Insulation Sheet Insulation Material Buna-N Rubber/PVC Insulation Color Black Overall Length 4 ft Overall Width 36 in Thickness 1/2 in Minimum Operating Temperature -40 Degrees F Backing Type Adhesive Maximum Operating Temperature 200 Degrees F Facing Material Unfaced R Value 2 Form Sheet Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible