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Urea formaldehyde shares properties and applications with which other thermoset?

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Urea formaldehyde shares properties and applications with which other thermoset?

(a) Phenol formaldehyde

(b) Polyurethane

(c) Epoxide

(d) Melamine formaldehyde

This question was addressed to me during an interview.

Query is from Thermosetting Plastics, Particle Reinforced Composites in division Non Metallic Materials of Engineering Material & Metallurgy

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Right option is (d) Melamine formaldehyde

The explanation: Urea and melamine formaldehyde are materials having good hardness, rigidity, and resistance to chemicals. They are both types of amino-formaldehyde materials. Melamine differs from urea formaldehyde due to its heat resistance property, which is higher than that of ureas.

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