Dear Paul Noonan,

Paul Noonan <[log in to unmask]> on 2001-06-21 03:47:50 AM passed on the
confusing story:
>I have been fed so many
>different stories from different board shops, one in particular is saying
>that people only ever ask for 20 Microns, .0008" and that this is adequate ,
>other board shops are telling me that they always provide thicker plating
>than this.
...
>Paul Noonan

This might not be inconsistent.

If people ask board shops for what they want:
  Finished hole tolerances:
  c. Plate through hole minimum copper wall thickness 20 um ( .0008" )
  NOTE: Hole diameters apply after plating.
but the board shops always provide thicker-than-minimum plating,
then everyone should be happy.

My company still hasn't converted to metric, so most of our specs still say
  Finished hole tolerances: (IPC-6011 & IPC-6012)
  c. Plate through hole minimum copper wall thickness .001"

I doubt that makes any real difference.

--
David Cary

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