Good -quality color steel or aluminum foil board, filled with high-density polyurethane (The ... house, freezing house, clean room, garage door, roof, wall, anti-fire, sound absorbing etc, with good performance on energy ... Rating. PU reaches Grade B2 fire rating.2. Heat & Sound Insulation. Temperature suitable for PU ranges from -200+150. ... , villas, prefabricated houses etc. Cold Room Sliding Door