... : Good flexibility, for punching seals, washer etc.Rubber Type including: Natural rubber / SBR, Neoprene, NBR, EPDM, Butyl, ... green, red, white, grey, or others). Insertion rubber sheeting with one or two / multiple plies are also ... electric performance, lightest rubber. Butyl Rubber Sheet: Low permeability, good anti-aging. Sillicon Rubber Sheet: Excellent oil ... .1-1.61.4-1.71.1-1.61.3-1.71.4-1.61.351 ...