Aug 2, permanent change in standard pre-furnace clean

J Provine jprovine at
Mon Aug 1 11:15:35 PDT 2011

where should we go to find the data from your tests comparing this new clean
with the cleans that have been in use?
this is a exciting step forward to be more inline with the industrial

On Mon, Aug 1, 2011 at 11:08 AM, Uli Thumser <uthumser at> wrote:

>  Dear wbdiff users:
> We would like you to be aware of upcoming changes in the standard
> pre-furnace clean procedures.
> We've made a reservation tomorrow, August 2nd from 10 AM to 12 PM.
> Instead of the 4:1 sulfuric-peroxide/HCl-SC2/HF dip sequence that has been
> standard at SNF for many years, we are going to use a standard RCA: SC1/SC2/HF
> dip.
> SC1 consists of 5:1:1 H2O/H2O2/NH4OH (Ammonium Hydroxide).
> The SC1 bath must be changed every four hours and the addition of H2O2 is
> allowed, much the same as the SC2 bath, 5:1:1 H2O:H2O2:HCl.  The bath
> temperature is 50C and the time remains 10 minutes.
> Note: today we replaced already two rows of sulfuric acid with Ammonium
> Hydroxide in the right chemical passthrough. Ammonium Hydroxide is no
> longer in the left passthrough.
> SNF staff
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