Hi Phil,

I agree with the other comments made so far.  Also if the "no-clean"
flux does not see a correct profile (set temperature for at least a
certain time) it can behave differently than if it has been processed
correctly.  

I have also seen more problems with "no-clean" that has been cleaned
than a clean only flux.  This is why products that our customers require
cleaning we have chosen to use water soluble flux.

Regards,

Jerry Dengler
Production Manager
Pergamon Corporation


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Thursday, October 04, 2007 11:55 AM
To: [log in to unmask]
Subject: [TN] operational sweet spot for no-clean flux

Hello Techsperts,

Is there a range in which no-clean is best NOT used?  For example, very
low current circuits or high voltages greater than 110 up to 25 kV?  Our
primary problem seems to be with SMT boards and from more than one
vendor. 

I know a lot of companies use no-clean, but for those who insist on
washing boards even those with no-clean flux, what is the reasoning?
Simply esthetics or an actual circuit related requirement?

I'm trying to determine if all our boards must be washed or if there are
any that would be a don't care. 

Thanks in advance,

Phil

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