2931.90.90 - Other

This HTS category, "Other," within subheading 2931.90.90, encompasses organo-inorganic compounds that do not fit into the more specific subheadings of 2931.90. However, it's crucial to note that this "Other" classification is itself a residual category. It captures organo-inorganic compounds that are not specifically enumerated elsewhere, either within the broader Chapter 29 or at the more detailed levels within heading 2931.

To properly classify goods under 2931.90.90, it's essential to differentiate them from sibling categories. For instance, sibling category 2931.90.70.00 specifically names certain organo-inorganic compounds like N,N'-Bis(trimethylsilyl) urea and phosphonic acid derivatives. Therefore, any organo-inorganic compound not falling under the explicit descriptions of 2931.90.70.00, or any other specific listing at this level, would be considered for classification within 2931.90.90.

Given that 2931.90.90.90 serves as a residual category, it is further subdivided to provide more granular classification for specific types of organo-inorganic compounds. These subdivisions include distinct categories for organosilicon compounds (2931.90.90.10) and organotin compounds, as well as specific arsenic-containing organo-inorganic compounds like 2-Chlorovinyldichloroarsine, Bis(2-chlorovinyl)chloroarsine, and Tris(2-chlorovinyl)arsine. The residual "Other" subcategory within 2931.90.90.52 is reserved for any organo-inorganic compounds not specifically listed in the preceding subcategories or at higher levels of the HTS.