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Building Materials - Engineering

Q1:

Pick up the non-inflammable plastic from the following:

A Cellulose acetate plastics

B Polyvinyl chloride plastics

C Phenol formaldehyde plastic

D Urea formaldehyde plastic.

ANS:B - Polyvinyl chloride plastics

Urea-formaldehyde resin's high tensile strength, flexural modulus, and a high heat distortion temperature, low water absorption, mould shrinkage, high surface hardness, elongation at break, and volume resistance. Cellulose acetate is the acetate ester of cellulose. Less flammable, most commonly used in the manufacture of cigarette filters.