Pipe Insulation Insulation Material Buna-N Rubber/PVC Installation Style Slit with Adhesive and Flap Inside Diameter 3 5/8 in Wall Thickness 1 in Overall Length 6 ft Minimum Operating Temperature -70 Degrees F Maximum Operating Temperature 220 Degrees F Jacket Material Unfaced Color Black R Value 6.1 Form Tube For Copper Tube Size 3 5/8 in For Pipe Size Not Applicable Flame Spread Index 114 Smoke Developed Index 139 Foam Cell Type Closed Plenum Rating Plenum Rated