Howard,

You might want to try 99% IPA again.  At 70% IPA, you have about 30% water
in the alcohol.  The lower concenetration is cheaper but will react
differently with some materials.
Don Vischulis
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Howard Watson
Sent: Wednesday, July 24, 2002 4:49 PM
To: [log in to unmask]
Subject: [TN] Underside stencil cleaning



Hello Technetters,

I am curious if anyone has any information on the correct solvent to use in
understencil cleaners.  We have a DEK Infinity and have been using IPA 70%
concentration since I have been here, and recently I was informed that it
was starting to smear the solder paste (no-clean) rather than cleaning it.
In the past, we had some 99% Anhydrous IPA and the operators loved it for
cleaning stencils (before our ultrasonic cleaner).  I spoke with DEK, and
they don't really have a recommendation.  I don't know if we just got some
weak alcohol or if there is another reason.  Is anyone using the higher
concentration IPA?  Aside from the higher cost, would there be any
disadvantage?

I was told that DEK is coming out with their own cleaning solvent, though I
don't know what it is (Naphtha based?).  As usual, any information is
greatly appreciated.

Howard Watson
Manufacturing Engineer
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