There are new masks from Tech Spray and Dymax Corp (the latter UV
curable) which both purport to be 100% water soluble.

Peter
--
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Peter Swanson            [log in to unmask]
INTERTRONICS                http://www.intertronics.co.uk

INTERTRONICS is dedicated to providing quality material,
  consumable and equipment solutions to the electronics
manufacturing and other technology based industries, with
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                         service.


-----Original Message-----
From: Douglas Pauls [mailto:[log in to unmask]]
Sent: 12 January 2001 13:58
To: [log in to unmask]
Subject: Re: [TN] RF Surface mount...


Steve,

In addition to everything else that has been said, and forgive me if
this
has been, ..... but if you can do an aqueous clean after reflow how
about
dispensing a water soluble mask  .... then just wash it off afterwards!

*As the cleaning experts all run from the room screaming
incoherently......
I have yet to see a water soluble mask that is *fully* water soluble.
You
*assume* that it all goes off the board and down the drain.  In reality,
it
deposits itself on other places on your board, lines the walls of your
cleaner, coats the pipes of your plumbing, etc.  Since cleaners often
don't
get the maintenance they need, you have your wash section simply become
a
mechanism for applying low levels of dissolved mask on your boards.  As
you
might guess, I am not a fan of water soluble masks.  I'm not a fan of
latex
peelable masks either.  Too much crud left on the board after you peel
them
off.

Doug Pauls,
Rockwell Collins

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