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Gehman torsional test. Method for measuring low temperature stiffening of rubber by a calibrated torsion wire. (ASTM D-1053). Results often are reported as apparent modulus of rigidity, which is equal to three times Young’s modulus.

 

Goodrich flexometer test. Method for determining compression fatigue characteristics of rubber having a durometer hardness less than 8.5. (ASTM D-623). Results may be reported as temperature rise during continued cyclic loading, permanent set in a specified time, duration of heat buildup, maximum temperature rise or time to failure.