A thermoplastic is a material, usually a plasticpolymer, which becomes more soft when heated and hard when cooled. Thermoplastic materials can be cooled and heated several times without any change in their chemical or mechanical properties. When thermoplastics are heated to their melting point, they melt to a liquid. They freeze to a glassy state when cooled below their glass transition temperature. view more...
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Watch Workers Assemble Fireproof Thermoplastic Helmets For Firefighters