Pipe Insulation Insulation Material Polyethylene Installation Style Semi-Slit Inside Diameter 2 in Wall Thickness 1/2 in Overall Length 6 ft Minimum Operating Temperature -160 Degrees F Maximum Operating Temperature 200 Degrees F Facing Material Unfaced Color Black R Value 2.5 Form Tube For Copper Tube Size Not Applicable For Pipe Size 1 1/2 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Not Applicable Plenum Rating Plenum Rated Flexibility Not Applicable