... 300% Application: Good flexibility, for punching seals, washer etc.Rubber Type including: Natural rubber / SBR, Neoprene, NBR, EPDM, Butyl, Sillicon, Viton ... resistant, good electric performance, lightest rubber. Butyl Rubber Sheet: Low permeability, good anti-aging. Sillicon Rubber Sheet: Excellent oil and fats resistance ... 60~150-120~260-50~300 The best quality of different size silicone rubber sheet