... FKM, FPM, etc.2. Characteristics: good physical and chemical properties flat o-ring. 3. Hardness: 30~90 shore A or IRHD ... you need detailed information about AS568, JS, BS, metric o rings. 7. Material approved: Can meet RoHS, REACH,PAHS, PFOS, ... , FDA, NSF, KTW, WRAS, LFGB, etc. 8. Applications: automobile flat o-ring, electrical appliance, mechanical, industrial, construction, household, medical and ...