The importer should check the scope language of any active antidumping or countervailing duty orders published by the US Department of Commerce, as scope definitions for tungsten carbide products can be specific about form (powder, cemented, or finished parts) and grade. A customs broker or trade attorney can assist with a scope ruling request to Commerce if the product's classification under an existing order is uncertain.

Abrasive-grade silicon carbide is typically a crushed or sized powder with controlled grit distribution, used in grinding wheels, sandpaper, and blasting media. Semiconductor-grade silicon carbide wafers or boules are single-crystal or polycrystalline materials grown under tightly controlled conditions for power electronics and RF devices. While both may fall within the same SITC heading, the semiconductor form commands a substantially higher price and may be subject to different HTS subheadings at the 10-digit level.