About: http://webisa.webdatacommons.org/407255038

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 swellable material expands to form an expanded, material 18 d that holds the ring in position in the casing such that the pin ends of the casing joints, for example casing joint 12 c, may be threaded in against it.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com