Rubber Seal(NBR,SBR,EPDM) 1.rubber,silicone seal 2.Nonstandard, custom- ... trial order is also welcomed before mass production(NR,BR,NBR,SBR,CR,EPDM etc) rubber seal Features:1. Materials advice: ... silicone and rubber (EPDM, also NBR, SI, HNBR, SBR, CR, BR, IIR, NR, etc),as your request ... inside, strength carton outside, or as your request. (NR.NBR.SBR.EPDM etc) rubber seal