FIELD: chemistry.
SUBSTANCE: invention relates to construction materials as well as to production of artificial heat-insulating materials. The crude mixture for producing heat-insulating materials contains the following in wt %: quarry diatomite 53-67, dry diatomite powder or powdered wastes from abrasive treatment of calcined foamed diatomite articles with moisture of not more than 8% 5-10, chalk 10-12, calcined soda 17-22, oil coke 1-3.
EFFECT: reducing average packed density while preserving compression strength.
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