FIELD: manufacturing of heat insulating materials. SUBSTANCE: raw materials mixture contains (mass %): lime 4.0-10.0 (as calculated for CaO), silica component 6.0-12.0 (as calculated for SiO2) and filler. Mixture of crystalline wollastonite and amorphous wollastonite at their ratio 50:50 is used as mentioned above filler. Preliminary prepared mixture of crystalline wollastonite and amorphous wollastonite is mixed with lime which is used as milk of lime, with silica component and with water. Thus prepared heat insulating material has reduced shrinkage at temperatures higher 700 C. EFFECT: improves quality of desired product. 1 tbl
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