About: http://webisa.webdatacommons.org/163345764

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	In other embodiments the additive may be an abrasive, such as silica or alumina, although other abrasives known to one skilled in the art may be used as well.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com