TYRES

QUS. :- WHY THE TYRES OF THE AUTOMOBILES ARE ALWAYS 
BLACK IN COLOUR ?

ANS:- It is our common experience that we find the tyres of
cycles, cars, bikes and other heavy vehicles are black
(dark) in colour.

The tyres of the above vehicles should possess certain important qualities.
Basically all the tyres are made from rubber.But while making tyres the manufacturers will mix certain other substances in the rubber.

They mix 35% 'Butagene rubber' which will give enough strength to the tyres to with stand the frictional forces.

In addition to the substances, they add 65% of 'Carbon black' which gives the tyres the necessary rigidness further, they add processing oil, production wax to the rubber and make the tyres.

THE BLACK CARBON AND SILICA WHICH WILL BE IN GREATER AMOUNTS IN THE TYRES WILL PRODUCE A BLACK SUBSTANCE DUE TO WHICH THE TYRES WILL POSSES BLACK COLOUR.