<http://webisa.webdatacommons.org/prov/283878560>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/116910362> .
<http://webisa.webdatacommons.org/116910362>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/116910362>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/116910362>	<http://www.w3.org/ns/prov#value>	"Thus in one embodiment of the invention the material used is a polymeric material containing a foaming agent when moulding which, upon cooling, solidifies to form a relatively dense foam between substantially imperforate skins." .