Problem wbnonmetal 2003-03-24 23:37:20: BOE problem

Dick Crane rcrane at snf.stanford.edu
Tue Mar 25 11:23:24 PST 2003


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




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