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May 2004

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Subject:
From:
Guy Ramsey <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 5 May 2004 13:55:42 -0400
Content-Type:
text/plain
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text/plain (49 lines)
We do that same thing with our J-STD-001 students. L, M, H, what does the
flux do to copper? J-STD-004.
I saw a WS flux with a caution on the label stating that cleaning should be
initiated immediately after the soldering process, as "greening" of the
board may begin as the board cools. Ouch.


> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Wednesday, May 05, 2004 1:40 PM
> To: [log in to unmask]
> Subject: Re: [TN] Green residue.
>
>  I did an experiment this morning. I put a couple of drops of
> flux on a penny about three hours ago, and I just looked at
> it...green as grass. It was Kester ZX-2331 WS
>
> -Steve Gregory-
>
>
> > There was some soldermask touch up but not anywhere near
> the parts in
> > question. I am thinking that since the board was assembled
> in one area
> > and bagged to bring it in for cleaning that there might
> have been some
> > WS flux in the bag. That seems the most likely right now.
> >
> > -----Original Message-----
> > From: Crepeau, Phil [mailto:[log in to unmask]]
> > Sent: Wednesday, May 05, 2004 12:25 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] Green residue.
> >
> >
> > is there any chance there was solder mask touch up going on
> in this area?
> >

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