In reply to Yuan's message on Friday, I am baffled.

Why do you want a "No-Clean" flux that you can clean? Do you mean a low or no
solids product instead?

From our experience, trying to clean no-clean is not good news. Finding the
right chemistry to work for you can be a time consuming and difficult project.
I therefore strongly suggest that whatever trials you conduct, make sure they
are as close as possible to production conditions. I.e. run minimum 4 hour
tests with largest possible number of assemblies not just 10 or 12.

Yuan correctly indicates that there will be residues. The issue is not so much
visual appearance but whether any remaining residues could impair circuit
reliability.

So when you do get to your trials, try producing through J-STD-001, and
testing to IPC-TM-650 (and IPC9201) with inspection to IPC-610

I would love to hear from others, their views on this topic.

Graham Naisbitt


Concoat Ltd                                     Email: [log in to unmask]
Alasan House, Albany Park                       Tel:    +44 (0)1276 691100
Camberley, Surrey GU15 2PL UK           Fax:    +44 (0)1276 691227


-----Original Message-----
From:   TechNet Mail Forum  On Behalf Of [log in to unmask]
Sent:   Friday, August 01, 1997 5:31 PM
To:     [log in to unmask]
Subject:        [TECHNET] No-clean flux query

     Hello,

     My company would like to move to No Clean flux for rework of PCBA's.

     The main criteria we are looking for is the following:

     1.  High Quality Solder Joint
     2.  Easy to work with
     3.  Low residue
     4.  Capability to be water washed
     5.  Capability to be not cleaned
     6.  The residue be contained at the location of the solder joint.
     7.  The residue be formulated in such a way that it will not collect
     dust and debris.

     Any information about such fluxes are appreciated.

     Thanks,

     Yuan
     (303)417-5655