FIELD: foamed products containing many layers of foamed low-density thermoplastic compositions. SUBSTANCE: method of production of polymer of copolymer foam plastic includes the following stages: (a) preparation of at least, one foaming composition containing, at least, one polymer or copolymer and composition of foaming agent; (b) extrusion of composition through head with many holes; (c) foaming of extruded composition at temperature of foam generation which is higher than glass transition temperature or melting temperature of polymer composition; (d) holding of foamed product at elevated temperature for period of time enough for attaining adhesion between separate layers of foam; (e) leaving of foamed product for cooling. Offered method is distinguished by the fact that foamed product has many sticked together layers of foam, where, at least, one foam layer extends over entire width of foamed product. EFFECT: provided multilayer foam plastics featuring excellent isometric properties with low densities. 13 cl, 5 tbl, 7 ex
