Class 8 Science – Chapter 3
Synthetic Fibres and Plastics
Final Revision Sheet

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🔹 Key Concepts

• Synthetic fibres are man-made fibres prepared from chemicals.
• Rayon is called artificial silk.
• Nylon was the first fully synthetic fibre.
• Polyester and Acrylic are commonly used synthetic fibres.

🔹 Types of Synthetic Fibres

• Rayon: Made from wood pulp
• Nylon: Strong, elastic, light
• Polyester: Wrinkle resistant
• Acrylic: Artificial wool

🔹 Plastics

• Plastics are polymers.
• They are light, strong, durable and corrosion resistant.
• Non-biodegradable in nature.

🔹 Types of Plastics

• Thermoplastics: Can be bent again (PVC, Polythene)
• Thermosetting Plastics: Cannot be reshaped (Bakelite, Melamine)

🔹 Plastics & Environment

• Plastics cause soil, water and air pollution.
• Burning plastics releases toxic gases.
• Use Reduce, Reuse, Recycle principle.

🔹 Exam Tips

• Learn differences clearly.
• Remember examples of fibres and plastics.
• Environmental questions are important.

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🌱 Revise once before exam = Strong confidence + High marks!