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The article considers the results of the study of the uneven distribution of the strength properties of a rigid high-temperature fibrous heat-protective material over the volume of the block. The article presents a comparative study of the uneven strength of two materials that differ in the method of introducing the binder. A conclusion is proposed about the mechanism of the occurrence of unevenness of the strength properties of a rigid fibrous thermal insulation material when a soluble binder is introduced into the material by the strait method. The absence of such a mechanism is shown for materials obtained using a solid-phase binder introduced into the molding hydraulic mass.

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The assessment of waste generated during the production of high-temperature fiber insulation. A method of waste processing with a minimum number of technological stages is presented. The structure and mechanical characteristics of the obtained material are estimated. Full-scale tests of the material under the influence of high-enthalpy flame flow of propane-oxygen burner were carried out. The resulting material is suitable for the production of furnace linings, heat-resistant substrates and containers, flame screens.