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Paraplex is a common trade name for which thermoset?

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Paraplex is a common trade name for which thermoset?

(a) Epoxide

(b) Polyester

(c) Polyurethane

(d) Urea formaldehyde

I have been asked this question in final exam.

The above asked question is from Thermosetting Plastics, Particle Reinforced Composites in portion Non Metallic Materials of Engineering Material & Metallurgy

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Right option is (b) Polyester

The best I can explain: Polyesters are materials having excellent electrical properties, while also being quite cheap. Their common trade names are Selectron, Laminac, and Paraplex. They are used in safety helmets, structural panels, electrical moldings etc.

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