Question

Which of the following pairs of materials are most suited to the applications listed? Briefly explain your reasoning.

(a) Natural rubber or polybutylene/isoprene rubber for windscreen wipers

(b) Polyoxymethylene or polytetrafluoroethylene for gear cogs in a lightweight motor

(c) Polyester resin or phenol-formaldehyde for saucepan handles

(d) ABS or polypropylene for refrigerator linings

Answer 1

Answer -

a) Natural rubber is most suitable for windscreen wipers beacuse of its high elasticity properties, high tensile strength and very good abrasion resistance.

b) Poloxymethylene is most suitable for gear cogs in a lightweight motor beacuse of its low friction, chemical inertness, hardness and high tensile strength.

c) Phenol - formaldehyde is most suitbale for saucepan handles because of its good physical and electrical properties, hardness and can withstand very high temperatures.

d) ABS is most suitbale for refrigerator liners because of its chemical resistance properties, very easy to process, light weight, high dimensional stability and strength.