Question

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Answer 1

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✧☞-1)Such resins are characteristically durable thermosetting plastic used in high pressure decorative laminates such as Formica, melamine dinnerware, laminate flooring, and dry erase boards. ... However, melamine is much more expensive to produce than are other common nitrogen fertilizers, such as urea.

-2Thermoplastic

A plastic which can be softened repeatedly by heating and can be moulded into different shapes again and again is called thermoplastic. They are flexible so can be bent easily. They are known as thermo softening plastics.Mar 20,

-3 synthetic fibre are more durable

-4Enclosures made from injection molded plastics are most commonly used for battery packs. For these enclosed pack designs, two or more plastic parts are molded and then assembled with the pack and accompanied circuitry. They can be sealed using glue, mechanical fasteners (Screws) or ultrasonic welding.

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Answer 2

Explanation:

1. Melamine is an example of thermosetting plastic.
2. Thermoplastic which can be softened once moulded into a shape.
3. Synthetic fibres are highly durable.
4. Polypropylene plastic is used for making battery cover.