About: http://webisa.webdatacommons.org/182231009

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Polytetrafluoroethylene is obtained by conventional means, for example, by polymerization of tetrafluoroethylene under pressure using free-radical catalysts such as peroxides or persulfates.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com