Pipe Insulation Insulation Material Mineral Wool Installation Style Slit Inside Diameter 8 1/2 in Wall Thickness 2 in Overall Length 3 ft Minimum Operating Temperature 0 Degrees F Maximum Operating Temperature 1 200 Degrees F Facing Material Unfaced Color Green R Value 8.7 Form Tube For Copper Tube Size 8 1/2 in For Pipe Size 8 in Flame Spread Index 25 Foam Cell Type Open Plenum Rating Plenum Rated Flexibility Rigid For Tube Outside Diameter 8 1/2 in