Final answer:
Plastic glazing material can be divided into two general categories: thermoplastics and thermosets.
Step-by-step explanation:
Plastic glazing material can be divided into two general categories: thermoplastics and thermosets.
Thermoplastics are plastics that can be reformed after repeated heating. They soften when heated and harden when cooled. Examples of thermoplastics include polyethylene, polypropylene, and polystyrene.
Thermosets, on the other hand, harden permanently once they are heated and cooled. They cannot be reformed after setting. Examples of thermosets include epoxy and polyester.