I haven't heard of anyone measuring flux volume. Don't know what that
would tell you- probably what is more important is areas that are fluxed
but not exposed to the wave solder temperatures. Might ask the flux
vendor about the effects of these residues . The non thermally activated
flux residues on the board might be hygroscopic and cause current
leakage and worse case lead dendrites and/or corrosion.

Tom  


 
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joel Alexander
Sent: Friday, November 30, 2007 4:25 PM
To: [log in to unmask]
Subject: [TN] Wave solder flux volume measurements

Hi guys its me again,


We have a customer that builds power systems for the Telcom companies. 
They recently had a field failure on a backplane. It had sever
corrosion. 
We process the assembly  with a VOC no-clean solder and have never had
issues in the past. The customer indicated that the backplane was in a
damp/moist environment. That is not a good combination for no clean
flux. 
I suggested cleaning but they insisted that we monitor our flux volume
to ensure it is at the recommended application volume. I did not really
agree from a reliability standard. 

Does anyone out there measure their no clean flux volume on a regular
basis?



Joel Alexander
Quality Assurance Manager
TT APSCO, INC. 

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