2 . Polystyrene ( Styrone )
The monomers are styrene molecules . It is thermoplastic . It is used for making toys , radio and TV cabinets
3 . Polyvinylchloride ( PVC )
It is used for making rain coats , toys , electrical insulation . It is hard and resistant to heat and chemicals .
4 . Polypropylene ( PP )
It is obtained by polymerising propylene in the presence of Ziegler-Natta catalyst .