FIELD: manufacture of building materials. SUBSTANCE: formulation contains (in wt %): urea-formaldehyde resin, 20-35; phosphoric acid, 2.0-3.0; surfactant (blowing agent), 0.4-0.5; carbonation modifier with 60- 85% humin acids, 0.4-0.6; water, the balance. Aqueous solution of resin, surfactant, and carbonation modifier is foamed with compressed air, then phosphoric acid is added to form low toxic foam plastic. EFFECT: reduced toxicity of product. 1 tbl, 3 ex
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