3402.49.90.00 - Other

This HTS category, 3402.49.90.00, encompasses "Other" organic surface-active agents not specifically listed in preceding subheadings. It serves as a residual category for agents that exhibit surface-active properties but do not fall under more specific classifications such as those for aromatic or modified aromatic compounds. These may include non-ionic, anionic, or cationic surface-active agents, as well as amphoteric agents, that do not possess distinct aromatic characteristics.

This subheading is distinguished from its sibling, 3402.49.10.00, by the absence of aromatic or modified aromatic molecular structures. While both subheadings fall under "Other organic surface-active agents," the key differentiating factor is the chemical composition. Category 3402.49.90.00 is therefore reserved for surface-active agents whose base structure is not aromatic in nature.

As a leaf node in the HTS classification structure, this category does not have subcategories. Therefore, classification within 3402.49.90.00 relies on a thorough understanding of the definitions of surface-active agents and the exclusion criteria of preceding headings and subheadings. Practical classification will involve examining the chemical structure, function, and application of the product to ensure it meets the general definition of an organic surface-active agent while not fitting any more specific description.