<http://webisa.webdatacommons.org/prov/434430445> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/72624538> . <http://webisa.webdatacommons.org/72624538> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/72624538> <http://www.w3.org/ns/prov#value> "The matrix is preferably a curable thermosetting polymer such as an acrylic." . <http://webisa.webdatacommons.org/72624538> <http://www.w3.org/ns/prov#wasQuotedFrom> <freepatentsonline.com> .