber: polystyrene, polyurethane, polyolefin, polyester, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, polyethylene-butyl rubber joint copolymer, etc.

1.
under normal temperature and high temperature conditions At standard laboratory temperature, a sample with a known height is compressed to a specified height according to the compression ratio requirements. It is compressed for a certain period of time at standard laboratory temperature or high temperature conditions, and then the compression is removed under certain temperature conditions. The sample is returned to a free state for a specified time, and the height of the sample is measured.
2.
under low temperature conditions Compress a specimen of known height to a specified height at standard laboratory temperatures. Maintain a certain period of time under specified low temperature conditions, then release the compression at the same low temperature, restore the specimen to a free state, and measure the height of the specimen: it can be measured once every specified time (by plotting the compression height versus time, the compression permanent deformation characteristics of the specimen under low temperature conditions can be evaluated), or it can be measured after the specified time.

GB/T 7759.2-2014 Vulcanized rubber or thermoplastic rubber - Determination of compression set - Part 2:
under low temperature conditions GB/T 7759.1-2015 Vulcanized rubber or thermoplastic rubber - Determination of compression permanent deformation - Part 1:
under normal and high temperature conditions ISO 815-1: 2008 Determination of compression set of vulcanized rubber or thermoplastic rubber Part 1:
at normal and high temperatures ISO 815-2: 2008 Vulcanized rubber or thermoplastic rubber - Determination of compression set - Part 2: Under low temperature conditions