Abstract: A method of cladding a separator, that is a diaphragm or membrane, to a cathode box of the pocket type comprising a plurality of foraminate walls, the method comprising positioning a separator in the form of a sleeve in each pocket of the cathode box with the ends of the sleeves projecting beyond the ends of the pockets and heat sealing by means of radio frequency heating those parts of the sleeves projecting beyond the ends of adjacent pockets, either to each other or to additional heat sealable material. Also a cathode box clad with separator, and an electrolytic cell comprising a cathode box clad with separator.

Abstract: A diaphragm or membrane suitable for cladding a cathode box for use in an electrolytic cell and comprising a plurality of foraminate cathodes of the pocket type, the diaphragm or membrane comprising a sleeve portion and a plurality of tabs on both edges of the sleeve portion, and preferably two tabs on both edges of the sleeve portion, the dimensions of the sleeve portion being such that, when the diaphragm is positioned in a pocket of the cathode box, the edges of the sleeve portion and the tabs thereon project beyond the extremities of the pocket so that they may be joined to the tabs and sleeve portions of diaphragms or membranes in adjacent pockets of the cathode box.

Abstract: An electrolytic diaphragm or membrane cell is disclosed in which flexible clamp members are arranged to provide sealing engagement between the diaphragm or membrane and its associated support elements.

Abstract: A method of joining together a sheet or sheets of an organic polymer which is not normally melt-processable, e.g. polytetrafluoroethylene, the method comprising the steps of(a) contacting a strip of melt-processable organic polymer, e.g. fluorinated ethylene/propylene copolymer, with the faces of the sheet or sheets in the region of juxtaposed edges of the sheet or sheets,(b) stitching the strip to the sheet or sheets by means of a thread, and(c) heating the strip in order to fuse the strip and/or the thread to seal the holes created by the stitching step, and, where the strip has not previously been fused to the faces of the sheet or sheets, in order to fuse the strip to the faces of the sheet or sheets.Preferably, the thread is of a melt-processable fluorine-containing polymer and a gauze is placed in contact with and stitched to the faces of the sheets opposite from the faces contacted with the strip of melt-processable organic polymer.