FIELD: construction.
SUBSTANCE: raw material mixture for producing insulation boards from shredded pine needles subjected to hot pulping and containing the extracted lignin, comprises the additives of liquid glass and slaked lime at the following ratio by weight: shredded pine needles subjected to pulping contains extracted lignin 92-97%, liquid glass 2-7%, slaked lime 1-6 %.
EFFECT: improving the ecological safety and the fire resistance.
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