Let's do the math for a raspberry pi sized board:
Dimensions: 85 mm x 56 mm
Area: 4760 mm^2 or 7.38 in^2
Copper: 4 x 1oz layers
Copper Weight: 0.205 oz = 0.013lb
Copper price: 0.013 * $4.50/lb = $0.0585
And that doesn't include the copper removed by etching. So if they paid a 6c tariff on each raspberry pi board, they'd be overpaying.
Can they generate a certificate claiming each board contains no more than this amount of copper, overpay the tariff by a few pennies, and carry on?
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