'Rubber Sheet, Air Tight, General Purpose Grade, Butyl Rubber, Thickness 1/8 In, Width 12 In, Length 12 In, Black, Smooth Finish, Non Adhesive Backing Type, Min Temp Rating -40 F, Max Temp 225 F, Durometer 60A, Elongation 300%, Tensile Strength 1200 PSI, Standards ASTM D2000 AA'