2620.99.30.00 - Materials not provided for elsewhere in this heading containing by weight over 10 percent nickel

This HTS classification covers residual materials not specifically listed elsewhere within heading 2620, which contain nickel in a proportion exceeding 10 percent by weight. These are distinct from the general category of slag, ash, and residues covered by heading 2620. The key defining characteristic for this subcategory is the significant presence of nickel, distinguishing it from residues primarily containing other metals or elements.

Unlike sibling categories that focus on specific primary constituents such as vanadium (2620.99.10.00) or tungsten (2620.99.20.00), or those with specific compositions and conditions related to titanium (2620.99.50.00) or general undifferentiated residues (2620.99.75 and 2620.99.85.00), this category specifically targets nickel-rich materials. The classification hinges on the quantitative threshold of over 10 percent nickel by weight, irrespective of other trace elements present.

As this is a leaf node within the HTS structure, there are no further subcategories. Therefore, practical classification relies on accurate assaying to confirm the nickel content. Examples of materials that might fall under this classification could include certain types of spent catalysts, industrial sludges, or waste products from metallurgical processes that are not otherwise specified and meet the 10 percent nickel threshold.