BOE (6:1) bath has some issues....
npapte at stanford.edu
Sun Dec 9 19:24:39 PST 2012
Last time I even found some liquid on top of the lid on the 6:1 BOE bath,
which I had to wash away. Please be very careful when working with
chemicals, and keep the wetbench clean & safe for the next users.
On Sun, Dec 9, 2012 at 6:37 PM, Benjamin Chui <bwchui at yahoo.com> wrote:
> I second Sangmoo. More often than not, the 6:1 BOE bath has a lot of
> white crystals around it when I come use it. I have to rinse them off the
> counter and even the lid all the time. I think the cause is, some users
> don't realize that the 'water' left on the counter is actually BOE and will
> evaporate to leave solid HF crystals. I hope the uninformed users get this
> message and try to keep the wet bench clean. Even if you've rinsed the
> countertop after use, you'll have to air-gun away the water away; otherwise
> the next person who comes along has no way of knowing if the liquid is
> water or acid.
> *From:* Sangmoo Jeong <popomoo at stanford.edu>
> *To:* wbnonmetal at snf.stanford.edu
> *Sent:* Sunday, December 9, 2012 3:39 PM
> *Subject:* BOE (6:1) bath has some issues....
> Dear wbnonmetal folks
> Some of you might notice that BOE(6:1) bath has some issue.
> Whenever I tried to use the bath in the morning, there were lots of white
> stuff around and over it.
> The white stuff is crystallized powder of HF.
> It happened almost every day for the last two weeks.
> There are two possible reasons.
> 1) The bath, itself, might vomit the acid from the inside to the outside
> at night (when no one is around).
> 2) Some users are a very little bit careless to use the bath and they
> might spill some acid.
> If you see the case like "1)", please report it to the staff asap.
> In addition, please use the bath carefully and rinse the bath after your
> Have a good Sunday.
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