7903.90 - Other:

This HTS category, 7903.90, encompasses zinc in forms other than pure zinc dust. It broadly covers various presentations of zinc that do not specifically fall under the classification for zinc dust (7903.10.00.00). This includes materials such as zinc flakes, granulated zinc, and other particulate forms of zinc that are distinct from fine dust.

The primary distinction from the sibling category 7903.10.00.00, "Zinc dust," lies in the physical characteristics and particle size. Zinc dust is characterized by its extremely fine, powder-like nature, typically formed by atomization. Category 7903.90, however, captures larger particle sizes or different morphologies, such as zinc in flake form, which are visually and physically distinct from a fine powder.

Within this category, further subclassification exists to refine the specific form of zinc. Subcategory 7903.90.30.00 specifically designates zinc in powder form, which may include granular powders or other non-dust particulate forms. The remaining classifications under 7903.90.60.00 cover all other forms of zinc that are not dust and not specifically categorized as powders, such as zinc flakes or irregular particulate material. This hierarchical structure allows for precise identification based on the physical presentation of the zinc.