Vacuum forming is one of the most common methods of processing plastic. The vacuum forming process involves heating a sheet of plastic until it is soft.
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Polyethylene is a thermoplastic polymer.
Polyvinyl chloride is a thermoplastic polymer.
Polythene, also known as polyethylene, is a thermoplastic, not a thermosetting plastic. Thermoplastics can be reheated and reshaped multiple times without affecting their properties, while thermosetting plastics undergo a chemical change during heating and cannot be reshaped once set.
thermosetting plastic
Polystyrene is a very poor conductor of heat. This is why its used as an insulator in some products.