Abstract: The present invention relates to the use of at least one oxidant, selected from peracids, in compositions for the processing of semiconductor wafers, in particular for the cleaning and chemical mechanical polishing of semiconductor wafers. The present invention also relates to the use of a composition and composition therefore. The use of the oxidants of the invention leads to a good efficacy while limiting/avoiding the corrosion of the substrate.

Abstract: A flux based on alkali fluoroaluminate is described which is highly suitable for dry application (“dry fluxing”). This is a flux which is free of fine-grained fraction, which is defined by a range of grain-size distribution.

Abstract: A method for separating gaseous mixtures from underground cables or gas-insulated circuits in which the gaseous mixtures, which contain partially fluorinated and/or perfluorinated hydrocarbons and inert gases, are brought into contact with hydrophobic zeolites in at least one adsorption step so that the fluorinated hydrocarbons are adsorbed.

Abstract: Sulfuryl fluoride and ovicidal gases have been found to exert a synergistic action on insect eggs, so it is possible to fumigate under sublethal conditions relative to the ovicide, and the dose of ovicidal gas can be reduced e.g. to sublethal concentrations.

Abstract: A flux based on alkali fluoroaluminate is described which is highly suitable for dry application (“dry fluxing”). This is a flux which is free of fine-grained fraction, which is defined by a range of grain-size distribution.

Abstract: A method of effectively purifying sulfuryl fluoride, which is useful as an insulating gas in electrical devices or as a pesticide and which frequently is contaminated with sulfur dioxide, hydrogen fluoride and/or hydrogen chloride. In the method, contaminated sulfuryl fluoride is contacted with or conducted over an alkali fluoride, e.g. potassium fluoride. The purification can be carried out during sulfuryl fluoride production, during storage of sulfuryl fluoride and/or before or during use of the sulfuryl fluoride, for example, as a pesticide.

Abstract: A flux based on alkali fluoroaluminate is described which is highly suitable for dry application (“dry fluxing”). This is a flux which is free of fine-grained fraction, which is defined by a range of grain-size distribution.

Abstract: Gas mixtures of SF6 and N2 which have been used as an insulating filler gas for underground cables can be separated by use of a membrane separation in order to recover the SF6.

Abstract: Homogeneous compressed gas mixtures of perfluorinated and/or partially fluorinated hydrocarbons and a gas of lesser density are produced using an optionally mobile mixing station including at least the following components: a gas pre-mixing stage in which separately provided gases are brought together; a static mixer and/or buffer tank connected to the pre-mixing stage; and a compressor connected to the static mixer or buffer tank. If a buffer tank is used, a return line may be provided from the compressor outlet to the buffer tank. Mixtures of perfluorinated and/or partially fluorinated hydrocarbons and/or ethers and inert gases such as noble gases, CO2 or N2 and/or SF6, are obtained which are suitable as insulating gases for current-carrying underground cables or gas-insulated switches. High flow rates can be processed using the method, and mass flow meters ensure accuracy and reliability.

Abstract: A method for the recovery or separation of sulfur oxyfluorides from gas mixtures, in which the gas mixture passes through at least one adsorption stage or membrane stage containing or consisting of zeolites with a modulus >10. The sulfur oxyfluorides fixed to the adsorbent may be made available for use after desorption. The sulfur oxyfluorides enriched through the membrane can be re-used directly.

Abstract: Sulfuryl fluoride and ovicidal gases have been found to exert a synergistic action on insect eggs, so it is possible to fumigate under sublethal conditions relative to the ovicide, and the dose of ovicidal gas can be reduced e.g. to sublethal concentrations.

Abstract: An apparatus for determining the physical and/or chemical parameters of an aerosol formulation from a metered dose inhaler, including a housing (1) with a measuring chamber (8) therein, a multiple sampling head (3) having at least one valve, an opening for receiving the measuring electrode (2), and a mechanism for opening a metered dose inhaler cartridge (5) which includes a sleeve (4), connected detachably or non-detachably to the housing (1), for receiving the metered dose inhaler cartridge, a pin or a needle (7) attached to the surface facing the measuring chamber (8) and protruding into the sleeve (4) for opening the cartridge (5), an actuating element (6) for pressing the cartridge (5) against the pin or needle (7), seals for preventing undesired pressure equalization, and at least one connecting opening (7, 10) to the measuring chamber (8) through which the aerosol formulation can pass unchanged into the measuring chamber.

Abstract: A process for laser brazing of aluminum alloys, in which joints are coated with an agent which absorbs laser energy. Fluxes suitable for brazing aluminum, in particular potassium fluoroaluminate-containing fluxes, flux pastes or flux/metal powder mixtures, are used as the agents which absorb laser energy.

Abstract: A flux based on alkali fluoroaluminate is described which is highly suitable for dry application (“dry fluxing”). This is a flux which is free of fine-grained fraction, which is defined by a range of grain-size distribution.

Abstract: A method for the recovery or separation of sulfur oxyfluorides from gas mixtures, in which the gas mixture passes through at least one adsorption stage or membrane stage containing or consisting of zeolites with a modulus >10. The sulfur oxyfluorides fixed to the adsorbent may be made available for use after desorption. The sulfur oxyfluorides enriched through the membrane can be re-used directly.

Abstract: Gas mixtures of SF6 and N2, which have been used, for example, as an insulating filler gas for underground cables, for insulating-gas window panes or as a filler gas for car tires and SF6/air mixtures which have been used as a protective gas when casting magnesium can be separated if they are contacted with hydrophobic zeolites of a certain pore size as selective adsorption agent for sulfur hexafluoride. For a relatively high SF6 concentration, the mixture is preferably first subjected to a membrane separation process and the permeate is contacted with the adsorption agent. The invention also relates to an apparatus for carrying out the process. The process may also be used for separating SF6 from exhaust gases.

Abstract: Gas mixtures of SF6 and N2 which have been used as an insulating filler gas for underground cables can be separated by use of a membrane separation in order to recover the SF6.

Abstract: The production of a potassium fluoroaluminate having a low melting point, which can be used as a flux when soldering aluminum. The potassium fluoroaluminate is prepared in an aqueous medium from aluminum hydroxide, hydrogen fluoride and potassium hydroxide in a molar ratio of aluminum:fluorine:potassium of approximately 1:5:2. After drying at 80° C. under vacuum, the resulting potassium fluoroaluminate has a differential scanning calorimetry melting point of about 548° C.

Abstract: A flux which contains irreversibly dehydrated K2AlF5, for soldering light metal materials, in particular aluminum. The flux has the advantages of forming a very uniform flux coating on the workpiece or workpieces to be soldered and exhibiting outstanding flow of the solder. An appropriate soldering process, an aqueous flux suspension and preparation processes for the flux are also disclosed.

Abstract: A flux which contains irreversibly dehydrated K2AlF5, for soldering light metal materials, in particular aluminum. The flux has the advantages of forming a very uniform flux coating on the workpiece or workpieces to be soldered and exhibiting outstanding flow of the solder. An appropriate soldering process, an aqueous flux suspension and preparation processes for the flux are also disclosed.