Stress relaxation aging test of vulcanized rubber or thermoplastic rubber

The change in stress of a rubber sample with time under a given elongation is the result of a combination of physical and chemical processes that exist simultaneously. When thin rubber specimens are exposed to an oxygen-containing environment at high temperatures for a long time, chemical processes dominate. Therefore, under such conditions, after a period of exposure, the aging properties of rubber can be determined by testing the stress changes of thin rubber specimens deformed under tension.
Zhongke Testing Reliability Experiment Center has the ability to test the reliability performance of various vulcanized rubbers or thermoplastic rubbers, and provides professional stress relaxation aging 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. Method A is for measurement under continuous strain conditions.
2. Method B is the preferred method for measurements under intermittent strain conditions.
3. In both cases of methods A and B, use a stress relaxation meter to record the stress at the aging temperature.
Method C can be used instead of Method B for measurements under intermittent strain conditions.
In Method C, the specimen is removed from the aging environment and the stress is measured at standard laboratory temperatures.

GB/T 9871-2008 Determination of aging properties of vulcanized rubber or thermoplastic rubber - Tensile stress relaxation test
ISO 6914:2004 Determination of aging properties of vulcanized rubber or thermoplastic rubber Tensile stress relaxation test
ISO 188:1998 Accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber
ISO 5893: 2002 Specification for testing instruments for rubber and plastics, tension, bending and compression type (constant speed movement)
ISO 18899: 2004 Guide for Calibration of Rubber Testing Instruments