About: http://webisa.webdatacommons.org/178858761

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	The pH value may be adjusted within the regular coating process to values of e.g. 4.0 or 4.2 minimum, preferably by adding a fluoride containing compound, which may be in a water soluble form, to cut the pH value down to e.g. 4.2.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com