FIELD: refrigerating machines, freezers and boilers. SUBSTANCE: heat-insulating unit or member has core made from organic foamed insulating material with open cells which is located between outer and inner walls of unit; method of manufacture of heat-insulating device includes foaming of insulating material in chamber formed between inner and outer walls of unit. Vacuum is created in foamed chamber which is repeatedly filled with insulating gaseous composition. EFFECT: enhanced insulating ability during entire service life. 18 cl, 3 tbl
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