Pipe Insulation Insulation Material Fiberglass Installation Style Slit with Adhesive and Flap Inside Diameter 2 5/32 in Wall Thickness 2 in Overall Length 3 ft Minimum Operating Temperature 0 Degrees F Maximum Operating Temperature 1 000 Degrees F Facing Material ASJ Facing Color Tan R Value 16.1 Form Tube For Copper Tube Size 2 1/8 in For Pipe Size Not Applicable Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Not Applicable Plenum Rating Plenum Rated