O-ring in NBR,EPDM,Silicone,Viton Shore60,70,80,90 black,white,red,green,yellow,blue NSF,FDA, ... , valve, faucet, machine, hydraumatic, pneumatic and automobiles.Shore 60±5 ; 70±5AdvantageGood Ozone resistance, aging resistance, high/low temperature resistance, acid ... meet PAHS,NP requirement.NBR,EPDM,FKM,ACM,IIR,Silicon rubber etc. are available.Material usage is based on the final ...