Pipe Insulation Insulation Material Polyethylene Installation Style Semi-Slit Inside Diameter 1 3/8 in Wall Thickness 3/4 in Overall Length 6 ft Minimum Operating Temperature -160 Degrees F Maximum Operating Temperature 200 Degrees F Jacket Material Unfaced Color Black R Value 3.9 Form Tube For Copper Tube Size 1 1/4 in For Pipe Size 1 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible