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December 2002

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Mon, 23 Dec 2002 15:35:00 +0800
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Hi, Mel,

The problem is finding the folks here in Singapore who can do a convincing
job, as very few companies have any experience with Class 3 board
manufacture. I also want to avoid firing our very few boards around the
country to get cleanliness measured in case they meet some unpleasant
adventures along the way. I would prefer to have something here on site to
check the boards straight after cleaning and before coating - something
that would give us reasonable confidence that our boards are as clean as we
would like them to be..

My main problem, though, is that I have to try and buy equipment for a
production run without having any boards to use in the assessment. It's our
first ever production run worthy of the name, and we have no older
equipment we're trying to replace, no past experience to draw on, no-one
but me with any experience in class 3 board manufacture to guide us, and my
experience has not involved cleaning processes at such close quarters
before. There is not the funding available, not the resources, to do a lot
of researching, experimentation and testing - we're expected to go with our
best assessment, and our best assessment had better be right and not cost a
fortune.

Why do you think the Omegameter tests would not be of any value? Cost? Lack
of necessary resolution? Not enough boards to justify having a facility of
our own? What's the problem with water soluble fluxes and the Omegameter? I
think I need to improve what little chemistry knowledge remains to me from
my school days!

Thanks for the advice though, and Merry Christmas, one and all. Me, I'm
doing food on The Day for about 40 people, so guess who will not be getting
much of a well-fed rest in front of the Christmas TV movies?!.

Peter



"Mel Parrish" <[log in to unmask]>      20/12/2002 10:15 PM

              To:  "'TechNet E-Mail Forum.'" <[log in to unmask]>, DUNCAN Peter/Asst Prin Engr/ST
              Aero/ST Group@ST Domain
              cc:
              Subject: RE: [TN] Cleanliness measurement equipment








Hi Peter,
Can't imagine the Omega meter type of tests to be of any value. Especially
when considering the use of Water Soluble fluxes. Why not send them out for
test to someone that can justify the capital investment for serious
cleanliness test resources.

Mel Parrish
Director, Training Materials Resources
Soldering Technology International
102 Tribble Drive
Madison, AL 35758
256 705 5530
256 705 5538 Fax
[log in to unmask]
www.solderingtech.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Thursday, December 19, 2002 10:16 PM
To: [log in to unmask]
Subject: [TN] Cleanliness measurement equipment


Dear All,

What would your recommendations be for equipment to measure board
cleanliness under the following circumstances?:

Number of boards = 10 pcs per month up to a total of 280 boards.
Board size = typically VME - approx 9.5" x 6.5"
Board type = FR4, Class 3, 10 or 12 layer ENIG or HASL finished.
Assembled with 63/37 solder paste and water-soluble flux, reworked using
Kester 63/37 cored solder with compatible w/s flux
Other main residues would come from fingerprint oils and residues from
stripping Humiseal off boards using Conformox or Forane.

I am trying to set up a new capability here and am looking for the least
expensive equipment that will reliably measure genuine cleanliness levels
down to 0.02ug NaCl eq/cm^2. I can only justify equipment expenditure
against this one small contract that involves a total of 280 boards, hence
the need for cost-effective (aka low-cost) choices.  So far, I see that the
Omegameter still features heavily in discussions on this topic - is it
still a good tool to use, or is it's technology too old now to be capable
of measuring accurately the high levels of cleanliness demanded by today's
high-reliability electronics? Other options, like the Zero-Ion, or
Concoat's Contaminometers, good as they seem to be, are several magnitudes
more expensive and harder to justify as a result unless there's a good
reason why less expensive options are not suitable.

I could also use your recommendations on SIR test equipment.

Thanks for any help you can offer.

Peter

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