| http://www.w3.org/ns/prov#value | - The invention also concerns a method of preparing a silicate according to the above description by drying an aqueous solution of an alkali metal silicate to a solid state, suitably a powder, having a water content from about 16 to about 25% by weight, the alkali metal silicate having a molar ratio SiO2 :M2 O from about 1.5 to about 3 in which M is an alkali metal substantially consisting of sodium
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