Insulation Sheet, Insulation Material Polyethylene, Insulation Color Black, Overall Length 4 ft, Overall Width 36 in, Thickness 1 in, Minimum Operating Temperature -330 Degrees F, Backing Type Plain, Maximum Operating Temperature 210 Degrees F, Facing Material Unfaced, R Value 4, Form Sheet, Flame Spread Index 25, Smoke Developed Index 50, Foam Cell Type Closed, Plenum Rating Plenum Rated, Flexibility Flexible, Standards ASTM C177, Clean Room Class Not Applicable Help prevent heat gain and condensation or frost formation on water and air conditioning lines with this durable TUNDRA insulation sheet. The closed cell design and flexibility is ideal for wrapping large pipes, tanks and vessels. Can be used with 320 or 620 contact adhesive or other approved sealing system.