Compression Set Test Fixture

Compression Set Testing according to ASTM D395 test method, measures the ability of rubber to return to its original thickness after prolonged compressive stresses at a given temperature and deflection. As a rubber material is compressed over time, it loses its ability to return to its original thickness. This loss of resiliency (memory) may reduce the capability of an elastomeric gasket, seal or cushioning pad to perform over a long period of time. The resulting permanent set that a gasket may take over time may cause a leak; or in the case of a shock isolation pad, the ability to protect an accidentally dropped unit may be compromised. Compression Set results for a material are expressed as a percentage maximum figure. The lower the percentage figure, the better the material resists permanent deformation under a given deflection and temperature range.

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