Hi Steve,

Usually, 1/2 (half) Oz/sq Ft,  stands for 17 to 18 metric microns - the
reason being that it is used as outer layer for plating, which means we add
minimum 20 to 25 metric microns over, so the holes will have 20-25 microns
inside and the outerlayers will get 17 from the laminated + 20-25 microns in
theory = 37-42 microns.

For inner layers, or non plated PCBs usually we use 35 metric microns = 1
Oz./sq ft

Now, there a multitude of exceptions, but this is for the bulk.



Very Best Regards - Roland

www.PCBspecialist.com
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----- Message d'origine -----
De : Steve Gregory
À : [log in to unmask]
Envoyé : vendredi, 30. mai 2003 18:12
Objet : [TN] Micro-inch to copper weight conversion...


Hi All,

I got my boards back from our fab vendor (the ones that had the trace
thickness problem), and they sent the XRF measurements that they took. But
they're in microinches, is there some conversion that you do to convert that
to copper weight?

Here's the measurements that I got:

       µin Cu
1.    170.9
2.    173.0
3.    170.1
4.    170.6

Thanks in advance!

-Steve Gregory-    ---------------------------------------------------
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