Q. What is thermoplastic plastics?

These plastic soften under heat, harden on cooling, and can be resoften under heat. Thus, they retain their fusibility, solubility, and capability of being repeatedly shape. The mechanical properties of these plastics are rather sensitive to temperature and to sunlight and exposure to temperature may cause thermal degradation. Common thermoplastic plastics are: acrylics, poly tetra fluoro ethylene (PTFE), polyvinyl chlorides (PVC), nylons, polyethylene, polypropylene, polystyrene etc,