Class 8 Science – Chapter 3
Synthetic Fibres and Plastics
Step 3: Plastics – Types & Properties
What are Plastics?
Plastics are synthetic materials made from polymers. They can be moulded into different shapes when heated.
Types of Plastics
1. Thermoplastics
Thermoplastics can be softened on heating and hardened on cooling. This process can be repeated many times.
- Examples: Polythene, PVC
- Used in toys, containers, bottles
2. Thermosetting Plastics
Thermosetting plastics do not soften on heating. Once moulded, they cannot be reshaped.
- Examples: Bakelite, Melamine
- Used in switches, handles, kitchenware
Properties of Plastics
- Lightweight
- Strong and durable
- Resistant to water and chemicals
- Bad conductor of heat and electricity
⭐ Plastics are useful but harmful to the environment if misused
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