Pipe Insulation Insulation Material Fiberglass Installation Style Slit with Adhesive and Flap Inside Diameter 2 29/32 in Wall Thickness 1 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 5.9 Form Tube For Copper Tube Size Not Applicable For Pipe Size 2 1/2 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Not Applicable Plenum Rating Plenum Rated