Hilco Flux Powder #G-29

HILCO Bronze Flux is suitable for use on copper, brass, mild steel and most other common materials.
HILCO Bronze Flux is available in powder only. This powder can be made into a paste by stirring in water until the
mixture has the consistency of thick cream. The flux can be applied by hot prodding i.e. dipping a warm rod into flux
powder and the flux adhering to the rod is transferred to the joint area.
A molten brazing alloy will only wet and flow over a parent metal if both are substantially free of surface oxide.
Simply removing surface oxide before brazing is not effective, since a new oxide layer is rapidly formed on heating.
To achieve a oxide free surface it is necessary to:
• Remove oxide as it is formed using a suitable brazing flux, or
• Prevent oxidation during brazing by heating in a protective atmosphere, or
• Use a self-fluxing brazing alloy (possible when copper-to-copper brazing only!)