Polypropylene has an intermediate level of crystallinity between that of low-density polyethylene (LDPE) and high-density polyethylene (HDPE).
Polypropylene
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Polypropylene is normally tough and flexible, especially when copolymerized with ethylene. This allows polypropylene to be used as an engineering plastic, competing with materials such as ABS.
Polypropylene is reasonably economical, and can be made translucent when uncoloured but is not as readily made transparent as polystyrene, acrylic, or certain other plastics.
It is often opaque or colored using pigments. Polypropylene has good resistance to fatigue.