No — heading 2817 covers zinc oxide regardless of particle size, purity grade, or surface treatment, as long as it remains a chemically defined compound. Nano-scale zinc oxide still classifies here; however, if it is formulated into a preparation (e.g., a sunscreen base), it may shift to a different chapter depending on the finished product's character.

Antidumping and countervailing duty orders have been applied to zinc oxide from specific countries in the past. Importers should query the CBP ADD/CVD database and USITC orders by country of origin before each shipment, as the scope and rates can change with administrative reviews.