Pipe Insulation Insulation Material Buna-N Rubber/PVC Installation Style Unslit Inside Diameter 1 1/8 in Wall Thickness 3/4 in Overall Length 6 ft Minimum Operating Temperature -297 Degrees F Maximum Operating Temperature 220 Degrees F Facing Material Unfaced Color Black R Value 5.5 Form Tube For Copper Tube Size 1 1/8 in For Pipe Size 3/4 in Flame Spread Index 75 Smoke Developed Index 100 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible