Is Polyurethane Foam Open Cell or Close Cell?

 

Rigid polyurethane foam has a closed-cell structure, while soft polyurethane foam has an open-cell structure.

 

Rigid polyurethane foam is referred to as rigid polyurethane foam, and its consumption in polyurethane products is second only to flexible polyurethane foam.
 

Polyurethane rigid foam is mostly closed-cell structure, which has excellent thermal insulation effect, light weight, high specific strength, convenient construction, etc. It also has the characteristics of sound insulation, shock resistance, electrical insulation, heat resistance, cold resistance, solvent resistance, etc. It is widely used in Structural rigid support, filling of design gaps, protective gaskets for sensitive devices, withstanding extreme environments, durability and reliability, built to last.

Among all kinds of polyurethane products, polyurethane foam plastic is the most important part. Its main feature is its porosity, so its relative density is small and its specific strength is high. According to different raw materials and formula changes, it can be made into soft, semi-rigid and rigid polyurethane foams; if classified according to the types of polyols used, it can be divided into polyester type, polyether type and castor oil type polyurethane foam Cotton plastics, etc.; according to their foaming methods, there are block, molded and sprayed polyurethane foam plastics and other types.
 

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 pouring foaming and spray foaming.

 

Polyurethane rigid foam is made of isocyanate and polyether as the main raw materials, under the action of various additives such as foaming agents, catalysts, flame retardants, etc., mixed by special equipment, and foamed on site by high-pressure spraying. polymer. Polyurethane foam has two types: soft foam and rigid foam. Soft foam has an open-cell structure, while rigid foam has a closed-cell structure. Soft foam is divided into two types: skinning and non-skinning.
 

The main function of flexible polyurethane foam is to cushion. Polyurethane flexible foam is often used in sound insulation linings such as mobile phone speakers, power modules, lampshade seals, automobiles, electronic equipment and computer communication equipment.

 

Polyurethane rigid foam is a new type of synthetic material with thermal insulation and waterproof functions. Its thermal conductivity is low, only 0.022-0.033W/(m*Κ), which is equivalent to half of the extruded board and is the thermal conductivity of all thermal insulation materials at present. lowest. Rigid polyurethane foam is mainly used for rigid support of structural parts, filling of design gaps, protective gaskets for sensitive devices, can withstand extreme environments, has durability and reliability, and is durable.