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Date: | Thu, 06 Jun 96 08:36:31 CDT |
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We have a good deal of bacteria that like to reproduce in our gold
plating rinses. We have had them for years and they have not caused a
defect yet. We have done some lab studies and consulted with some
microbiologist at the University of Texas to see what we could do to
get rid of them. There are a number of algaecides and antibiotics
that will work but the "bugs" will become resistant over time. You
have to rotate through a treatment reigme to keep their populations in
check. They don't seem to favor the gold baths. We surmise that the
temp and/or cyanide concentration is too high. The
algaecides/antibiotics that we considered were to be used in such low
concentrations that we were not concerned with pass-through
We simply use household bleach at 5% v/v on a maintenance schedules.
Since the bleach attacks their cell walls, they can not become
resistant.
Michael Holan
Radian International, LLC
Elecronics Div.
512/310-4209
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Subject: Algaecides/Biocides
Author: [log in to unmask] at INTERNET
Date: 6/5/96 7:03 PM
Hi everybody!
I am looking for some information about reducing algae and bacterial growth
in process baths. In the last few weeks, I've had several engineers
propose some rather nasty chemicals they wanted to add to either gold
baths, or photodeveloping baths to stop algae from growing. Does anyone
else have this problem? What do you use? Do you have any concerns about
pass-through to your POTW?
I talked to some guys from DuPont at IPC Expo, and they weren't too
concerned about pass-through. However, they were selling photochemistry
also!! (Sorry about that, John Lott. I had to get that in.)
I would appreciate any information, abuse, snide comments, etc.
John Sharp
Merix Corporation
Forest Grove, OR Operations
503-359-9300 (ext. 5-4351)
503-359-1040 FAX
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