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(1) The plastics that are poor conductors of heat and electricity - Thermosetting Plastics
Although ALL plastics are bad conductors of heat and electricity, it is the thermosetting plastics that are best insulators of heat and electricity. That is why objects which require fire or electric resistance, like coats of firemen, cookware and electrical switches, have thermosetting plastic.
2) Plastics which when moulded once, cannot be softened by heating - Thermosetting Plastics
The units of thermosetting plastics are arranged in a crosslinked manner. This arrangement forms a strong bond among the units which does not allow them to be bent easily or remoulded. They are used to make handles of utensils and strong objects like chairs and tables.
3) The plastic which gets deformed easily on heating and can be bent easily - Thermoplastics
Unlike the crosslinked arrangement in thermosetting plastics, thermoplastics have a linear arrangement of units, thus allowing objects made of them to be easily bent and deformed. This property of thermoplastics makes them recyclable. They are used to make carry bags, toys, bottles and containers.
Plastics
Plastics are polymers made by man to fulfill the needs of various useful objects. From a toothbrush to the parts of a car, plastic is used almost everywhere. It is:
- light weighted
- cheap
- easy to produce and carry
- widely available
- durable
- soft
- insulator of heat and electricity
There are two types of plastics:
⇒ Thermoplastics, which have a linear linkage that makes them easily remouldable.
⇒ Thermosetting plastics, which have a cross linkage and cannot be moulded more than once.