7606.91 - Of aluminum, not alloyed:

This HTS category, 7606.91, specifically addresses aluminum plates, sheets, and strip that exceed 0.2 mm in thickness and are not alloyed. This means the material is primarily pure aluminum, without significant additions of other metals to alter its properties. These products are generally characterized by their form (flat, rectangular, or shaped) and their thickness, serving a wide range of industrial and manufacturing applications where the inherent properties of unalloyed aluminum are desired.

The key differentiator for this subcategory lies in the composition of the aluminum. It is explicitly contrasted with HTS 7606.92, which covers similar plates, sheets, and strip, but those made from aluminum alloys. Therefore, the presence or absence of alloying elements in the aluminum is the primary classification criterion at this level, distinguishing between pure aluminum products and those engineered with specific metallic additions for enhanced strength, corrosion resistance, or other characteristics.

Within this category, further distinction is made based on whether the aluminum product is clad. Subcategory 7606.91.30 covers unalloyed aluminum plates, sheets, and strip that are not clad, meaning they consist solely of the unalloyed aluminum material throughout their thickness. In contrast, 7606.91.60 includes products where the unalloyed aluminum is bonded to other materials, typically to impart specific surface properties or structural benefits. This cladding distinction is crucial for accurate customs declarations.