| http://www.w3.org/ns/prov#value | - Normally, the sources will either be soluble salts, such as calcium chloride, sodium or calcium hexafluorosilicate (Na2 or CaSiF6) or sodium fluoride, or may be added as dilute acids in the aqueous lubricant, generally less than about 1 M. Usually at least about 5, more usually at least about 10% of the hydroxyl groups will be replaced, and up to 100%.
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