Pipe Insulation, Insulation Material Fiberglass, Installation Style Slit with Adhesive and Flap, Inside Diameter 4 17/32 in, Wall Thickness 1 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 8.6, Form Tube, For Pipe Size 4 in, Flame Spread Index 25, Smoke Developed Index 50, Foam Cell Type Not Applicable, Plenum Rating Plenum Rated, Flexibility Not Applicable