2620.99.50.00 - Slag containing by weight over 40 percent titanium, and which if containing over 2 percent by weight of copper, lead, or zinc is not to be treated for the recovery thereof

This classification, HTS Code 2620.99.50.00, pertains to slag, ash, and residues, excluding those from iron or steel manufacturing, which contain arsenic or metals/their compounds. Specifically, this category covers materials that have a titanium content exceeding 40 percent by weight. Crucially, the classification applies only if these titanium-rich slags do not exceed 2 percent by weight of copper, lead, or zinc, or if they do exceed these limits but are not intended for the recovery of those specific metals.

Distinguishing this category from its siblings, it is important to note the specific thresholds and exclusions. For instance, sibling category 2620.99.10.00 deals with slag primarily containing vanadium, while 2620.99.20.00 focuses on tungsten. Materials with over 10 percent nickel are classified under 2620.99.30.00. Furthermore, 2620.99.75 addresses other residues not advanced in value or condition, with specific conditions regarding copper, lead, or zinc content, while 2620.99.85.00 is for any remaining "other" materials not otherwise specified. This particular sub-heading uniquely zeroes in on titanium-rich slag with stringent conditions regarding its copper, lead, and zinc composition and intended use. As a leaf node, there are no further subdivisions within this HTS code.