FIELD: manufacture of building materials. SUBSTANCE: pressure composition contains filler in the form of ground wood and/or vegetable particles and synthetic resin, in particular diphenylolpropane resin, which is diphenylolpropane-formaldehyde condensation product prepared in presence of sodium hydroxide, borax, and ammonium polyphosphate and modified with magnesium phosphate or alumino-boron- phosphate concentrate, or alumino-chromo-phosphate binder, all in specified proportions. EFFECT: improved waterproofness, tensile strength, and eliminated formaldehyde in produce. 2 tbl, 5 ex
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