what are the advantages of using polymers rather than metals in car manufacture?

Answer 1

Polymeric materials are, generally, less dense than metals, and thus a piece made from polymers weighs less than the same item made from metal. Often, they are also less expensive.

This weight reduction improves fuel economy by making the car lighter, so less gas is needed to get the car to the same speeds.

In addition, the reduced price makes autos more affordable.

Answer 2

There are several advantages of using polymers in place of metal in general. Polymeric materials are, generally, less dense than metals, and thus a piece made from polymers weighs less than the same item made from metal.
Polymers generally do not form sharp ages on accidents, thus reduces the risk of injuries in case of accidents.
Smooth and comfortable finish is much easy in case of polymers.
Chlorinated polymers do not catch fire.
Most polymers are free from effects of whether.
Easy to mold or replace.
In most case Polymers are also less expensive.