What are plastics ? Give their properties and important applications.


 Ans-: Plastic is a material that shows the property of plasticity and can be moulded into any desired shape and dimensions by the application of heat and pressure.

Important properties of Plastic material

  • Low specific gravity
  • Low thermal and electrical conductivity
  • Easy to fabricate in complicated shapes and accurate dimensions by moulding process at low costs.
  • Tailorable optical, chemical and mechanical properties.
Important Applications (Example of Plastic material)

  • Mugs (Low density polyethene)
  • Overhead water tank (High density polyethene)
  • Pencil box (Polypropylene)
  • Audio-casettes (Polystyrene)
  • Baby feeding bottles (Polycarbonate)
  • Bristles for tooth brushes (Nylon)
  • Bottles for household liquid (PVC)
  • Non-stick cookware (Teflon)
  • Coloured toilet sheets (Urea Formaldehyde resins)
  • Bottles for cold drinks, fruit juice, beers (PET)

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