The most common commercial polypropylene has a level of crystalline structure between low density polyethylene (LDPE) and high density polyethylene (HDPE). The Young's modulus (modulus of elasticity) is also moderate. However, it is less hard than LDPE and much less brittle than HDPE. This allows the use of polypropylene as a substitute for engineering plastics such as ABS. Polypropylene has very good resistance to fatigue.

Low cost and has good impact resistance. Friction coefficient is low and provides very good electrical insulation. Chemical resistance is good. Suitable for all thermoplastic machining operations. The melting temperature of polypropylene is around 160 degrees Celsius.