on the basis of the reaction of heat in plastic , their are two types of plastics :
Thermoplastic & Thermosetting plastics
Thermoplastics : Plastics which easily get deformed (become soft )on heating and also get bend easily are known as thermoplastics .
examples : polythene , polyvinyl chloride and polystyrene .
thermosetting plastics : plastics which once moulded into a shape do not become soft on heating and cannot be moulded again are called thermosetting plastics .
examples : bakelite , melamine and formica