The heading divides on particle structure: 740610 covers powders of non-lamellar (granular or spherical) structure, while 740620 covers powders of lamellar structure — flat, plate-like particles commonly called flakes. The physical form, not the intended use, determines the subheading.

Copper powders and flakes can be subject to Section 232 tariffs depending on the specific tariff line and country of origin. Importers should verify the applicable measures at the 10-digit HTS level and confirm the country of origin before entry.