2804.29.00.20 - Neon

This HTS category, 2804.29.00.20, specifically classifies Neon, a noble gas. Neon is characterized by its inertness and its distinct reddish-orange glow when an electric current is passed through it at low pressure, making it recognizable for its applications in lighting and signage. It falls within the broader classification of "Other rare gases" under Chapter 28, which encompasses inorganic chemicals.

Distinguishing this category from its siblings, 2804.29.00.10 covers Helium, another rare gas, and 2804.29.00.30 addresses isotopically pure rare gases exceeding 99 percent purity. While Helium is a distinct element, the distinction for 2804.29.00.30 lies in the high isotopic purity, which is not the primary classification criterion for Neon under 2804.29.00.20. Category 2804.29.00.55 serves as a residual classification for any other rare gases not specifically enumerated.

As this is a leaf node in the HTS classification, there are no further subcategories. Therefore, the classification of Neon under 2804.29.00.20 is definitive for this specific rare gas, based on its elemental identity and chemical properties rather than further subdivisions in purity or isotopic composition.