froststabilisiertes kieselsol and its use as a liquid for einbettmassen on phosphatbasis.

摘要

A SiO2 sol, stable against frost, contains 25-50 wt% of SiO2 and 2-10 (5-7) wt% of a cpd of formula (I) X, Y = NH2 or NHR; R = 1-4C alkyl. Pref. the sol. esp. contains 5-7% of urea and 35-45% of SiO2. The additive may also be N-(m)ethylurea of N,N'-dimethylurea.