# HS code 2931.41: Non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate > HS code 2931.41 covers non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate. 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), 2931.42 (non-halogenated organo-phosphorous derivatives, dimethyl propylphosphonate), 2931.43 (non-halogenated organo-phosphorous derivatives, diethyl ethylphosphonate) or 12 others. National tariff lines under 2931.41 are live on border.bot for the United States (1 line, also used by 1 other country). Source: https://border.bot/hs-codes/293141 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) / [2931.41](https://border.bot/hs-codes/293141) ## Key facts - HS code: 2931.41 - Covers: Non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate - 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 1 line](https://border.bot/countries/united-states/hs-codes/293141) ## What this code covers HS code 2931.41 covers non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate. The legal text of the subheading is “Non-halogenated organo-phosphorous derivatives: Dimethyl methylphosphonate”, read under “Non-halogenated organo-phosphorous derivatives”, 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), 2931.42 (non-halogenated organo-phosphorous derivatives, dimethyl propylphosphonate), 2931.43 (non-halogenated organo-phosphorous derivatives, diethyl ethylphosphonate) 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 - [2931.42](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 - [2931.90](https://border.bot/hs-codes/293190) Other ## How it is structured 2931.41 is a six-digit subheading. Its first two digits, 29, are the chapter; the first four, 2931, are heading 29.31; the last two, 41, 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 - Within the heading: Non-halogenated organo-phosphorous derivatives - Subheading 2931.41: Dimethyl methylphosphonate ## In other countries National tariff lines under 2931.41 are live on border.bot for the United States (1 line, also used by 1 other country). - [United States](https://border.bot/countries/united-states/hs-codes/293141): 1 line, used by 1 other country - Previous subheading: [2931.20](https://border.bot/hs-codes/293120) Tributyltin compounds - Next subheading: [2931.42](https://border.bot/hs-codes/293142) Non-halogenated organo-phosphorous derivatives: Dimethyl propylphosphonate ## Frequently asked questions ### What does HS code 2931.41 cover? HS code 2931.41 covers non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate. ### Which heading and chapter is HS code 2931.41 in? HS code 2931.41 is in heading 29.31 (other organo-inorganic compounds) in chapter 29 (organic chemicals). ### Where are goods of heading 29.31 classified when 2931.41 doesn’t fit? Other goods of heading 29.31 are classified under 2931.10 (tetramethyl lead and tetraethyl lead), 2931.20 (tributyltin compounds), 2931.42 (non-halogenated organo-phosphorous derivatives, dimethyl propylphosphonate), 2931.43 (non-halogenated organo-phosphorous derivatives, diethyl ethylphosphonate) or 12 others. ### Which countries’ tariffs list national lines under HS code 2931.41? National tariff lines under 2931.41 are live on border.bot for the United States (1 line, 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/293141.json