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July 1998

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Subject:
From:
Aric parr <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 27 Jul 1998 07:27:34 EDT
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I would not put no clean in place without the "costly" QC and qualification
procedures listed below. Depending upon the end use, you could have serious
problems without it:

Qualification must include SIR testing. I have made SIR testers using
picoammeters (or floor ESD testers), multimeters, a homemade switchbox and
a regulated power supply and running wires into a temperature/humidity
chamber. (It took several tries to eliminate all the stray currents). If
you have a power supply and ESD floor tester at 100 V (and an available
chamber), testing cost should be the bare SIR boards made by your
production supplier plus a small cost to make the test box. Outside labs
will do the testing for a nominal fee.

You should also have a tester such as Ionograph, Omega meter, Ion Chaser,
Zero Ion... to do SPC on bare and assembled panels. They can detect out of
control situations such as too much flux or dirty incoming PCBs.

More testing, such as product testing at use environment, significantly
reduces risk.

If these are too expensive to put into place, don't use no clean.

P.S. If you choose the right flux, spray fluxer and paste, you don't need
nitrogen with a good design and solderable parts.

ARIC PARR
Sr. Manufacturing Engineer
Eaton Corp
1400 S. Livernois
P. O. Box 5020
Rochester Hills, Mi 48308-5020
[log in to unmask]
248 608 7780
Fax: 248 656 2242
-------------
Original Text
From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 7/25/98 4:47 AM:
To: Aric Parr@01635@Lectron_RH,
EatonWHQ@CorpMail@WHQCleveOH[C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG]

Dear sir,
        Please try the Qualitek solder paste #670S1 for SMT, it is the low
flux
residue solder paste. I have experience with it, it pass contaminant test
perform IPC standard by our cutomer. For PTH is Alpha metal, Telecore
plus1.2% flux core, 0.5% dia, this one has passed the test also. For
noclean flux removing please try Alpha metal # EC-7M.

Best regards,
Noppadol S.

At 15:00 24/7/98 -0700, you wrote:
>Hello.
>
>  I am needing a way to determine if flux residue from "no - clean" flux
>is a problem with reliablity on fr4 pcbas. IPC standards are unclear and
>suggest test methods that are excessively costly for me.  Is there any
>products that may help me determine the contamination level (cheap) or
>do you have "safe" cleaners ?.
>
>Thanks
>
>Cheyenne Noda
>[log in to unmask]
>
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