Filters of sintered glass for a variety of technological and scientific purposes for which very little resistance to flow is required, are produced from glass fibres =100mm long, with a dia, of 0.1mm, drawn from glass rods. The fibres, of great uniformity are formed into a fleece given cohesion by an organic bonding agent. 75-200 layers of the fleece, to give a thickness of 10mm are laid one on top of the other and subjected to a temp. of 720-780K until all the bonding agent is removed. The pads of filter matl. are then pressed between scale-free, chrome-nickel-steel plates and heated at 920-1000 K until sufficient tenacity is obtd.
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