We regret but have to temporary suspend the shipments to USA

> importers must declare the exact amount of steel, copper, and aluminum in products, with a 100% tariff applied to these materials. This makes little sense—PCBs, for instance, contain copper traces, but the quantity is nearly impossible to estimate.

Wow this administration is f**ing batshit insane. I thought the tariffs would be on raw metals, not anything at all that happens to contain them.

Here is how the EU expects PCB imports...

>For PCBs shipped to the EU, a Certificate of Analysis is not typically required for determining tariffs, as tariffs are based on the HS code (e.g., 8534.00 for bare PCBs), country of origin, and customs value. However, a CoA or similar documentation (e.g., material composition report) may be needed for: Regulatory compliance with REACH or RoHS, especially if the PCBs contain restricted substances like lead or cadmium. Customs verification if the product’s classification or materials are questioned.

That is exactly the same for the U.S., with the same Harmonized code, 8534.00.

https://hts.usitc.gov/search?query=8534

...and has been that way for a long time. Only thing that might be different now is that the de-minimus import exemption is going away for (certain?) countries? (and of course the tariff rate changing).

The difference now is the US wants mail carriers to collect tarrifs themselves and pay the US government.

They have no way to do this, because it's normally not done - tarrifs are paid by the importer, and responsibility for correct labeling is by the importer.