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No-clean flux residue is acceptable on all 3 classes of PCBs as defined by IPC-610 provided it does not inhibit visual inspection, access to test points, or have a wet, tacky or excessive residue that may spread onto other areas. Connector mating surfaces must also be free of flux residue. Fingerprints in no-clean residue are a class 3 defect [19]
There is a wide variety of cleaning agents for these fluxes. A no-clean flux is designed to leave only small amounts of inert flux residues. No-clean pastes save not only cleaning costs, but also capital expenditures and floor space. However, these pastes need a very clean assembly environment and may need an inert reflow environment.
Slag is a liquid mixture of ash, flux, and other impurities. This reduction of slag viscosity with temperature, increasing the flow of slag in smelting, is the origin of the word flux in metallurgy. The flux most commonly used in iron and steel furnaces is limestone, which is charged in the proper proportions with the iron and fuel.
The flux also serves the purpose of cleaning any contamination left on the brazing surfaces. Flux can be applied in any number of forms including flux paste, liquid, powder or pre-made brazing pastes that combine flux with filler metal powder. Flux can also be applied using brazing rods with a coating of flux, or a flux core.
The flux or flow rate in cross-flow filtration systems is given by the equation: [4] = (+) in which: : liquid flux: transmembrane pressure (should also include effects of osmotic pressure for reverse osmosis membranes)
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