9902.05.20 - Thiourea dioxide (Amino(imino)methanesulfinic acid) (CAS No. 1758-73-2) (provided for in subheading 2930.90.49)

This HTS category, 9902.05.20, specifically covers Thiourea dioxide, also known by its chemical name amino(imino)methanesulfinic acid. This designation is applied to this chemical when it is provided for under a temporary legislation or modification within Chapter 99 of the Harmonized Tariff Schedule. Importantly, this classification is a temporary one, indicating that the standard classification for Thiourea dioxide is found elsewhere, specifically under subheading 2930.90.49. The inclusion in Chapter 99 signifies that specific duties or restrictions, often related to trade agreements or agricultural adjustments, may apply to its importation.

As this is a leaf node within the HTS structure, there are no further subcategories to explore. The distinction from sibling categories, which are numerous and cover a wide range of goods from live animals to various manufactured products, is primarily based on the specific chemical identity of Thiourea dioxide and its current temporary classification status. Unlike the vast majority of HTS entries which represent permanent tariff headings, this category highlights a transient trade measure or duty adjustment applicable to this particular chemical compound. Its purpose is to manage the import of Thiourea dioxide under specific policy directives rather than to categorize its fundamental nature as a chemical substance.