2805.19.90 - Other

This HTS category, 2805.19.90, encompasses alkali metals other than lithium, sodium, potassium, rubidium, and cesium, when they are not intermixed or interalloyed with other elements. It serves as a residual category for these specific alkali metals that do not have their own distinct subheadings within the broader alkali and alkaline-earth metals classification.

Distinguishing this category from its siblings is crucial for accurate classification. While 2805.19.10.00 specifically covers Strontium and 2805.19.20.00 covers Barium, both of which are alkaline-earth metals, this category is focused on other alkali metals. Therefore, items classified here will not be Strontium or Barium, nor will they be the more common alkali metals like sodium or potassium which fall under different HTS subheadings.

Within this category, further subdivision exists to address specific forms or types of these "other" alkali metals. The subcategories differentiate between Lithium (2805.19.90.10) and all other remaining alkali metals that fit the general description of this heading (2805.19.90.90). This granular approach ensures precise tariff application based on the specific elemental composition of the product.