Charles,

I do not believe there to have been too many changes.

The only materials I am aware of are:

Clay based which clog your filters and

Salt based which kill your cation/anion resins in minutes.

The only route is to direct your pre-wash to drain and re-circulate the wash
and rinse sections.

Unless someone else knows different............

Regards, Graham Naisbitt

[log in to unmask]

Concoat Ltd             Phone: +44 1276 691100
Alasan House          Fax:      +44 1276 691227
Albany Park
CAMBERLEY
GU15 2PL UK

Any opinions expressed are those of this employer.

-----Original Message-----
From: Karalekas, Charles <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 11 September 1998 15:32
Subject: [TN] Water soluble temporary solder mask


>I am seeking information on the feasibility of water soluble temporary
>solder mask in our process.  We are using a closed loop water treatment
>system which, from all the information I have been able to gather, dooms it
>to failure due to the clay and other particulate matter in the masks which
>would clog our mixed bed treatment filters.  Some of the other postings on
>Tech Net regarding this issue are a bit old and I was curious to see if
>there were any recent developments in the industry.  A separate cleaning
>cycle would do the trick but its cost would not be justifiable versus
manual
>removal.
>Charles Karalekas
>Charles Karalekas
>Engineer Specialist
>Advanced Manufacturing Eng.
>& Material Evaluation
>Process Development
>Northrop Grumman
>847-259-9600 X6759
>FAX 847-506-7905
>E-Mail:[log in to unmask]
>
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