9902.09.09 - Surface-active preparations consisting of fatty acids, C16-C18 and C18 unsaturated, esters with pentaerythritol (CAS No. 85711-45-1); polysorbate 20 (CAS No. 9005-64-5); and polyoxyethylene dioleate (CAS No. 9005-07-6) (provided for in subheading 3402.13.20)

This HTS category, 9902.09.09, specifically addresses certain surface-active preparations with a defined composition. These preparations are comprised of three key components: fatty acids of C16-C18 chain lengths (including unsaturated variants) esterified with pentaerythritol, polysorbate 20, and polyoxyethylene dioleate. The inclusion of the CAS numbers provides precise chemical identification for these substances, reinforcing the specificity of this classification.

Unlike the broad categories of live animals found in Chapter 01, or other general chemical preparations, this subheading is highly specialized. It is not intended for basic surfactants or broad classes of esters, but rather for this exact blend of ingredients. The "99" chapter designation signifies that this is a temporary legislation or a special classification provision, likely related to trade agreements or specific import restrictions, and the parenthetical reference to subheading 3402.13.20 indicates its origin within the broader HTS framework for surfactants.

As this is a leaf node, there are no further subcategories within 9902.09.09. Classification under this provision hinges on the presence of all three specified components in the described surface-active preparation. Importers and customs brokers must ensure that the imported product precisely matches the chemical description and CAS numbers provided to avoid misclassification.