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August 1999

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Subject:
From:
Paul Brown <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 19 Aug 1999 23:51:25 +0100
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Aqua Regia is also geat at dissolving gold

----- Original Message -----
From: Rudy Sedlak <[log in to unmask]>
To: <[log in to unmask]>
Sent: 19 August 1999 23:19
Subject: Re: [TN] Etchant for SnPb solder


> Yasmeen:
>
> FUNNY!
>
> We vendors work very hard at creating solder strippers (etchants) that
will
> etch solder (Tin/Lead) and etch the Copper as little as possible.  Now you
> want something that does both!
>
> Actually this is REAL EASY, if a little dangerous.  Use Aqua Regia, or a 3
> part mix of Conc. Hydrochloric Acid, and 1 part Conc. Nitric.  This mix
give
> off ugly fumes, which are not real healthy, but if you only have a few
parts,
> it will go through both Tin/Lead and Copper like a hot knife through
butter!
>
> Alternately, contact any of the Tin stripper chemistry suppliers, and ask
to
> buy their product without the Copper attack inhibitors, you will get what
you
> are looking for.
> If the Tin/Lead is not fused/reflowed, any Tin stripper will strip
Tin/Lead
> as well.
>
> Best,
>
> Rudy Sedlak
> RD Chemical Company
>
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