HBr request from John Choi

Mary Tang mtang at snf.stanford.edu
Wed Aug 31 22:54:18 PDT 2005

Hi John --

The waste will be collected locally, as he's etching InP.  The Hbr and
nitric are diluted by 30X and reacted by the time he uses it.  He'll
provide an exact procedure for our reference, but apparently, the mixture
is stable.  If he's collecting localy, it won't be mixed with anything


On Wed, 31 Aug 2005, John Shott wrote:

> Mary:
> This sounds fine to me ... my only remaining question is related to
> disposal:  Will this go down a "normal" acid drain and into the normal
> neutralizer system?  Is there any chance that this could get dumped into
> the HF tank?  Because that often has a higher percentage of nitric ...
> and sits there for up to 90 days, this would seem to be less than
> wonderful.
> Thanks,
> John

More information about the specmat mailing list