I hope you are referring to your plumbing, as the only Zn containing solder flux I can
recall is the venerable Baker's fluid, there is a similar US product which came in a
yellow tin but I can't recall its name. These things are close to the proverbial wood
soldering flux and definitely not electronic grade. Are also known generically as killed
spirits: essentially hydrochloric acid with the edge taken off with a little Zinc dumped
in.
If you have used Bakers anywhere except plumbing like applications don't ever fly in them
or plan on using them for anything at all after a couple of months.

Assuming you are just making use of us Netters for a week end project......

Un washed or if left too long before cleaning they will blacken solder and green copper.
Should wash off immediately for plumbing purposes with plain water plus maybe a little
soap for wetting. If you have inadvertantly left it a while then you can try an intitial
cold water wash followed by dilute acid to complex off any metal salts, followed by cold
water then as many neutralising and hot water rinses as you need to reach your required
standard. Do not use water over around 40C initially as this will immediately dull your
surface give more problems later.
Surfaces on which this stuff has sat for periods will most likely be dulled or even etched
anyway.

Good luck

Mike Fenner
Bonding Services & Products
T: +44 1295 722992
F: +44 1295 720937


----- Original Message -----
From: Frank Freitas <[log in to unmask]>
To: <[log in to unmask]>
Sent: 19 November 1999 03:43
Subject: [TN] Zinc based flux


> Hi All,
> I am wondering if any of you are familiar with a zinc based flux and if so,
> methods to remove it from copper?
>
> Many Thanks,
> Frank Freitas
>
> -----------------------------------------------
>

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