3204.20 - Synthetic organic products of a kind used as fluorescent brightening agents:

HTS code 3204.20 encompasses synthetic organic products specifically designed for use as fluorescent brightening agents. These substances are characterized by their ability to absorb ultraviolet light and re-emit it as visible blue light, making materials appear whiter and brighter. They are commonly incorporated into a wide range of products, including textiles, paper, plastics, detergents, and coatings, to enhance their visual appeal.

This category is distinct from its sibling, 3204.10, which covers synthetic organic coloring matter and preparations. While both fall under the broader heading of synthetic organic colorants and related products, 3204.20 is exclusively for agents that brighten by fluorescence, rather than imparting color. The sibling category 3204.90 addresses other synthetic organic products that are not coloring matter or fluorescent brightening agents.

The subcategories within 3204.20 further refine the classification based on the specific chemical nature or common trade names of the fluorescent brightening agents. For instance, 3204.20.40 specifically identifies benzoxazol derivatives, a common class of fluorescent brighteners. The remaining subcategories, 3204.20.10 and 3204.20.80, capture other types of fluorescent brightening agents and those not otherwise specified, allowing for detailed tracking and tariff application.