- noun a type of plastic used to make artificial fibres, bottles, pipes, and other articles, which is not degradable and must be recycled or destroyed by incineration
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- noun an extremely versatile plastic, available in many grades and also as a copolymer (ethylene/propylene).
- A tough plastic with good resistance to heat and chemicals. Polypropylene is a polymer of propylene, and is found in everything from packaging to molded automobile parts.
- A synthetic and tough thermoplastic material which is made via the polymerization of propylene, whose chemical formula is C3H6. It is water-resistant, oil-resistant, is used as an insulator and dielectric, and in molded articles such as containers.