... 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 , Environmental ... or IRHD, tolerance can be ±5 shore A, for some special products, we can reach ±3 shore A tolerance.8. High ...