# HS code 2931.90: Other organo-inorganic compounds > HS code 2931.90 covers other organo-inorganic compounds, other than those classified in 2931.10, 2931.20, 2931.41, 2931.42, 2931.43, 2931.44, 2931.45, 2931.46, 2931.47, 2931.48, 2931.49, 2931.51, 2931.52, 2931.53, 2931.54 and 2931.59. It sits in heading 29.31 (other organo-inorganic compounds) in chapter 29 (organic chemicals). Other goods of heading 29.31 are classified under 2931.10 (tetramethyl lead and tetraethyl lead), 2931.20 (tributyltin compounds), 2931.41 (non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate), 2931.42 (non-halogenated organo-phosphorous derivatives, dimethyl propylphosphonate) or 12 others. National tariff lines under 2931.90 are live on border.bot for the United States (16 lines, also used by 1 other country). Source: https://border.bot/hs-codes/293190 Last updated: 11 October 2026 [HS codes](https://border.bot/hs-codes) / [Chapter 29](https://border.bot/hs-codes/29) / [29.31](https://border.bot/hs-codes/2931) / [2931.90](https://border.bot/hs-codes/293190) ## Key facts - HS code: 2931.90 - Covers: Other organo-inorganic compounds - Heading: [29.31: Other organo-inorganic compounds](https://border.bot/hs-codes/2931) - Chapter: [29: Organic chemicals](https://border.bot/hs-codes/29) - Edition: HS2022 - Duty in the United States: [See its 16 lines](https://border.bot/countries/united-states/hs-codes/293190) ## What this code covers HS code 2931.90 covers other organo-inorganic compounds, other than those classified in 2931.10, 2931.20, 2931.41, 2931.42, 2931.43, 2931.44, 2931.45, 2931.46, 2931.47, 2931.48, 2931.49, 2931.51, 2931.52, 2931.53, 2931.54 and 2931.59. The legal text of the subheading is “Other”, in HS2022. ## What it doesn’t cover Other goods of heading 29.31 are classified under 2931.10 (tetramethyl lead and tetraethyl lead), 2931.20 (tributyltin compounds), 2931.41 (non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate), 2931.42 (non-halogenated organo-phosphorous derivatives, dimethyl propylphosphonate) or 12 others. - [2931.10](https://border.bot/hs-codes/293110) Tetramethyl lead and tetraethyl lead - [2931.20](https://border.bot/hs-codes/293120) Tributyltin compounds - [2931.41](https://border.bot/hs-codes/293141) Non-halogenated organo-phosphorous derivatives: Dimethyl methylphosphonate - [2931.42](https://border.bot/hs-codes/293142) Non-halogenated organo-phosphorous derivatives: Dimethyl propylphosphonate - [2931.43](https://border.bot/hs-codes/293143) Non-halogenated organo-phosphorous derivatives: Diethyl ethylphosphonate - [2931.44](https://border.bot/hs-codes/293144) Non-halogenated organo-phosphorous derivatives: Methylphosphonic acid - [2931.45](https://border.bot/hs-codes/293145) Non-halogenated organo-phosphorous derivatives: Salt of methylphosphonic acid and (aminoiminomethyl)urea (1: 1) - [2931.46](https://border.bot/hs-codes/293146) Non-halogenated organo-phosphorous derivatives: 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide - [2931.47](https://border.bot/hs-codes/293147) Non-halogenated organo-phosphorous derivatives: (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate - [2931.48](https://border.bot/hs-codes/293148) Non-halogenated organo-phosphorous derivatives: 3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide - [2931.49](https://border.bot/hs-codes/293149) Non-halogenated organo-phosphorous derivatives: Other - [2931.51](https://border.bot/hs-codes/293151) Halogenated organo-phosphorous derivatives: Methylphosphonic dichloride - [2931.52](https://border.bot/hs-codes/293152) Halogenated organo-phosphorous derivatives: Propylphosphonic dichloride - [2931.53](https://border.bot/hs-codes/293153) Halogenated organo-phosphorous derivatives: O-(3-chloropropyl) O-[4-nitro-3-(trifluoromethyl)phenyl] methylphosphonothionate - [2931.54](https://border.bot/hs-codes/293154) Halogenated organo-phosphorous derivatives: Trichlorfon (ISO) - [2931.59](https://border.bot/hs-codes/293159) Halogenated organo-phosphorous derivatives: Other ## How it is structured 2931.90 is a six-digit subheading. Its first two digits, 29, are the chapter; the first four, 2931, are heading 29.31; the last two, 90, identify the subheading within the heading. Countries add their own digits after these six for their national tariff lines. - Chapter 29: Organic chemicals - Heading 29.31: Other organo-inorganic compounds - Subheading 2931.90: Other ## In other countries National tariff lines under 2931.90 are live on border.bot for the United States (16 lines, also used by 1 other country). - [United States](https://border.bot/countries/united-states/hs-codes/293190): 16 lines, used by 1 other country - Previous subheading: [2931.59](https://border.bot/hs-codes/293159) Halogenated organo-phosphorous derivatives: Other - Next subheading: [2932.11](https://border.bot/hs-codes/293211) Compounds containing an unfused furan ring (whether or not hydrogenated) in the structure: Tetrahydrofuran ## Frequently asked questions ### What does HS code 2931.90 cover? HS code 2931.90 covers other organo-inorganic compounds, other than those classified in 2931.10, 2931.20, 2931.41, 2931.42, 2931.43, 2931.44, 2931.45, 2931.46, 2931.47, 2931.48, 2931.49, 2931.51, 2931.52, 2931.53, 2931.54 and 2931.59. ### Which heading and chapter is HS code 2931.90 in? HS code 2931.90 is in heading 29.31 (other organo-inorganic compounds) in chapter 29 (organic chemicals). ### Where are goods of heading 29.31 classified when 2931.90 doesn’t fit? Other goods of heading 29.31 are classified under 2931.10 (tetramethyl lead and tetraethyl lead), 2931.20 (tributyltin compounds), 2931.41 (non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate), 2931.42 (non-halogenated organo-phosphorous derivatives, dimethyl propylphosphonate) or 12 others. ### Which countries’ tariffs list national lines under HS code 2931.90? National tariff lines under 2931.90 are live on border.bot for the United States (16 lines, also used by 1 other country). ## Sources and updates The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026. This page was last updated on 11 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Machine-readable: https://border.bot/hs-codes/293190.json