Good -quality color steel or aluminum foil board, filled with high-density polyurethane (The density can reach 40kg/ ... garage door, roof, wall, anti-fire, sound absorbing etc, with good performance on energy conservation, environmental protection and construction. We brought in ... so it is the ideal insulated material for freezer.3. Good chemical resistance, waterproof, anti-corrosion, insect-free etc.4 ...