Polyurethane foam is a polymer made of isocyanate and polyether as the main raw materials, under the action of foaming agents, catalysts, flame retardants and other additives, mixed by special equipment, and foamed on site by high-pressure spraying. Polyurethane foam includs flexible foam, rigid foam and semi-rigid foam. Semi-rigid foam and flexible foam are open-cell structures mostly, and rigid foam is closed-cell structures mostly.

Polyurethane rigid foam is a new type of synthetic material with thermal insulation and waterproof function, with excellent thermal insulation , light weight, greater specific strength, convenient construction characteristics ,etc., and also with the characteristics of sound insulation, shockproof, electrical insulation, heat、cold and solvent resistance. Widely used in refrigerators, freezers cabinet insulation layer, cold storage, refrigerated trucks and other thermal insulation materials, buildings, storage tanks and pipeline insulation materials, a small amount for non-thermal insulation, such as imitation wood, packaging materials, etc.

Polyurethane flexible foam is a kind of foam plastic with certain elasticity, which is the largest used polyurethane product. It has the characteristics of light and soft, good resilience, low relative density, high specific strength, sound absorption, breathability and heat preservation. The main products are high resilience foam (HRF), block sponge, slow resilience foam, integral skin foam, etc. Widely used in furniture cushions, mattresses, transportation seat cushions and other cushions; Industrial and civil also used flexible foam as filter materials, sound insulation materials, shockproof materials, decorative materials, packaging materials and heat insulation materials.

Polyurethane semi-rigid foam is a kind of foam with properties between flexible foam and rigid foam, with high compressive load value and high density characteristics, and its crosslinking density is much higher than flexible foam and second only to rigid foam. These characteristics determine that it is not suitable for seat cushion materials, mainly used for shock absorption and energy-absorbing materials.