... physical and chemical properties. Description of viton O Ring:1. Materials: can be NBR, Viton, EPDM, SI, HNBR, BUNA, ... , pink, etc. or upon your color codes.6. Applications: automobile, electrical appliance, mechanical, industrial, construction, household, medical and other fields7. Production ... ~3 weeks.8. Small order quantity is welcomed. black viton o ring for valve