FIELD: products suitable for isolation, flotation and packing materials. SUBSTANCE: method comprises mixing cross-linked thermoplastic material with cross-linked agent to form melt, injecting foaming agent into melt extruding the mixture under pressure, varying mixture temperature to attain desired foaming ability and subsequently foaming the mixture in zone with lower pressure to obtain foamed extrudate. The resulting product has homogeneous fine cellular structure consisting substantially from thin-walled cells. EFFECT: m are efficient preparation method. 48 cl, 5 dwg, 9 ex
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