About: http://webisa.webdatacommons.org/61288341

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	These windows are preferably made of a material such as calcium fluoride (CaF2), sapphire, or other material that will pass light of all wavelengths of interest with little or no attenuation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca