Both crude and processed silicon carbide fall under subheading 284920, so the distinction does not change the 6-digit classification. At the 10-digit US tariff-line level, however, the degree of processing can affect the applicable rate and any trade-remedy exposure, so importers should verify the specific tariff line with a licensed customs broker.

Yes. Certain silicon carbide and tungsten carbide lines from China have been subject to antidumping duties and Section 301 measures. The applicable measure depends on the specific 10-digit tariff line and the country of origin, so importers should check the current scope orders and Section 301 annexes before entry.