About: http://webisa.webdatacommons.org/324798999

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	However, materials having low coefficients of thermal expansion, such as silica glass, ceramics, special alloys, and the like, are hard to process or expensive.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com