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A thermoplastic is a material which becomes soft when heated and hard when cooled. Thermoplastic materials can be cooled and heated several times. They can be recycled. When thermoplastics are heated, they melt to a liquid. They also freeze to a glassy state when cooled enough.
Thermoplastics and thermoplastic materials have many features. Some products made from thermoplastic materials are used for electronics applications. They protect against electrostatic discharge and radio frequency interference. Thermoplastics are one of the main two types of plastics.