About: http://webisa.webdatacommons.org/116882800

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 contact surface can be made of any suitable porous material, for example, metal compositions such as copper, brass, and Monel metal; ceramic compositions such as alumina silicate; or a metal-ceramic composition can be used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es