Pipe Insulation Insulation Material Buna-N Rubber/PVC Installation Style Slit with Adhesive and Flap Inside Diameter 2 in Wall Thickness 3/4 in Overall Length 6 ft Minimum Operating Temperature -70 Degrees F Maximum Operating Temperature 220 Degrees F Facing Material Unfaced Color Black R Value 4.8 Form Tube For Copper Tube Size Not Applicable For Pipe Size 1 1/2 in Flame Spread Index 80 Smoke Developed Index 105 Foam Cell Type Closed Plenum Rating Plenum Rated