GROMMET BODY MATERIAL:EPDM to ASTM D200 4MAA 510 A13 B13 C12. WEIGHT OF RUBBER PER ASSEMBLY -31g+-5g. SHORE HARDNESS:50 DEGREE+-5 TEMP RESISTANCE:-40 DEGREEto 150 TENSILE STRENGTH:9.8Mpa(MINIMUM) ELONGATION:300%(MIN.) COMPRESSION SET:75% (MIN.) HEAT AGEING:150 DEGREEX240HR