ABSTRACT
There are two stages in the process of becoming familiar w ith plastics. The first is rather general and
involves an introduction to the unique molecular structures of polym ers, their physical states, and
transitions which have marked influence on their behavior. These have been dealt w ith in Chapter 1. The
second stage, which will be treated in this chapter, is more specific in that it involves a study of the specific
properties of plastics which dictate their applications. Besides the relative ease of molding and
fabrication, many plastics offer a range of important advantages in terms of high strength/weight
ratio, toughness, corrosion and abrasion resistance, low friction, and excellent electrical resistance. These
qualities have made plastics acceptable as materials for a wide variety of engineering applications. It is
important therefore that an engineer be aware of the performance characteristics and significant
properties of plastics.