good oil seals materials :rubber,NBR,HNBR,FPM passed ISO 9000 identification good products and favorable price good services The main function of oil seal ... extraneous substances whilst maintaining lubricant for the seal lip and protecting rotating bearings.Type: SA,SB,SC,SF,SG,SM,SZ,TA ... ,KC,KF,KGKM,KZ;Material: CR,NBR,HNBR,FPM,ACM and materials according to customers special requirements.