Foam is a plastic product made of resin with numerous tiny bubbles inside. Modern technology can literally process all thermosetting and thermoplastic resins into foam. At present, the primary varieties of foamed plastics are polyurethane, polyphenylene, polyethylene, polyvinyl chloride and urea formaldehyde.

Foam with low density, low thermal conductivity, low hygroscopicity, resilience characteristics such as good thermal insulation and sound-absorbing insulation, therefore, widely used for sound insulation in the building materials, widely used as thermal insulation materials in refrigeration, in aspects such as instruments and meters, household appliances and technology is widely used as earthquake moisture-proof packaging materials, homework is often used as a floating materials in water.

Foam plastics can be divided into low foaming, medium foaming and high foaming foam materials according to its foaming ratio, generally speaking, the density of low-foaming foam plastics is greater than 0.4g/cm '; The density of medium foamed plastic was 0.1~0.4 g/cm3. The density of high foam plastics is lower than 0.1g/cm3.

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