FIELD: wood working industry. SUBSTANCE: invention describes press-composition used for production of difficultly combustible tile materials that has wood fiber as filling agent, wood chip or milled particles of annual plants waste, synthetic resin, ammonium polyphosphates and paraffin and additionally it has magnesium phosphate at the following ratio of components, wt. -%: ammonium polyphosphates 5.0-28.0; magnesium phosphate 2.5-13.5; synthetic resin 8.0-14.0; paraffin 0.5-1.5 and filling agent - the rest. EFFECT: enhanced tensile strength and waterproof of tile materials. 3 cl, 2 tbl
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