Pipe Insulation Insulation Material EPDM Installation Style Unslit Inside Diameter 1 3/8 in Wall Thickness 1 in Overall Length 6 ft Minimum Operating Temperature -297 Degrees F Maximum Operating Temperature 300 Degrees F Facing Material Unfaced Color Black R Value 4.08 Form Tube For Copper Tube Size 1 3/8 in For Pipe Size 1 in Flame Spread Index 20 Smoke Developed Index 50 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible For Tube Outside Diameter 1 3/8 in