About: http://webisa.webdatacommons.org/429019138

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	Examples of other polishing materials are silicon nitride, zirconium oxide, boron nitride, and emery.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com