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Flux. Unless Brazing operations are contained within an inert or reducing atmosphere environment (i.e. a vacuum furnace), a flux such as borax is required to prevent oxides from forming while the metal is heated. The flux also serves the purpose of cleaning any contamination left on the brazing surfaces.
Soldering fluid No.3 for clean, positive joint preparation. For tinned materials and copper. Water soluble. High...
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Powder fluxes for has welding and brazing alumnium and its alloys. EN 1045 - FL10
Powder flux for general brazing work.EN 1045 - FH10
Powder flux for brazing and welding copper alloys. EN 1045 - FH11