About: http://webisa.webdatacommons.org/34805063

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	The hard filler in the base section was quartz in many of the examples, being the material referred to commercially as flint, but other fillers could be used such as aluminum oxide or silicon carbide.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au