2833.29 - Other:

This HTS category, 2833.29, encompasses a broad range of inorganic sulfate compounds not specifically enumerated in preceding subheadings under 2833.2. It covers sulfates of various metals, excluding those explicitly classified under more specific categories like magnesium (2833.21), aluminum (2833.22), nickel (2833.24), copper (2833.25), and barium (2833.27). The inclusion criterion is the presence of a sulfate anion ([SO4]^2-) combined with a metallic cation that is not otherwise designated.

The distinction of 2833.29 lies in its residual nature within the "Other sulfates" group. While siblings are defined by their specific metallic components, this category acts as a catch-all for metallic sulfates not meeting those specific criteria. Therefore, a key classification consideration involves confirming that the sulfate in question does not fall under any of the more precisely defined sibling categories.

Further subdivision within 2833.29 is based on the specific metal cation present in the sulfate compound. The subcategories (e.g., 2833.29.10 for cobalt, 2833.29.20 for iron, 2833.29.40 for chromium, and 2833.29.45 for zinc) allow for a more granular classification of these remaining metallic sulfates. The final subheading, 2833.29.51, serves as a residual for any metallic sulfates not otherwise specified within this 2833.29 group, ensuring comprehensive coverage of inorganic sulfates.