About: http://webisa.webdatacommons.org/309484576

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 inner layer could be also made of ceramics such as alumina, zirconia, silicon carbide, silicon nitride and boron carbide.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es