About: http://webisa.webdatacommons.org/417546758

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 many cases, it is necessary to add curing agents such as organic peroxides or (in the case of natural rubber) sulfur to achieve cross-linking.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com