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June 2006

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Subject:
Re: Boron & Arsenic
From:
R Sedlak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, R Sedlak <[log in to unmask]>
Date:
Mon, 26 Jun 2006 12:34:47 -0700
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Richard:   I cannot comment on the Arsenic, but it is not out of the question that the flux MIGHT have either fluoboric acid, or a salt of fluoboric acid.

Rudy Sedlak
RD Chemical Company

Richard Kraszewski <[log in to unmask]> wrote: Can anyone suggest where in an assembly process I am likely to find
Boron and Arsenic?

I've been presented with an assembly that has some "black crud" on and
around some reflowed SM solder joints.  Analysis came back with not only
the "usual suspects" but also these 2 elements.  While I am not
eliminating it, for various other reasons I am discounting the
likelihood of the solder paste being the source.

Thanks in advance for your thoughts.

Rich K


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