Pipe Insulation Insulation Material Buna-N Rubber/PVC Installation Style Unslit Inside Diameter 2 3/8 in Wall Thickness 1/2 in Overall Length 6 ft Minimum Operating Temperature -297 Degrees F Maximum Operating Temperature 220 Degrees F Jacket Material Unfaced Color Black R Value 2.7 Form Tube For Copper Tube Size Not Applicable For Pipe Size 2 in Flame Spread Index 28 Smoke Developed Index 53 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible