AQUEOUS COMPOSITION ON THE BASIS OF SILICIC ACID SOL FOR CLOSING OF FIXING MASSES

摘要

Aqueous silica sol stabilised against freezing, containing 25 to 50% by weight of SiO2 and 2 to 10% by weight of urea and/or urea derivatives of the general formula …… in which X and Y can be an NH2 or NHR group, and R denotes an alkyl radical having 1 to 4 carbon atoms, and its use in phosphate-based investments in dental technology.