Hi Frank,
Plating cracks are usually due to build up of organics in the plating bath,
maybe you need to do a carbon treat. Is this an isolated case? Is it just
one hole or a number of holes on just one board? If it's an isolated case it
may not be the plating bath.
What does the hole look like when it's sectioned? Is the hole wall rough?
Protruding fibres may lead to stress raisers. Is the electroless or direct
metalisation OK ? If this isn't continuous it can lead to "plating folds"
which can separate on thermal shock.
Hope this helps.
Sounds like you need the luck of the Irish.
Geoff
> ----------
> From:         Frank Davies[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Frank Davies
> Sent:         26 September 2000 10:19
> To:   [log in to unmask]
> Subject:      [TN] Plating Cracks
>
> Just some advice if possible.  I have a board that shows a plating crack
> in the barrel and another with a plating crack at the knee (corner). The
> hole is a via .3mm with about 20 to 21 microns of plating (checked by
> micro section) This is a first this year and cannot find any cause. Could
> someone out there give me a starting point please. Thank you first.
> Frank
>

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