What that most low relative permeability one skin depth larger 0.112 inch?
Material Resistivity (10 −6 ohm-inches) Relative permeability Skin depth, inches Surface resistance, Relative to copper
Induction cooking
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Cookware
Skin depth at 24 kHz
Carbon steel 1010 9 200 0.004 56.25
Stainless steel 432 24.5 200 0.007 87.5
Stainless steel 304 29 1 0.112 6.5
Aluminum 1.12 1 0.022 1.28
Copper 0.68 1 0.017 1
SELECT MIN Relative permeability FROM table WHERE Skin depth, inches > 0.112
0.112