General Science

  • 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

Cars & Driving

  • 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.