2826.90.90 - Other

This HTS category, 2826.90.90, encompasses complex fluorine salts that are not specifically classified elsewhere within the heading for fluorides, fluorosilicates, fluoroaluminates, and other complex fluorine salts. It serves as a residual category for compounds that fit the broad definition of complex fluorine salts but do not fall under more specific subheadings, such as those for fluorosilicates of sodium or potassium.

The key distinction for this category lies in its residual nature. While sibling categories may specify particular elements or types of complex salts (e.g., 2826.90.10 for sodium or potassium fluorosilicates), 2826.90.90 is reserved for other complex fluorine salts that do not have dedicated classifications. Classification here relies on determining that a fluorine compound is indeed a complex salt and that it does not meet the criteria for more precisely defined categories.

This "Other" category is further subdivided to provide more granular classification for specific, important complex fluorine salts. For instance, the subheading 2826.90.90.10 specifically covers lithium hexafluorophosphate, a critical component in lithium-ion battery electrolytes. This demonstrates how the broader residual category allows for the precise identification of commercially significant complex fluorine salts that warrant their own distinct classification.