[Fwd: Problem wbnonmetal 2003-03-24 23:37:20: BOE problem]
rcrane at snf.stanford.edu
Tue Mar 25 11:32:54 PST 2003
Dick Crane wrote:
> 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.
More information about the wbdiff