Polypropylene implies, the monomer used for polymerisation does not consist of ethylene but propylene.
In relation to polypropylene, the different molecular structure of polypropylene produces an even greater hardness and rigidity. The durability to impact, primarily at low temperatures is not as good as that of polyethylene. But the high resistance to chemicals, even solvents, is often decisive for the use of polypropylene as opposed to other materials.
It must be noted that PP is sensitive to copper, manganese, cobalt and their alloys. These metals reduce the durability of all PP types, especially at high temperatures. For this reason, contact with them should be avoided.