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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.
Pyrolysis Pyrolysis is the procedure of depositing a ceramic on a heated substrate. The process is used to deposit coating or generate thin walled components of graphite or si
In designing rotating space stations to give for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the neg
Determines the effect of price reduction: In order to enhance the sales, management of Quality ice-cream company decided to give discounts in the sale of one and half liter pa
1. An extraction column (sketched below with the known process data) is used to remove acid from an oil stream by contacting it with pure water. It can be assumed that the oil and
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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
Spot welding of different metals Though, mild steel is t he metal most commonly used, any prime metal or alloy can be successfully spot welded provided that machine with suitab
Find out tension in the rop: Two blocks A and B are associated as shown in Figure (a). Mass of block A is 15 kg and this is resting on a surface having a coefficient of fricti
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Value engineering & Value analysis VA may be defined as looking at an existing product or a product already in production to see if changes in design or process can reduce prod
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