Why is the thickness of PCB copper foil in ounces? After reading this, I finally understand! 2023-11-24 Density of copper ρ = 8.9 g/cm31 centimeter (cm) = 10 millimeters (mm); 1 millimeter (mm) = 1000 microns (um)1mil≈25.4um1 FT2≈929.0304cm21mil ≈ 25.4umBased on t... Continue Reading →