Definition of polypropylene
: any of various thermoplastic plastics or fibers that are polymers of propylene
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Recent Examples of polypropylene from the Web
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The fuel for the motor is a hollow cylinder made from polypropylene, a plastic hard and strong enough to form a rocket’s outer casing.
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Grow Bag Commercial growing bags are constructed of heavy, dense polypropylene.
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The big contributors were packaging materials like polyethylene and polypropylene, paints, nylon, polyester, and cellulose acetate, primarily used in the manufacture of cigarette filters.
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Today, it’s made largely of polypropylene and is twice as strong.
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But the kinds of plastic typically used in plastic containers, like polypropylene, have a lower surface energy and are called hydrophobic.
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It is lined with a thin coating of plastic to ensure its integrity when filled with hot liquid, and topped with a polypropylene plastic lid.
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Tests on more than 250 bottles showed almost all had contamination from microplastic particles that included polypropylene, nylon, and polyethylene terephthalate (PET), according to a story in Orb, a nonprofit journalism organization.
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The not-as-bad plastics do not release BPA and count high-density polyethylene, low-density polyethylene, and polypropylene among their ranks.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'polypropylene.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of polypropylene
1935
Learn More about polypropylene
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Britannica.com: Encyclopedia article about polypropylene
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