Pipe Insulation Insulation Material Polyethylene Installation Style Slit with Adhesive Inside Diameter 1 3/8 in Wall Thickness 3/8 in Overall Length 6 ft Minimum Operating Temperature -160 Degrees F Maximum Operating Temperature 200 Degrees F Jacket Material Unfaced Color Black R Value 1.9 Form Tube For Copper Tube Size 1 3/8 in For Pipe Size 1 in Flame Spread Index 25 Smoke Developed Index 50 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible