2811.29.30.00 - Sulfur dioxide

This classification covers sulfur dioxide (SO2), an inorganic compound falling under the broader category of other inorganic oxygen compounds of nonmetals. Sulfur dioxide is a gas at standard temperature and pressure, characterized by its pungent odor and its common uses as a reducing agent, a disinfectant, and a refrigerant. Within the HTS, this specific code is designated for pure or technically pure sulfur dioxide, as opposed to mixtures or compounds where it is a secondary component.

Distinct from its sibling categories, this code specifically identifies sulfur dioxide. Arsenic trioxide (2811.29.10.00) and selenium dioxide (2811.29.20.00) are separate inorganic oxygen compounds of nonmetals, each with unique chemical properties and applications, and are classified under distinct HTS codes. The residual category, "Other" (2811.29.50.00), captures any other inorganic oxygen compounds of nonmetals not specifically enumerated elsewhere at this level.

As this node represents a leaf category within the HTS, there are no further subcategories. The classification of sulfur dioxide at 2811.29.30.00 is final. Classification decisions for this product will hinge on its identification as sulfur dioxide and its status as an inorganic oxygen compound of a nonmetal, distinguishing it from other similar but chemically distinct substances.