via copper thickness

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hello every body . when the thickness of our board is 1 oz the thickness of copper in the via barrel is 1 oz too or it is less? why?

[qdrives]

It is less.
With the outer layer copper there is first the base copper (often 1/2 oz for 1oz board, or 18um for a 35um board in metric). That is made thicker through the plating needed to get copper inside the via barrels.
Perhaps this video explains it: https://www.youtube.com/watch?v=ukfsupePkOM

Anyhow, for a class 2 board it should be a minimum of 20um. For class 3 it should be a minimum of 25um.
Another source is https://www.eurocircuits.com/toleran...per-thickness/

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@qdrives igot it . thank you very much