Pipe Insulation Insulation Material Fiberglass Installation Style Slit with Adhesive and Flap Inside Diameter 1 25/64 in Wall Thickness 2 in Overall Length 3 ft Minimum Operating Temperature 0 Degrees F Maximum Operating Temperature 1 000 Degrees F Jacket Material ASJ Facing Color Tan R Value 16.8 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 Not Applicable Plenum Rating Plenum Rated