A porous polyurethane material composed of a large number of micropores and polyurethane resin pore wall meridians is generally called "polyurethane foam", and in English it is called "polyurethane foam" or "cellular polyurethane".

Polyurethane foam is one of the most commonly used types of polyurethane materials, accounting for more than 50% of polyurethane products. It accounts for about 55% of polyurethane products in Europe, about 65% or even more than this in Asia, and even about 70% in the United States. Its main characteristics are porosity, low density and high specific strength.

Depending on the types of raw materials used and changes in the dosage of the formula, soft, semi-rigid and rigid polyurethane foams with different densities and properties can be produced for various purposes, such as various thermal insulation materials. Cushioning materials, seat cushions and mattresses, etc. In the market volume of various types of foam plastics, polyurethane accounts for more than 50%.

Compared with other foam materials, polyurethane foam has many characteristics in terms of performance. In addition to low density, it is also odorless, breathable (soft foam), high thermal insulation (hard foam), uniform cells, aging resistant, and certain It is resistant to organic solvent erosion and has strong adhesion to metal, wood, glass, masonry, fiber, etc., which is unmatched by other foam materials, so it is welcomed by various application departments. In the field of thermal insulation material applications, polyurethane foam has occupied a solid market position.