FIELD: production of building materials, preferably, heat insulation fire-resistant and acid proof materials. SUBSTANCE: mixture comprises, mas. %: microsilica, 67-77; sodium hydroxide, 23-33. Compressive strength is 1.1-3.49 MPa, bending strength is 0.8-1.7 MPa, water resistance (after sustaining within 24 h in water) is 1.8-2.0 %, heat conductivity is 0.075-0.92 %, maximal operation temperature is 1800 C. EFFECT: improved quality of desired product. 4 tbl
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