Abstract: A metallic layer is removed from a coated glass surface (3) by subjecting the coated glass to the abrasive action of a stripping wheel (7) comprising a particulate abrasive in a porous matrix of polyvinyl formal.

Abstract: Hot glass is thermally toughened by generating a stream of closely-packed, aerated particles, and projecting that stream towards the glass. A plurality of such streams are projected from an array of nozzles, and the velocity of projection of each stream is sufficient to ensure that the integrity of the stream is preserved in its trajectory towards the glass.

Abstract: The invention provides apparatus and a method for thermally toughening glass by quenching the glass with a particulate material. A body of mobile aerated particulate material is created and gas extraction means and gas supply means are located in a region of the body through which a flow of the particulate material towards the glass is to be engendered. Regulation of the gas supply and extraction means regulates the mobility of the particulate material and permits the flow to be switched on and off.

Abstract: A method and apparatus for thermally toughening glass in which a hot glass article is quenched in a gas-fluidized bed of particulate material. A plurality of streams of particles are generated and are projected into the fluidized bed towards the glass immersed in the bed in order to enhance the heat transfer away from the surfaces of the article in the toughening process.

Abstract: A mixer for mixing glass fibres into a relatively dilute aqueous cement slurry, e.g. for use in forming glass fibre reinforced cement products on an asbestos-cement making machine of the Hatschek or Bell type, comprises an annular chamber with a tangential slurry inlet, a helical rising floor, a coaxial conical outlet disposed to receive slurry flowing over the inner wall, which is lower than the outer wall, and a fibre inlet above the conical outlet so that the fibres are mixed with the slurry as it passes down the wall of the conical outlet in a vortex motion.

Abstract: A surface of a hot ribbon of glass, which has just been formed, is coated by directing a flow of coating gas substantially parallel to the glass surface under laminar flow conditions. The laminar flow is in the direction of ribbon advance or co-current to that direction, and the gas is released uniformly across the width of the ribbon. The coating gas contains a constituent, for example a silane, which decomposes on the hot glass surface to deposit a coating, for example silicon, on the glass surface.

Abstract: A low emissivity coating on a transparent substrate of glass or plastics material is produced by cathode sputtering a layer of silver and thereafter reactively sputtering an anti-reflection metal oxide layer over the silver in the presence of oxygen or an oxidizing gas, wherein a small amount of an additional metal other than silver is sputtered onto the silver before the overlying anti-reflection metal oxide layer is applied.The process produces a new low emissivity coated product comprising a glass or plastics substrate with a low emissivity coating comprising a silver layer, a small amount of additional metal dispersed non-uniformly in the silver layer and possibly extending over the silver layer, and an overlying anti-reflection metal oxide coating.

Abstract: The invention relates to calciumaluminosilicate glasses. The glasses contain, in weight percent, 25 to 35% silica, 27 to 35% calcium oxide, 25 to 40% alumina, 0 to 4% of alkali metal oxide selected from lithium oxide, sodium oxide and potassium oxide, and 0 to 5% of titanium oxide and a total content of lithium, sodium, potassium and titanium oxides of 0.5 to 9%. The glasses, in finely divided form, react with aqueous polycarboxylic acids and set to a solid mass; cements made from the glass and polycarboxylic acids are useful in splinting compositions.