Pipe Insulation Insulation Material Fiberglass Installation Style Slit with Adhesive and Flap Inside Diameter 1 25/64 in Wall Thickness 1 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 4.35 Form Tube For Copper Tube Size 1 3/8 in For Pipe Size 1 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Open Plenum Rating Plenum Rated Flexibility Rigid