Because of its excellent characteristics, polyurethane sandwich board can be used as external wall, internal wall partition, suspended ceiling, roof, applied to a variety of different building needs, including industrial plants, public buildings, composite housing, purification engineering, large cold storage board and other building fields. Concrete use for steel structure workshop, simple mobile room roof and wall, food frozen processing and cold storage (aquatic products, poultry, poultry, prepared food, vegetables, fruits), meat products production plant, food processing plant, prefabricated cold storage, seed storage, biological and products, dairy products storage, etc.