2620.40.00 - Containing mainly aluminum

This category, HTS 2620.40.00, specifically addresses slag, ash, and residues (other than those originating from iron or steel production) that are characterized by their primary aluminum content. These materials are typically by-products of industrial processes, such as smelting, refining, or waste treatment, where aluminum is a significant component of the residual material.

Distinguishing this category from its siblings is crucial for accurate classification. Unlike the categories for zinc (2620.10), lead (2620.20), or copper (2620.30), the defining characteristic here is the predominant presence of aluminum. Furthermore, this category is separate from those containing arsenic, mercury, or thallium (2620.60), which are classified based on those specific metalloids or metals and their particular uses. The "Other" sibling category would encompass residues not primarily containing aluminum, zinc, lead, copper, or the specified metalloids/metals.

Within HTS 2620.40.00, further subdivisions exist to refine classification based on specific elements present. The subcategory 2620.40.00.30 applies to residues containing mainly aluminum that also bear vanadium, indicating a specific focus for potential recovery or specific industrial properties. The subcategory 2620.40.00.60 serves as a residual classification for other aluminum-bearing residues that do not fit the vanadium-bearing description, ensuring comprehensive coverage.