HS code 2931.44: Non-halogenated organo-phosphorous derivatives, methylphosphonic acid
Last updated
Key facts
- HS code
- 2931.44
- Covers
- Non-halogenated organo-phosphorous derivatives, methylphosphonic acid
- Chapter
- 29: Organic chemicals
- Edition
- HS2022
- Duty in the United States
- See its 1 line
Summary
HS code 2931.44 covers non-halogenated organo-phosphorous derivatives, methylphosphonic acid. 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 2931.44 are live on border.bot for the United States (1 line, also used by 1 other country).
What this code covers
HS code 2931.44 covers non-halogenated organo-phosphorous derivatives, methylphosphonic acid.
The legal text of the subheading is “Non-halogenated organo-phosphorous derivatives: Methylphosphonic acid”, 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), 2931.41 (non-halogenated organo-phosphorous derivatives, dimethyl methylphosphonate), 2931.42 (non-halogenated organo-phosphorous derivatives, dimethyl propylphosphonate) or 12 others.
- 2931.10Tetramethyl lead and tetraethyl lead
- 2931.20Tributyltin compounds
- 2931.41Non-halogenated organo-phosphorous derivatives: Dimethyl methylphosphonate
- 2931.42Non-halogenated organo-phosphorous derivatives: Dimethyl propylphosphonate
- 2931.43Non-halogenated organo-phosphorous derivatives: Diethyl ethylphosphonate
- 2931.45Non-halogenated organo-phosphorous derivatives: Salt of methylphosphonic acid and (aminoiminomethyl)urea (1: 1)
- 2931.46Non-halogenated organo-phosphorous derivatives: 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide
- 2931.47Non-halogenated organo-phosphorous derivatives: (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate
- 2931.48Non-halogenated organo-phosphorous derivatives: 3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide
- 2931.49Non-halogenated organo-phosphorous derivatives: Other
- 2931.51Halogenated organo-phosphorous derivatives: Methylphosphonic dichloride
- 2931.52Halogenated organo-phosphorous derivatives: Propylphosphonic dichloride
- 2931.53Halogenated organo-phosphorous derivatives: O-(3-chloropropyl) O-[4-nitro-3-(trifluoromethyl)phenyl] methylphosphonothionate
- 2931.54Halogenated organo-phosphorous derivatives: Trichlorfon (ISO)
- 2931.59Halogenated organo-phosphorous derivatives: Other
- 2931.90Other
How it is structured
2931.44 is a six-digit subheading. Its first two digits, 29, are the chapter; the first four, 2931, are heading 29.31; the last two, 44, 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 2931.44
- Methylphosphonic acid
In other countries
National tariff lines under 2931.44 are live on border.bot for the United States (1 line, also used by 1 other country).
- United States1 line, used by 1 other country
Frequently asked questions
What does HS code 2931.44 cover?
HS code 2931.44 covers non-halogenated organo-phosphorous derivatives, methylphosphonic acid.
Which heading and chapter is HS code 2931.44 in?
HS code 2931.44 is in heading 29.31 (other organo-inorganic compounds) in chapter 29 (organic chemicals).
Where are goods of heading 29.31 classified when 2931.44 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 2931.44?
National tariff lines under 2931.44 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.