noun Chemistry.
a plastic polymer of propylene, (C 3 H 5 ) n , used chiefly for molded parts, electrical insulation, packaging, and fibers for wearing apparel.

1930–35; poly- + propylene

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World English Dictionary
polypropylene (ˌpɒlɪˈprəʊpɪˌliːn)
Systematic name: polypropene any of various tough flexible synthetic thermoplastic materials made by polymerizing propylene and used for making moulded articles, laminates, bottles, pipes, and fibres for ropes, bristles, upholstery, and carpets

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American Heritage
Science Dictionary
polypropylene   (pŏl'ē-prō'pə-lēn')  Pronunciation Key 
  1. Any of various thermoplastic resins that are polymers consisting of repeated branched units derived from propane and having the formula CH2CH(CH3), usually with the methane groups (CH3) all on one side of the chain. Polypropylenes are similar to polyethylenes but are harder and tougher and are used to make molded articles and fibers.

  2. A fabric of fibers made from any of these resins.

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Example sentences
Polypropylene however, is destroyed simply by burning, because its calorific
  capacity is similar to that of oil.
Polypropylene housing is light, but may not last forever.
These are mainly polyethylene but also include some types of polypropylene.
Then he started tinkering with a polypropylene box, about the size of a laundry
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