1 oz/ft² → approximately 35 µmRounded 35 µm planning convention. Calculations may use 34.8 µm in other references; specify actual minimum finished copper instead of treating either rounded value as acceptance.1 oz/ft² → approximately 35 µmA mass-per-area label; not the thickness of the entire PCB.1 oz copper≈ 35 µm≈ 0.035 mm≈ 1.38 milBoard thickness is a separate value.³Ô¹Ïtv engineering illustration · conceptual, not to scale · examples are not acceptance limits