Ed,

We have always (at least for a long time) used a 95% criteria for proper
hole 'wetting'.  On a 30-hole coupon, we pass on one bad hole, fail on two.
Seems to work ok for us and our board suppliers. (We also require an
artificial aging of the test coupons before solder float to ensure adequate
shelf life.)

Ralph Vaughan
Boeing-Atlanta

> ----------
> From:         Ed Cosper[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Ed Cosper
> Sent:         Thursday, September 10, 1998 5:03 PM
> To:   [log in to unmask]
> Subject:      [TN] solderability testing
>
> Hi all,
>
> Just a quick question. As a board manufacture we typically perform a
> solderability test ( solder float ) on a small piece cut out of a board
> that has at least 30 holes. Customers many times will
> run a complete bare board thru the wave to check solderability. I have a
> situation with one customer that I has frequent rejections because one or
> two holes out of hundreds do not fill during the wave of the bare boards.
> All of my solder float tests pass and samples fromt the same lots rejected
> ran over someone elses wave solder fine.
>
> I would like to know what most people would accept on that type of
> solderability test. Specifically regarding instances of when one or two
> isolated holes fail to fill out of several hundred holes on a 5x8 board. I
> really do not know if I should expect all holes to fill 100% without
> leads.  Is there a specific specification that covers wave solder tests on
> complete bare boards?
>
> Any help would be appreciated.
>
> Ed Cosper
>
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