Soap, Detergents and Polymers: Comparison of Natural Rubber and Vulcanized Rubber (For CBSE, ICSE, IAS, NET, NRA 2022)

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Comparison of Natural Rubber and Vulcanized Rubber

Comparison of Natural Rubber

Synthetic Rubbers

  • Synthetic high polymers possessing similar physical properties as that of natural rubber are called synthetic rubber.
  • Some synthetic rubbers are made by polymerization of only one monomer, for example Neoprene is made by polymerization of chloroprene, while synthetic rubbers like Buna-S, Buna N and Butyl rubber etc. are copolymers as these have more than one monomer.


This synthetic rubber resembles natural rubber in its properties. It is obtained by polymerization of chloroprene.

Natural Rubber: Neoprene


  • making belts, hoses, shoe heals, stoppers, etc.
  • manufacture of containers for storing petrol, oil and other solvents.

Buna – S

In Buna – S, Bu stands for butadiene, Na for sodium and S stands for styrene. It is also called S. B. R. (Styrene Butadiene Rubber) . It has slightly less tensile strength than natural rubber.

Buna - S


  • making automobile tires.
  • rubber soles, belts and hoses etc.

Buna – N

  • It is obtained by copolymerization of two parts of butadiene and one part of acrylonitrile in presence of sodium metal.
  • Buna – N is hard and extremely resistant to the swelling action by oils (petrol) , solvents and is resistant to heat, etc.


  • It is used for the manufacture of storage tanks for solvents and
  • For making oil seals.

Butyl Rubber

This is obtained as a result of co-polymerization of butadiene and isobutylene.

Butyl Rubber


  • It is used for making inner tubes of tires and
  • For making conveyor belts, tank linings and insulation of high voltage wires and cables etc.

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