Insulation Sheet, Insulation Material Buna-N Rubber, Insulation Color Green, Overall Length 4 ft, Overall Width 36 in, Thickness 1 in, Minimum Operating Temperature -297 Degrees F, Backing Type Adhesive, Maximum Operating Temperature 250 Degrees F, Facing Material Unfaced, R Value 4, Form Sheet, Flame Spread Index 25, Smoke Developed Index 50, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible