Rigid polyurethane foam, referred to as polyurethane rigid foam, is second only to polyurethane soft foam in polyurethane products. Polyurethane rigid foam is mostly closed-cell structure, with excellent thermal insulation effect, light weight, high specific strength, convenient construction, etc. It also has high temperature resistant foam with sound insulation, shockproof, electrical insulation, heat resistance, cold resistance and solvent resistance. .

Polyurethane foam is the most important part of various polyurethane products. Its main feature is its porosity, so its relative density is small and its specific strength is high. Depending on the raw materials used and the formulation changes, it can be made into soft, semi-rigid and rigid polyurethane foams; if classified according to the polyols used, it can be divided into polyester, polyether and castor oil polyurethane foams. Plastics, etc.; if it is classified according to its foaming method, it has a type of block, molded and sprayed polyurethane foam.

The polyurethane rigid foam is generally foamed at room temperature, and the molding process is relatively simple. According to the degree of construction mechanization, it can be divided into manual foaming and mechanical foaming; according to the pressure during foaming, it can be divided into high pressure foaming and low pressure foaming; according to the molding method, it can be divided into casting foaming and spray foaming.