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December 2008

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Subject:
From:
Lee Whiteman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 17 Dec 2008 08:15:15 -0500
Content-Type:
text/plain
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text/plain (109 lines)
Have you considered using some Microcare products? They may be more effective in removing flux via hand cleaning than IPA. Compressed air can be used, but it represents an ESD problem unless you are using a nozzle that is grounded.

It has been my experience that IPA would dilute the flux residues but not necessarily remove them. It also depends on the time between soldering and cleaning. The shorter the time, the easier it is to remove the flux.

Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
 
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wilson, Bob
Sent: Tuesday, December 16, 2008 7:12 PM
To: [log in to unmask]
Subject: Re: [TN] flux and board cleaning issues

Rosin Mildly Activated

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: Tuesday, December 16, 2008 4:04 PM
To: [log in to unmask]
Subject: Re: [TN] flux and board cleaning issues

Bob:  Why not advise on the type of flux you are using.

Rudy Sedlak
RD Chemical Company

--- On Tue, 12/16/08, Wilson, Bob <[log in to unmask]> wrote:
From: Wilson, Bob <[log in to unmask]>
Subject: [TN] flux and board cleaning issues
To: [log in to unmask]
Date: Tuesday, December 16, 2008, 3:55 PM

Hi,

I have a lead who is an IPC J-STD-001 certified trainer and she is very
good.  We are using a board assembly that has a nut plate under a
high-density 26-pin DSUB.

The girls were soaking the assemblies in an alcohol bath and the lead
assembler said she didn't want the boards soaked in alcohol because it
isn't 100% guaranteed to remove all the flux from under the connector or
nut plate.

She has the girls trying to get a brush under there to get the flux out.

Am I nuts or have I been under the wrong impression that alcohol and
compressed air is the best way to clean a fluxed board?  I hate the idea
of me saying something like, "But...but that's the way we've
always done
it!"

(I don't have J-STD-001 here on the design side).

Thanks a bunch.

Bob Wilson

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