About: http://webisa.webdatacommons.org/214318334

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 basic materials may be inorganic oxides and salts such as sodium hydroxide, calcium oxide and sodium sulfide.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com