FIELD: control of foam formation, production of antifrothing agent. SUBSTANCE: mixture of polymethylsiloxane having viscosity 10-100000 sSt (at 20 C) interacts with aerosil and organopolysilicate, the process is carried out in the presence of catalyst, its quantity being 0.001-1.0 weight parts per 100 weight parts of polyorganosiloxane. Monobasic organic acid is used as mentioned above catalyst. EFFECT: improved efficiency of the method.
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