... trial order before mass production. 1. Materials advice: silicone and rubber (EPDM, also NBR, SBR, CR, NR, etc),as your request ... weeks6. Color: black, transparent,red, blue,any in PMS,Especially for the silicone products.7 .Hardness: 30 to 90 shore A ... or IRHD, tolerance can be +/-5 shore A, for some special products, we can reach +/-3 shore A tolerance ...