FIELD: packing. SUBSTANCE: proposed cap is designed for detachably stopping of polymeric vessels. Cap body is made to suit vessel to be sealed. Stopping mechanism detachably closes vessel by cap body. Seal engages with upper edge of vessel to seal it when stopping mechanism is closed. Cap is provided with wedge-type sealing projection on its body with width B exceeding the thickness of vessel upper edge. Thickness of projection D in place of contact of cap with upper edge is within 0.2 and 0.5 mm. Upper inner surface of seal in place of contact with sealing projection has wave-shaped ribbed structure. EFFECT: improved stopping of vessel. 16 cl, 4 dwg
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