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Polypropylene is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerisation from the monomer propylene. Polypropylene belongs to the group of polyolefin and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat resistant. It is a white, mechanically rugged material and has a high chemical resistance. Polypropylene is the second-most widely produced commodity plastic and is often used in packaging and labelling. In 2013, the global market for polypropylene was about 55 million tonnes.