Assertion: polypropylene's use | /r/HasProperty | polyethylene
Facets:
Source sentences:
text: Today there are primarily seven commodity polymers in use: polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate (PET, PETE), polystyrene, polycarbonate, and poly(methyl methacrylate) (Plexiglas).