Hi all,

Good point there, with the ESD. We have made clever polypropylene baskets
for one application and ended up getting "dinged" for the plastic. Irony of
the whole thing, though, is most (almost all) aqueous cleaners are
constructed of polypropylene!!! Even worse are the neoprene rubber curtains
touching the assy between each stage (however we can provide ESD dissipative
curtains). While employed at Unisys, we ran a static meter through the
cleaner and found that although the material is a high risk, the relative
humidity inside was enough to keep charges at bay. What we *DID* learn is
the blowers in the dry section created a lot of static but simply grounding
the stainless steel air knives seemed to chase that one away as well. The
outside of these cleaners are "hot" and resting an assembly on the polypro
surface tends to be a common practice. Those "dissipative cleaning
solutions" and air ionizers resolved that issue.

Just wanted to throw in my 2 cents!

Ed

Date:    Thu, 18 Jun 1998 14:19:23 -0400
From:    "Gagrani, Kishore" <[log in to unmask]>
Subject: Re: Washing of small PCB

Make sure you take proper care of ESD while doing any customized
solution for washing (specially take care of component's sensitivity
for static charge) . I have had a very bitter experience on this.

Thanks


Ed Popielarski
QTA Machine
10 Mc Laren, Suite D
Irvine, Ca. USA 92618
Ph: (949)581-6601
Fx: (949)581-2448
E-Mail: [log in to unmask]

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