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Hexamethylene tetramine serves as a hardener for ________

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Hexamethylene tetramine serves as a hardener for ________

(a) Cellulose

(b) Polystyrene

(c) Polyvinylchloride

(d) Phenol formaldehyde

This question was addressed to me at a job interview.

I'm obligated to ask this question of Plastics in chapter Steel, Timber, Mortar, Plastics, Non-Ferrous Metals and Alloys of Construction & Building Materials

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Correct answer is (d) Phenol formaldehyde

The best explanation: Hexamethylene tetramine serves as a hardener for phenol-formaldehyde. A hardener is a compound that is used to increase the hardness of resins.

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