2919.90.50.10 - Plasticizers

This HTS category, 2919.90.50.10, specifically encompasses "Plasticizers" within the broader classification of phosphoric esters and their salts. Plasticizers are additives that increase the plasticity or fluidity of a material, primarily plastics. They work by reducing the intermolecular forces between polymer chains, making the material more flexible, easier to process, and less brittle. Examples include phthalates, adipates, and various esters used to impart desired properties to PVC, rubber, and other polymers.

Distinguishing this category from its sibling, 2919.90.50.50 (Other), is crucial. While both fall under the "Other" subheading for phosphoric esters, 2919.90.50.10 is reserved for those specific chemical compounds whose primary and intended function is to act as plasticizers. The sibling category would therefore cover other "other" phosphoric esters and their derivatives that do not serve this specific purpose, even if they share structural similarities. Classification hinges on the intended use and functional property imparted to the end product.

As this is a leaf node, there are no further subcategories to introduce. Therefore, the focus remains on the precise definition and application of plasticizers that fall under this specific HTS code. Importers and exporters should carefully consider the primary function of the chemical being declared to ensure accurate classification within this dedicated plasticizer category.