About: http://webisa.webdatacommons.org/207289437

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	To further improve compatibility, in particular relative to elements other than zinc, in particular fluorine, it is advantageous to limit the aluminum content of the silica of the invention to a maximum of 500 ppm.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com