Don, please tell us more. Several years ago, (at a former company) I was
involved in the switch to no-clean flux. We wanted our board vendors to
guarantee an incoming cleanliness level and met with varying successes.
Some flat out disagreed and argued that they could not, others complied,
and others supplied data that varied. Sometimes, they would send a cert.
with the cleanliness and when we would check, it would not match. They all
wanted to know what cleanliness level was acceptable. We set a
specification number, and asked them to meet them. Unfortunately, since we
used the boards so fast (10K+ per day), if we had a shipment that fell
outside the cleanliness level, we often were forced to used the boards or
else we would shut our automotive customers down due to lack of boards.
We did a lot of testing to determine minimal cleanliness levels, but this
level would vary based on application, and we were not about to set a level
for each board, etc.
So, just curious, what level have you set for incoming inspection, and how
well are your suppliers meeting and working with this spec. I am hoping
that much has changed in this area in the past few years, and when I am
forced to resolve this problem in the future it will be much easier.
Ed Holton
Manufacturing Engineer and Group Leader
Hella Electronics
Telephone (734) 414-0944
Fax (734) 414-0941
"Steffen, Don
E" To: [log in to unmask]
<dsteffen@VDO cc:
.COM> Subject: Re: [TN] process control of
Sent by: final cleanliness in a no-clean world
TechNet
<[log in to unmask]
ORG>
03/23/00
06:21 AM
Please
respond to
"TechNet
E-Mail
Forum.";
Please
respond to
"Steffen, Don
E"
Wade
I am a Senior Quality Engineer at VDO Control Systems in Auburn, IN. We
started into the process of switching over to a No Clean Process. We have
enforced the SIR testing to be done by our suppliers. We use the Omega
Meter
as a measurable for the incoming bare boards and also to measure the
assemblies again prior to any coatings or pottings.
I hope this has helped you
Donn Steffen
(219)925-8887
dsteffen@vdo-com
-----Original Message-----
From: Oberle, Wade [mailto:[log in to unmask]]
Sent: Wednesday, March 22, 2000 4:13 PM
To: [log in to unmask]
Subject: [TN] process control of final cleanliness in a no-clean world
Dear technetters,
How do all of you in the no-clean world monitor and control board
cleanliness. In the days of OA flux, we used an Ionograph or Omegameter to
monitor our 'cleaning' process. Do some of you still use an ionic
contamination tester or do you use SIR testing or nothing or what?
Thanks in advance for your advice.
Wade Oberle
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