Pipe Insulation Insulation Material Fiberglass Installation Style Slit with Adhesive and Flap Inside Diameter 5/8 in Wall Thickness 1/2 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 4.5 Form Tube For Copper Tube Size 5/8 in For Pipe Size 3/8 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Not Applicable Plenum Rating Plenum Rated