About: http://webisa.webdatacommons.org/33363048

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 the presence of a chemical blowing agent; that is, a material which is instable at an elevated temperature, providing a foaming gas such as carbon dioxide or nitrogen.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es