2804.90.00.00 - Selenium

The HTS code 2804.90.00.00 specifically classifies Selenium, a metalloid element. Within Chapter 28, which covers inorganic chemicals, this code is situated under the broader heading of "Hydrogen, rare gases and other nonmetals." Selenium is recognized for its unique semiconductor properties and is utilized in a variety of industrial applications, including in the manufacture of glass, pigments, and electronic components.

This classification distinguishes Selenium from its sibling categories, such as Hydrogen (2804.10), Nitrogen (2804.30), Oxygen (2804.40), and Boron/Tellurium (2804.50). While all are nonmetallic elements, Selenium possesses distinct chemical and physical properties that necessitate its separate categorization, primarily its semiconducting nature and its role in photoelectric applications, unlike the more common atmospheric gases or lighter nonmetals.

As a leaf node in the HTS database, 2804.90.00.00 has no further subdivisions. Therefore, classification under this code pertains to Selenium in its elemental form, whether it is in powder, lump, or other basic physical states, as typically traded for industrial processing. The focus remains on identifying the pure elemental substance itself, rather than compounds or mixtures where Selenium might be a constituent part.