About: http://webisa.webdatacommons.org/141191637

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	Also in a preferred embodiment, the particles are rigid and comprise a polymeric material, such as polystyrene.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com