Rubber 2
Rubber 2 : Synthetic rubber, as opposed to natural rubber (obtained from the exudations of certain tropical trees), is derived from petroleum and natural gas. Because of its elasticity, resilience, and toughness, rubber is the basic constituent of the tyres used in automotive vehicles, aircraft, and bicycles. Rubber is also used in electrical insulation, and because it is waterproof, it is a favoured material for shoe soles
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