... . 1. Materials advice: silicone and rubber (EPDM, also NBR, SBR, CR, NR, etc),as your request , Environmental Friendly, ... tolerance can be +/-5 shore A, for some special products, we can reach +/-3 shore A tolerance.7. Excellent ... and fuel, water, weathering and Ozone resistance etc. Item nameCustom Rubber ProductSizeCustomized/standard and nonstandardBrand NameRubber ProductMaterialNBR,HNBR,EPDM, ...