... about EPDM rubber watch o ring: Original PropertiesUnitSPECTest MethodsValueShore A hardnessPoints60+/-5ASTM-D-224062Tensile strengthMpa14ASTM-D-41218.1Elongation%250ASTM-D-412465Tear resistanceKg-cm ASTM ... ROHS, REACH, FDA, NSF, UL, etc.7. Style: O ring, X ring, D ring, V ring, etc.8. Applications: automobile, electrical appliance ...