Pipe Insulation Insulation Material Buna-N Rubber Installation Style Unslit Inside Diameter 5/8 in Wall Thickness 3/4 in Overall Length 6 ft Minimum Operating Temperature -297 Degrees F Maximum Operating Temperature 250 Degrees F Facing Material Unfaced Color Green R Value 5.3 Form Tube For Copper Tube Size 5/8 in For Pipe Size 3/8 in Flame Spread Index 126 Smoke Developed Index 151 Foam Cell Type Closed Plenum Rating Plenum Rated Flexibility Flexible