From cm_richter at att.net  Tue Mar 11 14:14:50 2003
From: cm_richter at att.net (cm_richter at att.net)
Date: Tue, 11 Mar 2003 22:14:50 +0000
Subject: KOH decontamination  @ 2:30pm to 5:30pm today (3-11)
Message-ID: <mailman.3.1356283988.5349.wbsilicide@snf.stanford.edu>

I'll be using the HCL Hot pot today for KOH decontamination this afternoon


Claudia


From rcrane at snf.stanford.edu  Tue Mar 25 11:23:24 2003
From: rcrane at snf.stanford.edu (Dick Crane)
Date: Tue, 25 Mar 2003 11:23:24 -0800
Subject: Problem wbnonmetal 2003-03-24 23:37:20: BOE problem
Message-ID: <3E80ACAC.90EBC91A@snf.stanford.edu>

Dan and wb users,

I have seen this before here and at my previous company. I spoke with
the supplier (Ashland Chemical at the time). The chucks are precipitated
NH4F. Most likely, the delivery truck saw some cold weather during
shipping. The chucks are slow to go back into solution. The bottles may
be used as is, but the etch rate will be reduced. We are ordering more
chemicals and monitoring our current supply.

Dan, thanks for pointing this out.

Dick