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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'.
principle of working from whole to part
Specification of wet mix macadam
Principles of working from whole to part
Soil Compaction: Soils used in road construction need to be thoroughly rolled and compacted. Compaction of soil is needed for the following reasons. (a) A well compacted s
what do you understand by the term local attraction
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 .
Question While designing reservoirs, indirect tensile strength of the concrete mix is particular to be less than a specific value such as 2.8N/mm2 for potable water. Why ought
Soil Classification: Based on particle size, the soils can be classified as under, adopting the IS soil classification system: 0.002 0.075 0.425 2.36 4.75
Determine the stresses within the rod: Two parallel walls are stayed together through a steel rod of 5 cm diameter passing through metal plates and nuts at both ends. The nuts
what is footing
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