... , EPDM 2) Model:TC,TB,TA,SC,SB,MG,etc valve stem seal features: 1) Materials: NBR, NR, FPM, MVQ, EPDM ... design the formula according to clients` requirement.)Rubber compoundCan be UL, FDA, ROSH, REACH approvedHardness30 to 90°(tolerance can be ±3 ...