SvenNYC—as far as I can tell, the usual “45%” silver-brazing materials are not at all corrosive after installation. [Athough the flux paste can sting a little if wet and gets in cuts on the hand.] A fluoride-based flux is used for installation, but the residue seems to be quite inert.
An alternative is “15%” sil/phos brazing rod—needing no additional flux for copper-to-copper joints, but requires somewhat more heat in joint makeup. It has a higher melting point compared to the 45% material, but a very wide glass temperature for void filling. The after-sweat flux remains are very small, and although I have not used it to salt my fries, I’ve never found it to be the least concern, much less significantly visible after joint sweating.
[This message has been edited by Bjarney (edited 08-22-2002).]
