Foam plastic is also called porous plastic. A plastic made of resin as the main raw material with numerous micropores inside. Lightweight, thermal insulation, sound absorption, shockproof, corrosion resistant. There are soft and hard points. Widely used as heat insulation, sound insulation, packaging materials and car and ship shells.
Compared with pure plastic, foam plastic has low density, light weight and high specific strength. Its strength increases with the increase of density. It has the ability to absorb impact loads, has excellent shock absorption performance, sound insulation and sound absorption performance, and thermal conductivity Low, good thermal insulation performance, excellent electrical insulation performance, corrosion resistance and mold resistance. Flexible foam has excellent elasticity and other properties.
Plastic with many tiny pores inside. It is made by mechanical method (into air or carbon dioxide to foam while mechanical stirring) or chemical method (adding foaming agent). There are two types: closed-cell type and open-cell type. The pores in the closed-cell type are isolated from each other and have buoyancy; the pores in the open-cell type are connected to each other without buoyancy. It can be made of polystyrene, polyvinyl chloride, polyurethane and other resins. It can be used as heat insulation and sound insulation materials, and has a wide range of uses.