... % Application: Good flexibility, for punching seals, washer etc.Rubber Type including: Natural rubber / SBR, Neoprene, NBR, EPDM, Butyl, Sillicon, ... black, green, red, white, grey, or others). Insertion rubber sheeting with one or two / multiple plies are also ... good electric performance, lightest rubber. Butyl Rubber Sheet: Low permeability, good anti-aging. Sillicon Rubber Sheet: Excellent oil and ...