Printech Archive, April, 1999: Chromate in Screen Emulsion

Chromate in Screen Emulsion

Wayne Pferdehirt (
Thu, 1 Apr 1999 09:56:31 CST

I am forwarding this question to the Printech listserv from the ChemAlliance
listserv. Any ideas we can pass along re. reduction or control of the
chromate? Post responses to Printech and I will forward for posting to

> >From: []
> >Sent: Thursday, April 01, 1999 9:02 AM
> >To: ChemAlliance Regulatory Discussion List
> >Subject: [chemalliance] Chromate
> >
> >
> >I was wondering if anyone might be able to help me out. We have a
> >division of
> >our company that makes screens for another division of our company that
> >does the printing. The division that makes the screens is having a
> >problem with high chromium numbers. This is being caused by washing the
> >emulsions of off the screen so that they can be reused. The
> >chromium(actually chromate) is coming from the emulsion on the screens.
> >Does anyone have any suggestions in eliminating this problem. We know
> >would could precipitate it out with SO2, but we were wondering if there
> >was another way, other rhan chemical treatment. Thank you very much.
> >
> >Mike

Wayne P. Pferdehirt, P.E., AICP
Director, Master of Engineering in Professional Practice Program
Specialist, Solid & Hazardous Waste Education Center
University of Wisconsin-Madison/Extension
610 Langdon Street, Room 532, Madison, WI 53703-1195
Phone: 608/265-2361 Fax: 608/262-6250



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