About: http://webisa.webdatacommons.org/424396548

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	According to an embodiment of the invention, however, the viscoelastic layer optionally may be substantially free of fillers, especially inorganic fillers such as silica.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com