About: http://webisa.webdatacommons.org/291731428

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	Conversely, if the silica content exceeds 35% by weight, there is a risk of the mechanical properties being detrimentally affected or the refractive index being too low.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com