2812 - Halides and halide oxides of nonmetals:

This HTS category, 2812, encompasses halides and halide oxides of nonmetals. These are chemical compounds where a nonmetallic element is bonded to a halogen (such as chlorine, bromine, or iodine) or where a nonmetal forms an oxide with a halogen. Examples include compounds like phosphorus trichloride (PCl₃), sulfuryl chloride (SO₂Cl₂), or arsenic tribromide (AsBr₃). These substances often serve as intermediates in chemical synthesis, reagents in analytical chemistry, or components in specialized industrial processes.

Distinguishing this category from its siblings is crucial for accurate classification. Unlike Chapter 01 which deals with live animals, or other chapters within Section VI that cover metals, minerals, or organic compounds, Chapter 28 specifically focuses on inorganic chemicals. Within Chapter 28, 2812 differentiates itself from other inorganic compounds by its specific focus on halogenated nonmetals and their oxides, rather than acids, bases, salts, or elemental nonmetals.

The subcategories within 2812 further refine classification based on the specific halogen and oxide structure. For instance, 2812.10 covers chlorides and chloride oxides of nonmetals, which are distinct from bromides, iodides, or fluorides. The residual category, 2812.90, is reserved for all other halides and halide oxides of nonmetals not specifically enumerated elsewhere within the 2812 heading, ensuring comprehensive coverage for these specialized chemical products.