FIELD: building materials. SUBSTANCE: invention relates to the filed of preparing stable foam dispersed systems that can be used in technology for preparing porous articles based on clay, cement, gypsum. Foaming agent for porosity of articles based on clay, cement, gypsum comprising colophony soap involves water glass as a stabilizing agent and water being water glass is prepared on the basis of microsilica by its direct dissolving in alkaline solutions for a single step under atmosphere pressure, at temperature up to 100 C for 40-120 min and components are taken in the following ratio, wt.%: colophony soap, 1.5-3.0; indicated water glass, 70.0-80.0; water, 17.0-28.5. Invention provides increase of multiplicity and stability of foam, prolonged time storage of foaming agent. EFFECT: improved properties of foaming agent. 2 tbl, 1 ex
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