| http://www.w3.org/ns/prov#value | - amorphous or crystalline alkali metal silicates of formula xSiO2.M2O.yH2O, with 1???x???3.5 and 0???y/(x+1+y)???0.5, where M is an alkali metal and very particularly sodium, including lamellar alkali metal silicates, such as those described in U.S. Pat. No. 4,664,839; alkaline carbonates (bicarbonates, sesquicarbonates); cogranules of hydrated alkali metal silicates and of alkali metal carbonates
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