Pipe Insulation Insulation Material Buna-N Rubber/PVC Installation Style Unslit Inside Diameter 2 in Wall Thickness 3/4 in Overall Length 6 ft Minimum Operating Temperature -297 Degrees F Maximum Operating Temperature 220 Degrees F Jacket Material Unfaced Color Black R Value 4.5 Form Tube For Copper Tube Size Not Applicable For Pipe Size 1 1/2 in Flame Spread Index 37 Smoke Developed Index 62 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible