Assertion: polypropylene | /r/HasProperty | stiff
Facets:
Source sentences:
text: By contrast, polypropylene is stiff and hard, while polyethylene is soft and pliable.
text: Polypropylene has excellent chemical resistance, is strong, and has the lowest density of the plastics used in packaging.
text: Polypropylene (PP) is a strong yet flexible plastic that can withstand high temperatures up to 200 degrees C. PP is manufactured from propylene gas in presence of a catalyst such as titanium chloride.