FIELD: building materials. SUBSTANCE: mastic has, wt.-%: polychloroprene rubber 12-16; plasticizer 0.5-1.5; filler 20-40; magnesium oxide 0.2-1.0; chloroparaffin 0.5-1.5; waste in production of 2,6-di-tert.- butyl-4-methylphenol at rectification stage 0.5-1.5; organic solvent: a mixture of benzine with ethylacetate at mass ratio 1:1 up to 100. EFFECT: enhanced quality of mastic. 3 tbl
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