This is tricky.  Difficult to spray and weigh a board due to solvent
evaporation.

Most reliable method that I've used is to invert the spray head to spray
down, collect the sprayed flux into a graduated cylinder and spray for a
set length of time. You can then calculate the volume of flux sprayed on
you board, based on the time it was sprayed.  With the flux density &
solids content you can more or less calculate the solids sprayed onto
the board.

You can also check the spray pattern by spraying onto a sheet of thermal
paper.

Good luck. 

Rich K / Kimball-GTS

 

-----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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