Copper thickness in a PCB

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Sakr

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pcb copper thickness in microns

Hi all,

I am new in the field of PCB design, and there are many things I want to know
for example

When stating the Copper thikness, why we use oz. (it is a unit of mass, as I know)?
I can't understand this point if I said I need 1 oz. Cu the thickness will depend on the width to preserve a constant mass (1 oz.)!!!!!

why we don't just use mm? are there historical reasons, or some thing like that?!!!!

Regards,
Sakr
 

In the PCB terminology 1 Oz copper is 35 Microns, 2 Oz is 70 Microns and so on
 

    Sakr

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The ounce term comes from the ounces of copper to plate one square foot. It is a "plating weight", not a weight for each trace or fill.

As far as a board designer is concerned, you can use the accepted thicknesses for your impedance or current calculations - 1.4mil (35micron)=1oz Cu, 0.7mil (17.5micron)=1/2oz Cu, etc.
 

    Sakr

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