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Since the residues of fluxes are hygroscopic and can cause corrosion they have to be removed completely after the brazing process in very hot or boiling water. Depending on the type and process used, fluxes are being applied in liquid form or as powders or pastes.
{| class="simpletable" style="text-align: left; width: 100%; border:1px solid #000000;
|+ 4.2 Fluxes for the Brazing of Heavy Metals
|Designation
|Designation US (similar)
|Active temperature range [°C]
|550 - 800
|Boron compounds, Fluorides
|All metals and alloys except light metals, alloyed steels, carbide steel
|-
|TYP FH 11
|Copper,
Aluminum bronze
|-
|TYP FH 12
|FB 3-C