Rigid polyurethane foam is a new type of low temperature which uses polyether or polyester and polyisocyanate as main raw materials, plus flame retardant, stabilizer and foaming agent, and reacts to form a foam by mixing and stirring. Insulation materials. The foam has a high closed cell ratio and low water absorption.

    Because of its low thermal conductivity foaming agent gas in the pores, it has a certain self-extinguishing property, and is commonly used for heat preservation in the cold preservation and low temperature range. It has the advantages of small thermal conductivity, high strength, light weight, sound insulation, shock resistance, insulation, strong floating property, stable chemical properties and convenient construction. It is widely used in petroleum, chemical, ethylene, cold storage, food storage and household appliances refrigerators. Used in industries such as partition walls and siding in the construction industry. When applied, it can be prefabricated into prefabricated products such as plates or shells, or it can be sprayed or perfused on site.