Pipe Insulation Insulation Material Buna-N Rubber/PVC Installation Style Unslit Inside Diameter 5/8 in Wall Thickness 1 in Overall Length 6 ft Minimum Operating Temperature -297 Degrees F Maximum Operating Temperature 220 Degrees F Facing Material Unfaced Color Black R Value 7.2 Form Tube For Copper Tube Size 5/8 in For Pipe Size 3/8 in Flame Spread Index 47 Smoke Developed Index 72 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible