Pipe Insulation Insulation Material Fiberglass Installation Style Slit with Adhesive and Flap Inside Diameter 1 59/64 in Wall Thickness 1/2 in Overall Length 3 ft Minimum Operating Temperature 0 Degrees F Maximum Operating Temperature 850 Degrees F Facing Material ASJ Facing Color White R Value 2.2 Form Tube For Copper Tube Size 1 1/2 in For Pipe Size 1 1/2 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Open Plenum Rating Plenum Rated Flexibility Rigid