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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.
Impulse, Momentum, Work and Energy: As a part of summary, you can remember various important principles in terms of following equations. (i) Impulse-Momentum equati
Dynamic Magnifier: This is function of frequency ratio. Forced Vibration: While the system is continuously excited by an external force or internally produced force, the v
Q. Illustrate Brinell hardness tests? Brinell hardness tests of the deposited weld, and heat affected zone shall be required for procedure qualifications of every welding proce
(a) Briefly explain the various efficiency terms associated with an engine. (b) A four cylinder engine running at 1200 rpm delivers 20 KW. The average torque when one cylinder w
There are various methods of producing components from the plastics materials which are supplied in the granular, power and other forms. Various plastics molding processes discu
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