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nature : for the base resin made of the internal porosity with countless tiny plastic. There are two method : (a) machinery, in forming machinery for mixing foam (with air, carbon dioxide, etc.); (2) chemical, used in forming foam frothers. According to the manufacturer obturator conditions can be divided into two types and openings. Obturator foam type of stomatal isolated, floating nature. Open-cell foam porosity of mutual connectivity, no floating nature. Under the mechanical strength can be divided into rigid, semi-rigid and soft three types. With the size and the number of stomata, the density of various products, light and water only 1%. A light, insulation, acoustic, earthquakes, humidity resistance, corrosion resistance and other advantages. Noise can be used as insulation and materials, and high-strength lightweight materials on the surface. Chemical industry pipelines and containers used for the insulating material. The construction industry used to the roof, walls and other building materials. The system is also used in the annex to the aircraft, vessel shell, lifebuoys, buoys, warm clothing and so on. If PVC foam, polystyrene foam, urea - formaldehyde foam and polyurethane foam.
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