7410.12.00.30 - Of copper-zinc base alloys (brass)

This HTS category, 7410.12.00.30, specifically covers copper foil that is not backed by other materials and is composed of copper-zinc base alloys, commonly known as brass. The foil's thickness, excluding any backing material, must not exceed 0.15 mm. This classification is for unalloyed copper foil, or foil from other copper alloys, which falls under the broader heading of copper foil.

Distinguishing this category from its sibling, 7410.12.00.60 (Other), is the specific material composition. While both fall under "Of copper alloys" and are unbacked foils not exceeding 0.15 mm in thickness, this classification is exclusively for brass. The "Other" category would encompass foils made from copper alloys other than brass.

As this is a leaf node in the HTS, there are no further subcategories. Therefore, the classification hinges on the precise definition of brass as a copper-zinc base alloy and the physical characteristics of the foil, namely its unbacked nature and specified thickness limit.