Thermoforming.
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The "acrylic" actually applies to several resins that are derived from acrylic acid, methacrylic acid or other related compounds. For example:
Poly(methyl methacrylate) is a thermoplastic often used in place of glass - sometimes for its light weight and sometimes for its shatter resistance.
Poly(methyl acrylate) is a white rubber at room temperature.
By contrast acrylamide and acrylonitrile acrylics tend to be thermosetting.
Acrylic is a thermoplastic. Thermoplastics can be repeatedly softened by heating and hardened by cooling.
Polyethylene is a thermoplastic polymer.
Polyvinyl chloride is a thermoplastic polymer.
Acrylic is a thermoplastic
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.
Polystyrene is a very poor conductor of heat. This is why its used as an insulator in some products.