FIELD: production of construction materials, process of manufacturing heat-insulating blocks from foamed polyethylene wastes. SUBSTANCE: method involves filling lower and upper layers of mold with ground wastes of unfoamed polyethylene and filling intermediate layer of mold with ground wastes of respective foamed plastic, with volume ratio of layer-by-layer filling of mold being within the range of 20:60:20 to 30:40:30; exposing blocks to thermal treatment at 210-230 C for 10-30 min. EFFECT: high quality of blocks. 2 tbl
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