Richard,
At Nortel I used to do viscosity checking on every lot when it arrived.
I did that for two years and then gave it up as a waste of time.
Obviously the process engineers are doing some checking on the shop
floor, as you describe.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Wednesday, June 24, 2009 10:22 AM
To: [log in to unmask]
Subject: [TN] Solder paste validation at point of use
I would like to know what others do to ensure that the solder paste is
good at the point of use.
I am NOT looking for a solder paste handling procedure, what I am
looking for is what type of test can be performed that is quick, easy,
and does not hold up production. We do paste viscosity testing on each
lot that we receive, and we also strictly monitor our paste printing
process with the post-print inspection machine. We have validated our
entire solder paste handling system to ensure that the paste is handled,
labeled, and properly rotated.
We have had no issues with the solder paste that we use.
Our customer thinks we should test each lot of paste when it is removed
from refrigeration prior to use on production hardware. I am not really
sure what a second viscosity check would do for us, but I am open to
some other testing method that does not consume a lot of paste and would
provide data we can use.
Any suggestions?
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