HI Jana,

I can't answer the chemistry question, but regarding
your question to Hans ----- I thought he made a
spelling error when he spelled spud!??

thanx

Bill
--- Jana Carraway <[log in to unmask]> wrote:
> Can someone explain the reactions of the
> discoloration for polyimide and
> soldermask?  These materials would continue to cure
> with exposure to
> extended heat cycles, what is the mechanism of the
> discoloration?  The
> materials continue to cross-link, which in the case
> of soldermask leads to
> brittle mask, but what other reactions are taking
> place and why the color
> change?
>
> This just seems like a good day for a chemistry
> lesson!
>
> Thanks,
> Jana Carraway
> MSEI
>
> PS - Hans Hinner, how does getting married make your
> a spud?  I come from
> Idaho, the potato state, and hence am a
> "spud"...regardless of marital
> state!
>
>
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