2804.29.00.55 - Other

This HTS category, 2804.29.00.55, encompasses rare gases that are not specifically enumerated under preceding subheadings. This broadly includes elements belonging to Group 18 of the periodic table, such as Argon, Krypton, Xenon, and Radon, when presented in their elemental or uncompounded form. The key criterion for inclusion in this category is the absence of classification under the more specific headings for Helium, Neon, or isotopically pure rare gases.

Distinguishing this category from its siblings is crucial for accurate classification. HTS code 2804.29.00.10 specifically covers Helium, while 2804.29.00.20 is reserved for Neon. Furthermore, 2804.29.00.30 is designated for isotopically pure rare gases with a purity of 99 percent or more by volume, implying a focus on enriched or specific isotopes rather than the naturally occurring or less pure elemental forms. Therefore, this "Other" category serves as a residual for all other rare gases meeting the general criteria of Chapter 28 but not fitting into the more narrowly defined sibling categories.

As a leaf node, this classification does not have further subcategories. Classification within 2804.29.00.55 is determined by the identity of the rare gas and its exclusion from the more specific rare gas headings. For practical purposes, this would encompass common industrial and scientific gases like Argon (Ar), which is widely used in welding and lighting, and Xenon (Xe), utilized in high-intensity discharge lamps and medical imaging. The classification relies on the inherent chemical properties and elemental identity of these nonmetals.