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June 2000

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Subject:
From:
"Collins, Graham" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 19 Jun 2000 10:37:02 -0300
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Hi Ya, Steve!
I hear you, man do I hear you.  Have asked our military customers the same
question.  The short version is that it's always been used, and change is
bad.  Not a great answer but as they say, the customer is always right.  And
from a military perspective I can understand reluctance to change, when your
butt is on the line you want your hardware behaving in a predictable manner
- for the same reasons you will still find 8088 processors going into space
applications.

The other reason I've heard is compatability issues.  If something is going
to be field repaired, or repaired by someone other than yourself, 10 years
from now - who is going to remember what flux was originally used on it if
there are lots of possibilities.  I know, if it's clean, who cares?  But
there is perfectly clean and there is acceptably clean.  My customers
_might_ go for an OA flux if properly qualified, but a no-clean would take
an act of god, and understandably so.  If a field repair is done with RMA,
what's that going to do when mixed with no-clean residues on the board?  I
sure as heck don't know.

Not saying it's right, but one can only argue with the customer so much.
And heck, at least it means the wave soldering room smells like oranges
(from the cleaning solution).

Graham Collins
Process Engineer
Litton Systems Canada (902) 873-2000 ext 6215

-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Friday, June 16, 2000 4:34 PM
To: [log in to unmask]
Subject: [TN] Generic question about Flux types...


Hi ya'll!!

I gotta generic question about flux types. We do quite a few boards here
that
still call out that the assembly is to be built to MIL-STD-2000 specs, and
as
has always been here, RMA flux is always used. My question is, what is the
REAL reason to use an RMA?

I've been under the impression that because a RMA is not as active as an OA,
any residues that might be left behind from the RMA wouldn't be as harmfull
as OA residues would be. But if you always ensure that you clean your boards
thoroughly, what difference does it make whether you use an RMA or an OA?

-Steve Gregory-

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