| http://www.w3.org/ns/prov#value | - on, builder compositions comprise an aqueous solution containing approximately 10% to 60%, preferably approximately 35% to 50% by weight solids content of an alkali metal, especially sodium or potassium,silicate.The concentrated alkali metal silicate solution employed in the builder is preferably obtained by hydrosolubilization of "soluble glasses" in an autoclave under pressure at 140.degree.
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