Abstract: The present invention is a high integrity storage container which is particularly well adapted for storage of chemical, radio-nucleide, or other types of waste materials. The body portion will typically be of right rectangular configuration having an open top. An inwardly oriented flange is located completely around the upper periphery of the container body where it acts with a corresponding mating surface on a lid to provide sealing surfaces. A key element is a novel folded gasket located between the mating surfaces of the body and lid. This is oriented with the fold portion toward the outer periphery of the container where it has minimum exposure to the contents. Preferably, the lips or edges of the gasket are bonded to the lid and body flange by a pressure sensitive adhesive to form a tight seal. A resilient strip is located within the folded area of the gasket to urge the adhesive coated surfaces into intimate contact with the mating surfaces of the lid and body flange.

Abstract: A folded gasket formed of a length of flexible fabric-like material is disclosed as being disposed between juxtaposed surfaces at the juncture of the lid periphery to a container mouth to adapt the container to withstand the rigors of transport, storage and burial as in the case of the nuclear waste material and the like.