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An elastomer is a polymeric substance obtained after vulcanization of rubber. Vulcanization is the process of improving the properties of rubber by heating with sulphur. A normal rubber is not useable as it becomes brittle at low temperature and sticky at high temperature. Charles Goodyear had been trying to 'cure' the rubber so that it could be used in all seasons. He tried to mix all kinds of things such as ink, black pepper, cheese and what not. But he couldn't succeed until he dropped a piece of rubber on stove accidentally.
To his surprise, he found that instead of melting the rubber piece hardened and remained pliable. It was found in the lab that it contained traces of sulphur. Goodyear perfected the process and named it 'vulcanization' after the Roman God of fire, 'Vulcan'.
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list and explain the types of concrete mixer
first of all i want to think you for this helpful website , and let me ask you this question . how to calculate w/c ratio ? thank you so much for you .
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Q. What is Portal Cranes? The Portal crane is a hydraulically driven four wheeled machine and is meant for carrying sleepers or track panels. The power for running and working
A footing foundation for a water tower carries a load of 9000 kN and is 3.6 metres square. It rests on dense sand of 9 m thickness overlying a clay layer of 3 metres depth. The cla
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Assignment Topic grade of concrete
Explain Fluid Mechanics or Properties – Viscosity A measure of a fluid's resistance to flow when acted upon by an external force such as pressure or gravity. Also termed, "Abso
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