The only thing I can add to the sound advice you have received thus far is:

1) You must also consider what your product requirements are, perhaps
related to the Class of product you are building.  Class 3 will certainly
have more stringent cleaning requirements than Class 1.

2) Expanding a bit on "In addition to matching the cleaning solution to the
soils to be cleaned" - note that you should also consider all process
residues, not just the flux and solder.  Water only systems are not very
effective at removing non water soluble contaminants, like fingerprints for
example.

Kevin Glidden
Manufacturing Engineer
Luminescent Systems Inc.


-----Original Message-----
From: Douglas O. Pauls [mailto:[log in to unmask]] 
Sent: Wednesday, August 20, 2008 12:12 PM
To: [log in to unmask]
Subject: Re: [TN] PWA cleaning methods

Darn, Richard beat me to it.  In addition to matching the cleaning 
solution to the soils to be cleaned, you also need to consider the kind of 
cleaning equipment.  The dynamics of the machine can make as much of a 
difference as the cleaning chemistry. 

You should probably come to the IPC/SMTA Cleaning Symposium in Chicago in 
October.  Become an expert in the topic in two days.

Doug Pauls




"Stadem, Richard D." <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
08/20/2008 11:02 AM
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Re: [TN] PWA cleaning methods






The cleaning method is tailored to the flux type of the solder paste and
wire solder and wave solder you are using. If you are looking for the
safest method of cleaning, then I would go with deionized water at
145-150 deg. F. and a good water soluble flux process. It depends..... 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of William D. Mengers
Sent: Wednesday, August 20, 2008 10:13 AM
To: [log in to unmask]
Subject: [TN] PWA cleaning methods

Can anyone tell me what the latest and greatest "safe-to-the-hardware"
PWA cleaning methods and solvents there are these days.  One of my
co-workers has been tasked with buying a new cleaning system for PWA's.
Any information will be appreciated.

Thank you,
Bill

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