FIELD: cryogenic devices. SUBSTANCE: heat-insulating casing of Dewar flask having inner and outer walls has inner space between these walls which is fully or partially filled with insulating material. Inner space may be used for placing the moisture accumulating and sorbing materials whose sorbent is chemical desiccant. Casing includes container which is divided into inner zone for sorbent and outer zone for moisture-accumulating material by porous partition. Outer zone is brought in communication with inner space. EFFECT: enhanced efficiency. 8 cl, 5 dwg
