Polypropylene is a polymer from the polyolefin group. It is manufactured by means of low-pressure polymerisation of propene. It is one of the most commonly used plastics, usually denoted with the characteristic PP symbol.
Polypropylene is a hydrocarbon-based thermoplastic polymer, which means it can be changed into a highly flexible state by increasing the temperature, then re-solidified by reducing the temperature without changing its chemical properties. There is atactic, isotactic, and syndiotactic propylene, with the denomination depending on the polymerisation conditions and the type of catalyst used. These types differ in the final properties of the resulting material.
Among different polymers, polypropylene displays the lowest density, while having a high thermal resistance, especially at room temperature. Polypropylene and its composites are processed primarily using such methods as extrusion, blow moulding, injection moulding, vacuum moulding, and thermal moulding. It is used in many industries, such as food and packaging, chemical, furniture, and automotive.
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