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September 1999

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Subject:
From:
Graham Naisbitt <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 3 Sep 1999 15:43:16 +0100
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text/plain
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Steve,

30% concentration of Kyzen? Is this stuff pre-diluted?

It is my experience that good cleaning will result at concentrations of less
than 10%. Most folks I know would prefer to run at less than 5%, 'cos it
costs less - but 30%??

Please enlighten me or have I missed the plot.....

Regards,
Graham Naisbitt

[log in to unmask]

WEB: http://www.concoat.co.uk

CONCOAT Ltd
Alasan House, Albany Park
CAMBERLEY GU15 2PL UK

Tel: +44 (0) 1276 691100  Fax: +44 (0) 1276 691227
----- Original Message -----
From: Stephen R. Gregory <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, September 02, 1999 7:16 PM
Subject: [TN] Dryfilm mask adhesion, the saga continues...


> Hi ya'll!
>
> Well, I'm making some progress about this mask flaking deal. So I thought
I'd
> share what I've learned thus far. To refresh, I have a board here that
loses
> all it's mask off of every bit of copper after 3-4 washes in a Electrovert
> MCS-1000 cleaner that we run Kyzen Aquanox XJN in at a 30% concentration.
The
> board is assembled with RMA based flux, that's why the Kyzen. The wash is
> 140º F., and the rinse is 120º F.
>
> The fab vendor says it's our cleaning process that's doing it, but I first
> contended that it's either the mask, or the masking process. They came
back
> and pointed out that we're assembling 3 other boards with dryfilm mask, so
> why isn't there problems with the other 3 assemblies? So I says;
> hmmmm...(babbling to myself as usual...hehehe)
>
> There is one difference between the flakey board and the other three, the
> flakey board is a PCI card that has gold plated fingers while the other 3
> doesn't have any gold plated on them at all...
>
> But I went back in the stockroom and looked at the bare fabs of the other
3,
> and could obviously see that a different brand dryfilm mask had been used
> with them.
> After a conference call today with the fab vendor, we did find out that
there
> WAS two different masks being used. I'm not trying to slam any mask over
the
> other, just relating my experiences, but the flakey mask is a DynaChem KM,
> and the other is a Dupont 8140. They said they would switch over to the
> Dupont mask....(I'm thinkin' to myself, WHY didn't they do that months ago
> when all this started? Especially since they built 3-different lots of
boards
> with the DynaChem mask after first receiving the first complaints? They
had
> at least TWO chanches to switch! But nooooo...)
>
> The $30,000 dollars we got into components and assembly labor on boards
that
> have bare-naked traces and vias is still being contested, because they
said
> they complied with the drawing since no certain mask was specified, just
the
> IPC spec, basically  saying that's it's our problem we use Kyzen Aquanox
XJN.
> Sounds kinda' lame to me, but thank goodness at least I'm outta that loop!
>
> Least now I know what kinda dryfilm mask NOT to use with Kyzen (I'd rather
> not have to deal with dryfilm at all, but whatcha gonna do?)
>
> -Steve Gregory-
>
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