2829.90.40.00 - Of potassium

This HTS subheading, 2829.90.40.00, specifically classifies inorganic salts of iodates and periodates where the cation is potassium. These compounds are characterized by the presence of potassium ions bonded to either iodate (IO₃⁻) or periodate (IO₄⁻) anions. Examples include potassium iodate (KIO₃) and potassium periodate (KIO₄), often utilized in various chemical applications such as oxidizing agents, analytical reagents, and in the production of other iodine-containing compounds.

Within the broader category of "Other" iodates and periodates not elsewhere specified, this subheading distinguishes itself by the presence of potassium as the sole metallic cation. Other subheadings at this level, such as 2829.90.61.00, would encompass iodates and periodates with different metallic cations (e.g., sodium, calcium) or those that are not alkali metal salts. The focus here is strictly on potassium-based compounds.

As a leaf node, this classification does not have further subdivisions. Therefore, its scope is precisely defined by the chemical composition: iodates or periodates in combination with potassium. Classification decisions within this subheading should primarily rely on the chemical identification of the imported substance to confirm the presence of potassium alongside the iodate or periodate anion.