Homebrew PCBs

Do any
> of you know of an electronics friendly, dry flux powder?  Water soluble
> is even better. I've found a number of flux powders, but they all seem
> to be for brazing.  One that I don't know what it's used for is Ammonium
> Chloride: UnitedNuclear.com says: "Ammonium Chloride is a common
> soldering flux used for joining metals together." Does anyone know if
> NH4Cl is suitable for electronics? If so, I can get 2 oz for $2 there.
> Any ideas on solder powder supplies?
>

Amonnium Chloride is used for soldering copper tubing for plumbing. It is
super corrosive, and will destroy electronics in short order. Check out
Heraeus for powdered flux.

Ron