EPDM small o rings ShoreA50,60,70,80,90 black,white, ... .etc.AdvantageGood Ozone resistance, aging resistance, high/low temperature resistance, acid/alkali resistance, weather resistance, abrasion resistance, voltage resistance and insulating ... , ROHS and PFOS commands. Partial meet PAHS,NP requirement.NBR,EPDM,FKM,ACM,IIR,Silicon rubber etc. are available.Material usage ...