2804.21.00.00 - Argon

This classification covers argon, a noble gas that is inert and colorless under standard conditions. Argon is primarily used in industrial applications such as welding, lighting, and as a protective atmosphere in various manufacturing processes. Its chemical inertness makes it valuable where reactivity is undesirable.

Within the broader category of "Rare gases," this HTS code specifically isolates argon from other rare gases. Its sibling category, 2804.29.00, encompasses "Other" rare gases, which would include elements like helium, neon, krypton, and xenon. Therefore, classification under 2804.21.00.00 is exclusive to argon, differentiating it by its atomic composition and unique properties compared to its elemental counterparts.

As this is a leaf node in the HTS structure, there are no further subcategories for argon. Classification decisions at this level rely on confirming the commodity's identity as argon, often supported by technical specifications, certificates of analysis, or product literature detailing its purity and intended use.