Based on the polymerization conditions and the incorporation of the ethylene copolymer, polypropylenes can be differentiated in PP Homopolymer (PP-H),  PP Random copolymer (PP-R) and PP Block copolymer (PP-B).

The property profiles of the different types of polypropylene also make them suitable for different types of application: PP-H is normally used in industrial pressure pipe systems and for soil and waste water pipes and fittings, based mainly on its good mechanical properties and excellent chemical resistance.                      

PP-R is a well proven material in domestic pressure piping systems for hot and cold water due to its high internal pressure resistance and long lifetime at elevated temperatures.

For buried sewerage and drainage applications, waste water systems and ducting pipe systems, PP-B is the obvious choice. This is mainly due to its high  stiffness, high impact strength, especially at low temperatures, good long term properties and excellent chemical resistance. Based on these properties,  PP-B is commonly used also for other non pressure systems, in particular for soil and waste water piping systems and for cable protection systems.