Assertion: polyester | /r/HasProperty | petroleum-based
Facets:
Source sentences:
text: Because polyester is petroleum-based, it has a reputation for being environmentally unsound.
text: First marketed in 1951, polyester is a petroleum-based product.
text: Because polyester is petroleum-based, I want to focus on the formation, extraction, and refining of petroleum before tackling the production of synthetic fibers.