(DE3508783-C)      A totally enclosed lead accumulator uses separators consisting of two coherent composite paper layers. The first is composed of glass fibres with an average fibre dia. of 0.1-2 microns and the second which has the same or a greater thickness has qlass fibres of 3-10 microns average dia. Both the positive and the negative electrodes are in contact on both their surfaces with the first layer so that the second layers abut each other in a cell.    Separator (1) is made on a paper machine and consists of a first acid-proof glass fibre layer (1a) with an average dia. of 0.1-2 microns and a density of 0.2 g/cu.cm, 0.2-0.5 mm thick. The second acid-proof glass fibre layer has an average fibre dia. of 3-10 micron, mixed with 5wt.% of acrylic fibres, and is at least as thick as the first layer. The second layer can have 10-30% of acid-proof synthetic monofilaments of 1.5-3 denier or 30wt.% of glass fibres of 12-30 micron dia. The total thickness of the separator is 0.5-3 mm.    ADVANTAGE -   Such separators have good absorption and standing properties over long periods and are not reduced in thickness by the impregnation with the electrolyte.    (US5075184-A)      The sealed Pb battery comprises cell units composed of (a) a cathode plate, (b) an anode plate, and (c) at least one integrated composite separator sheet interposed between the electrode plates comprising (i) a pressed layer of glass fibres 0.1-2 microns in dia. and (ii) a pressed layer of 99-90 wt.% of glass fibres of dia. 3-10 microns and 1-10 wt.% of acid resistant fibrillation synthetic fibres. The 2nd fibre layer is at least the thickness of the 1st fibre layer. The 1st fibre layer directly contacts the surfaces of both electrode plates, by compressing the cell unit between the walls of the battery container. The 2nd fibre layer is not in direct contact with any electrode plate.    ADVANTAGE -   Good close contact between separator and electrode plates, which is maintained for a long time. Improved battery performance and service life. (9pp)