2919.90.50.50 - Other

This HTS category, 2919.90.50.50, encompasses phosphoric esters and their salts, as well as their halogenated, sulfonated, nitrated, or nitrosated derivatives, that do not fall under the more specific plasticizer classification (2919.90.50.10). Essentially, it serves as a residual category for organophosphorus compounds that are esters of phosphoric acid or related salts, but lack the primary function of plasticizing polymers. The goods within this classification are diverse and can include substances used in various industrial applications, such as flame retardants, hydraulic fluids, or intermediates in the synthesis of other chemical products.

Distinguishing this category from its sibling, 2919.90.50.10, hinges on the primary intended use and functional properties of the chemical. While both fall under the broader umbrella of phosphoric esters and their derivatives, the "Plasticizers" category specifically covers those compounds whose principal role is to increase the plasticity or flexibility of polymers. Therefore, if a phosphoric ester or its derivative is not primarily functioning as a plasticizer, it would likely be classified under this "Other" category.

As this is a leaf node, there are no further subcategories within 2919.90.50.50. Classification at this level requires careful consideration of the specific chemical structure and its properties against the definitions provided by the Harmonized System. Importers and exporters should refer to technical documentation, safety data sheets, and chemical analyses to confirm the appropriate classification, ensuring it is not more specifically classified elsewhere in Chapter 29.