Compression set evaluates a material’s ability to maintain elastic behavior after subjection to prolonged compression. The value is related to sealing force retention and stress relaxation phenomenon. Most typically measured for elastomers, but applicable to thermoplastics and other materials in certain cases.
Standard and custom button compression, constant deflection
Instrumented constant load testing
Standard testing in air
O-ring and custom specimen geometries
Testing immersed in fluids and/or gases
Testing at low temperature
Sample requirements vary by standard. The most common is ASTM D395 Method B, which requires buttons of 12.5 mm x 29.0 mm (0.49 in x 1.14 in) for Type 1 or 6.0 mm x 13.0 mm (0.24 in x 0.51 in) for Type 2 specimens. Plied (stacked) specimens cut from molded plaques, and o-ring specimens are also appropriate.
Typically a minimum of three specimens are measured.
If you don’t see what you are looking for here, just call or send us a note….we can perform many other tests including customized one-of-a-kind tests.