3402.42 - Non-ionic:

This HTS category, 3402.42, specifically addresses non-ionic organic surface-active agents and preparations. These substances are characterized by their lack of an electrical charge when dissolved in water, distinguishing them from cationic and anionic (though not explicitly listed as siblings here) surface-active agents. Non-ionic surfactants are widely used in a variety of applications due to their excellent wetting, emulsifying, and dispersing properties, often exhibiting good compatibility with other types of surfactants and electrolytes.

Within heading 3402, this sub-heading differentiates itself from sibling categories like cationic (3402.41) and other (3402.49) organic surface-active agents. The crucial distinction lies in the electrical charge (or lack thereof) of the hydrophilic head group of the molecule. Non-ionic surfactants are thus grouped based on this fundamental chemical characteristic, impacting their performance and suitability for specific industrial and consumer product formulations.

The subcategories under 3402.42 further refine the classification of these non-ionic agents. The distinction between "Aromatic or modified aromatic" (3402.42.10.00) and "Other" reflects the chemical structure of the aromatic component of the surfactant molecule. This level of detail is critical for accurate tariff assessment, as variations in the chemical backbone can influence the product's properties, intended use, and ultimately, its classification for customs purposes.