Why is the copper thickness in PCB an ounce

Specifically, the conversion method of length and thickness is as follows:

First, we all know that the density constant of copper and therefore the relevant unit conversion formula are as follows:

The density of copper p =8.9g/cm3

1 cm (cm) =10 mm (mm); 1 mm (mm) =1000 micron (um)

1 mil material 25.4 um

1 FT2 material 929.0304 cm2

1 mil material 25.4 um

According to the mass calculation formula m = rho ×V (volume) = rho ×S (area) ×t (thickness), know the load of copper foil divided by the density of copper and therefore the area is that the thickness of copper foil.

As previously known, 1OZ=t×929.0304cm2×8.9g/ cm3=28.35g

So, t = 28.35/ 929.0304/ 8.9 cm ≈ 0.0034287 cm = 34.287 um material 34.287/ 25.4 mil≈ 1.35 mil

Therefore, the thickness of 1OZ copper foil is about 35um or 1.35mil.

Copper thickness 1.OZ(0.035mm) copper thickness 1.5OZ(0.05mm) copper thickness 2.OZ(0.07mm)

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