I've seen this defect remove the hair of a good process engineer at a
previous employer. Ground plane copper with any residual moisture then add
LPI and the result is peeling/flaking soldermask.
We did not have an option for pumice, but the alternative oxide processes
created a great surface prep prior to LPI mask. Not to mention the chemistry
is stable and dirt cheap. In my old days I remember people describing pumice
scrubbers as capable of 'eating themselves slowly', I'm unsure of costs
related to keeping one satisfied to chewing on the panels instead.
>From: Franklin D Asbell <[log in to unmask]>
>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>, Franklin
>D Asbell <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [TN] Solder Mask Flaking
>Date: Wed, 11 Feb 2004 07:33:53 -0600
>
>Totally agree...
>
>
>----- Original Message -----
>From: "Brian Ellis" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Wednesday, February 11, 2004 2:16 AM
>Subject: Re: [TN] Solder Mask Flaking
>
>
> > The key is post pumice rinse/clean/dry...the boards need to exit the
> > machine spotless... and poorly solderable!
> >
> > Brian
> >
> > Franklin D Asbell wrote:
> >
> > > Tony,
> > >
> > > Do you have a pumice scrubber? We use an Hyoki aluminum oxide pumice
> > > scrubber prior to solder mask. Since buying this machine our problems
>with
> > > solder mask have dropped off to near nothing.
> > >
> > > We did tests some time back when we were evaluating different masks,
>we
> > > coated an 18X24 panel after pumice scrub...it came out nice and flat,
> > > smooth, even, etc etc etc...we could not have achieved those results
>without
> > > it I'm sure...
> > >
> > > The key is post pumice rinse/clean/dry...the boards need to exit the
>machine
> > > spotless...
> > >
> > > Franklin
> > >
> > > ---------------------------------------------------
> > > Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> > > To unsubscribe, send a message to [log in to unmask] with following text
>in
> > > the BODY (NOT the subject field): SIGNOFF Technet
> > > To temporarily halt or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
> > > To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
> > > Search the archives of previous posts at:
>http://listserv.ipc.org/archives
> > > Please visit IPC web site
>http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
>information,
>or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
> > > -----------------------------------------------------
> > >
> > >
> >
> > ---------------------------------------------------
> > Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> > To unsubscribe, send a message to [log in to unmask] with following text
>in
> > the BODY (NOT the subject field): SIGNOFF Technet
> > To temporarily halt or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
> > To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
> > Search the archives of previous posts at:
>http://listserv.ipc.org/archives
> > Please visit IPC web site
>http://www.ipc.org/contentpage.asp?Pageid=4.3.16
>for additional information, or contact Keach Sasamori at [log in to unmask] or
>847-509-9700 ext.5315
> > -----------------------------------------------------
> >
> >
> >
>
>---------------------------------------------------
>Technet Mail List provided as a service by IPC using LISTSERV 1.8e
>To unsubscribe, send a message to [log in to unmask] with following text in
>the BODY (NOT the subject field): SIGNOFF Technet
>To temporarily halt or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
>To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at: http://listserv.ipc.org/archives
>Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
>for additional information, or contact Keach Sasamori at [log in to unmask] or
>847-509-9700 ext.5315
>-----------------------------------------------------
_________________________________________________________________
Check out the great features of the new MSN 9 Dial-up, with the MSN Dial-up
Accelerator. http://click.atdmt.com/AVE/go/onm00200361ave/direct/01/
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
|
