sealing o shape ring ShoreA50,60,70,80,90 black,white,red,green,yellow, ... resistance, acid/alkali resistance, weather resistance, abrasion resistance, voltage resistance and insulating resistance etc.SizeAS568, P.G Series, ISO 361/1and ... , UL, TZW, ACS, FDAMaterialAll raw material meet European REACH, ROHS and PFOS commands. Partial meet PAHS,NP requirement.NBR,EPDM,FKM ...