| http://www.w3.org/ns/prov#value | - As the hardening assistant, there can be mentioned, for example, oxides and hydroxides of various metals such as calcium oxide, magnesium oxide, zinc oxide, aluminum oxide, magnesium hydroxide, calcium hydroxide and aluminum hydroxide, and silicofluorides of various metals such as aluminum silicofluoride, calcium silicofluoride and sodium borofluoride.
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