... FKM, FPM, etc.2. Characteristics: good physical and chemical properties flat o-ring. 3. Hardness: 30~90 shore A or IRHD ... ,PFOA, FDA, NSF, KTW, WRAS, LFGB, etc. 8. Applications: automobile flat o-ring, electrical appliance, mechanical, industrial, construction, household, medical and ... have thousands of current molds for o-rings. 11. Production lead time: 1~2 weeks. 12. Small order quantity is welcomed ...