2919.90.25.00 - Other

This HTS subcategory, 2919.90.25.00, encompasses plasticizers derived from phosphoric esters and their salts, excluding those that are specifically aromatic. These substances are primarily used to increase the plasticity or fluidity of materials, particularly polymers and plastics, by reducing their viscosity when heated. They function by embedding themselves between polymer chains, allowing them to slide past each other more easily.

Distinguishing this category from its sibling, 2919.90.15.00 (Triphenyl phosphate), is crucial. While triphenyl phosphate is a specific aromatic phosphoric ester used as a plasticizer, this current classification is for *other* plasticizers within the broader category of phosphoric esters, specifically excluding those with an aromatic structure. This means that any phosphoric ester-based plasticizer that is not triphenyl phosphate and does not possess aromatic properties would fall under this heading.

As this is a leaf node, there are no further subcategories. Therefore, classification within 2919.90.25.00 relies on identifying a product as a phosphoric ester or its salt, functioning as a plasticizer, and confirming that it is neither triphenyl phosphate nor an aromatic derivative. Practical considerations for classification would include reviewing product specifications, chemical analyses, and intended use documentation to verify these criteria.