Hi Graham - Sir Doug is at the Rockwell Collins Richardson TX facility for 
a couple days but he typically checks his email in the evening so you will 
see a reply later tonight. Apparently the daily high temperature of 0F 
(excluding wind chill) scared him South where the Diet Mt. Dew won't 
freeze. My recommendation is to use Ion Chromatography to demonstrate that 
the components are "dirty". As Bev described, IC is soooo much better in 
terms of definitive results.

Dave Hillman
Rockwell Collins
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Graham Collins <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
02/19/2008 11:35 AM
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[TN] cleanliness testing






Hello TechNet
I'm in a debate with a supplier about the incoming cleanliness of one of 
their parts, they claim it's squeaky clean and I claim it's as salty as a 
bag of salt & vinegar potato chips.  Obviously we are both exaggerating, 
but one of us has a good claim.

They are fending me off with resistivity measurements made per the manual 
test method IPC-TM-650 2.3.25  - which works in that I don't know how to 
convert it to the "ug NaCl/in2" equivalent units I'm used to.  Is there a 
valid conversion? 

Sir Doug of Dew, if you reply please do NOT say it depends...

regards,
 
Graham Collins
Halifax Production Engineering
L-3 communications Electronic Systems
(902) 873-2000 ext. 6215



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