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December 2008

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Subject:
From:
Kevin Glidden <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kevin Glidden <[log in to unmask]>
Date:
Wed, 17 Dec 2008 09:16:54 -0500
Content-Type:
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"Alcohol will dissolve the flux..."


Is that accurate?  I am under the impression that alcohol is a solvent that
will assist in loosening RMA residues, but it will not dissolve them....at
least that is how I understand it....
 

Kevin Glidden
Manufacturing Engineer
Luminescent Systems Inc.

-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]] 
Sent: Tuesday, December 16, 2008 10:48 PM
To: [log in to unmask]
Subject: Re: [TN] flux and board cleaning issues

Alcohol will dissolve the flux. Compressed air will move the mixture. 
One must wonder where it goes. Compressed air can be present an electric
potential to the board.
It may work fine . . . Or not. Your instructor was probably taught about the
potential problems with this cleaning method. The brush is probably not as
effective as the compressed air. 

Are there any ESDS devices on the board?  

-----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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