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Q. What do you mean by Thermosetting plastics?
This plastic undergoes a number of chemical changes on heating and cure to infusible and practically insoluble articles. The chemical change is not reversible thermosetting plastics do not soften on reheating and can not be reworked. They rather become harder due to completion of any left-over polymerization reaction. Eventually, at high temperatures, the useful properties of the plastic get destroyed. This is called degradation. The commonest thermosetting plastics are: alkyds, epoxides, polyesters, phenolics and urea.
Q. Explain the Cushion Materials which used in moulding sand? These materials when added to the moulding sand burn and from gases when the molten metal is poured into the mould
examples of two property rule
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Manifolds The surface of a solid must satisfy some conditions so that the resulting solid is well-behaved. This is the so-called manifold condition. While recent research has s
Basic Troubleshooting of Motorcycle we have studied about the basic troubles in motorcycle operation and their solutions. It will help you in finding out the problem with the vehic
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Determine the moment of resistance of the beam: A circular beam of diameter 100 mm is subjected to bending. The maximum bending stress is restricted to 50 N/mm 2 . Determine t
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methods in surface development
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