Abstract: An aqueous acidic disinfecting and sterilizing composition for medical instruments, which may include brass, copper, aluminum, stainless steel, plastic and ceramic components. The composition contains hydrogen peroxide, peracetic acid, a corrosion inhibitor system, a surfactant and a stabilizer. These compositions have in use stability and are effective as a disinfectant and/or sterilant either at room or when heated. For other applications, surfactants, sequestering agents and stabilizers may be optional.

Abstract: To reduce the cost of construction and avoid alignment problems of its component parts, a non-welded construction of mast discharge electrode, as used in an electro-precipitator, comprises a tube having holes passing transversely therethrough, cross members frictionally secured in said holes, and at least two wires extending parallel to said tube and passing through holes in said cross members, the wires being secured in the holes also by friction. The cross members may be knurled so as to be gripped in the tube holes, the latter preferably being formed by means of a punching operation. The cross members may be crimped frictionally to secure the wires. The provision of a non-welded construction particularly at the wires avoids weakening the wires because of the welding, and distortion arising from the heat of welding. The cross members may alternatively be welded to the tube if desired.

Abstract: A gas conduit delivers gas to an electro-precipitator at an angle to the direction of gas flow through the precipitator. Projections are provided in the conduit adjacent the inlet to the precipitator to increase the thickness of the turbulent zone of the gas boundary layer; this urges gas towards upstream regions of the inlet of the precipitator, and thereby enhances even distribution of the gas across the inlet.