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March 2018

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Subject:
From:
David Hillman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, David Hillman <[log in to unmask]>
Date:
Tue, 20 Mar 2018 15:30:33 -0500
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Hi Rich - as part of the IPC-JSTD-001 Conformal Coating Coverage/Thickness
"State of the Industry" Assessment task group efforts, we reviewed the
available conformal coating measurement/inspection equipment in an effort
to make our measurement tasks consistent and repeatable. We were unable to
identify any system that could make the conformal coating
thickness/coverage measurements we wanted so we resorted to using
metallographic cross-section techniques (very slow but accurate). That was
three years ago so hopefully a new system exists that can meet your needs.

Dave Hillman
Rockwell Collins
[log in to unmask]


On Tue, Mar 20, 2018 at 11:00 AM, Richard Kraszewski <
[log in to unmask]> wrote:

> Several years back we had run-off  for AOI equipment  to inspect for
> coating defects.  Had 2 equipment providers bring equipment on site and
> worked with them for several weeks.
> The results were rather disappointing  in that neither was reliable
> enough  to replace an human inspector.
> Seemed like the defects that the systems could collect  needed to be
> rather gross and obvious.
> Could not  reliably identify those smaller scale defects (bubbles between
> leads, FOD, thick fillets, etc.) that class 3 customers seemed to also care
> about.
>
> Would appreciate  any supporting  or contradicting experiences anyone is
> willing to share.
>
> Thanks
>
> Rich  Kraszewski
> Senior Staff Process Engineer
> Plexus
>
>
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