2836.99.40.00 - Lead carbonates

This HTS category, 2836.99.40.00, specifically covers lead carbonates. Lead carbonates are inorganic chemical compounds where lead is bonded to the carbonate ion. Common examples include lead(II) carbonate (PbCO₃), often referred to as cerussite when in mineral form, and basic lead carbonate (2PbCO₃·Pb(OH)₂), also known as white lead, which was historically used as a pigment. These compounds are typically insoluble in water and are primarily used in various industrial applications, such as pigments, stabilizers in plastics, and in the production of other lead compounds.

Within the broader classification of "Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate: Other: Other," this specific subheading differentiates lead carbonates from other metallic and non-metallic carbonates. It is distinct from sibling categories like cobalt carbonates (2836.99.10.00), bismuth carbonate (2836.99.20.00), and commercial and other ammonium carbonates (2836.99.30.00) due to the presence of lead as the metallic cation. The classification is based on the chemical composition, identifying the specific metal or element forming the carbonate compound.

As this is a leaf node within the HTS structure, there are no further subcategories for lead carbonates. Therefore, classification under 2836.99.40.00 is final for all goods falling under this precise description. The classification hinges on confirming the presence of lead in its carbonate form, distinguishing it from other metallic carbonates or carbonates of non-metals that are classified elsewhere.