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November 1998

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Subject:
From:
"<Rudy Sedlak>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 30 Nov 1998 09:52:19 EST
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In a message dated 98-11-25 18:53:46 EST, you write:

<< We beleive this tin oxide is not soluble

True, in water...

and can not be cleaned with any thing,

Not true, but what it may need to be cleaned in  may be unacceptable...

and in order to eliminate this tin oxide residue we must eliminate
 oxygen in the assembly process and use Nitrogen (N2).

Eliminating Oxygen should eliminate the problem...

The residue you are seeing is either an insoluble Stannous Tin compound,
likely an organic Stannous compound, or it is (more likely) Stannic Tin oxide.

Either compound requires an alkaline cleaner to COMPLETELY remove it.  (Some
organic solvents may partially, or largely remove it)   The Stannic Tin oxide
can be removed by either a STRONGLY alkaline cleaner, basically dilute
Caustic, or dilute Hydrofluoric Acid, or Ammonium Bifluoride (which really is
half neutralized Hydrofluoric Acid).

If removal is the path you want to take, rather than prevention, get back to
me directly, and we can discuss specific options.

Rudy Sedlak
RD Chemical Company

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