Pipe Insulation Insulation Material Polyethylene Installation Style Slit with Adhesive Inside Diameter 1 5/8 in Wall Thickness 1 in Overall Length 6 ft Minimum Operating Temperature -330 Degrees F Maximum Operating Temperature 210 Degrees F Facing Material Unfaced Color White R Value 5.8 Form Tube For Copper Tube Size 1 5/8 in For Pipe Size 1 1/4 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible