HS code · 6-digit subheading
HS Code 2931.44 – Non-halogenated organo-phosphorous derivatives; methylphosphonic acid
HS code 2931.44 is the 6-digit subheading for non-halogenated organo-phosphorous derivatives, methylphosphonic acid. It is used for methylphosphonic acid, MPA, methanephosphonic acid and methylphosphonic acid monohydrate.
What HS 2931.44 covers
This HS code covers methylphosphonic acid, a fundamental non-halogenated organo-phosphorous compound. It is predominantly used as an intermediate in the production of various specialty chemicals, including flame retardants, chelating agents, and corrosion inhibitors. Chemical manufacturers and companies involved in polymer additives or water treatment are the primary traders of this acid. Its strong acidic nature and ability to form stable complexes are key to its industrial utility, making it a valuable building block for advanced material science and chemical synthesis.
- Covers
- Methylphosphonic acid
- MPA
- Methanephosphonic acid
- Methylphosphonic acid monohydrate
- Examples
- Lanxess
- Solvay
- Sigma-Aldrich (now Merck KGaA)
- ICL Group
Codes often confused with 2931.44
Common mistake. Can be confused with other phosphonic acids (e.g., 2931.90 for 'other' organo-phosphorous compounds) or even inorganic phosphorous acids (Chapter 28) due to its acidic nature.
Top exporters and importers of HS code 293144, 2025
In 2025, the largest exporter of HS code 293144 in UN Comtrade data was the United States, with 41% of world exports; the largest importer in UN Comtrade data was Switzerland, with 34% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 United States $557K 41% of world exports
- 2 Germany $429K 31% of world exports
- 3 India $222K 16% of world exports
World total: $1.4M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Switzerland $1.2M 34% of world imports
- 2 Canada $497K 14% of world imports
- 3 Chile $348K 10% of world imports
World total: $3.4M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for 2931.44
Brazil does not split HS 2931.44: its NCM code is 2931.44.00.
All Brazil NCM codes in heading 29.31 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2931.44
What is HS code 293144?
HS code 293144 is a 6-digit subheading in the Harmonized System that covers: Non-halogenated organo-phosphorous derivatives; methylphosphonic acid. This HS code covers methylphosphonic acid, a fundamental non-halogenated organo-phosphorous compound. It is predominantly used as an intermediate in the production of various specialty chemicals, including flame retardants, chelating agents, and corrosion inhibitors. Chemical manufacturers and companies involved in polymer additives or water treatment are the primary traders of this acid. Its strong acidic nature and ability to form stable complexes are key to its industrial utility, making it a valuable building block for advanced material science and chemical synthesis.
What products fall under HS code 293144?
Methylphosphonic acid, MPA, Methanephosphonic acid, Methylphosphonic acid monohydrate
What are common misclassifications for HS code 293144?
Can be confused with other phosphonic acids (e.g., 2931.90 for 'other' organo-phosphorous compounds) or even inorganic phosphorous acids (Chapter 28) due to its acidic nature.
Which countries are the top exporters of goods under HS code 293144?
In 2025, the top exporters of HS code 293144 in UN Comtrade data were the United States ($557K, 41% of world exports), Germany ($429K) and India ($222K). World exports came to about $1.4M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 293144?
In 2025, the top importers of HS code 293144 in UN Comtrade data were Switzerland ($1.2M, 34% of world imports), Canada ($497K) and Chile ($348K). World imports came to about $3.4M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 293144 structured?
HS code 293144 is a 6-digit subheading under the Harmonized System. The first 2 digits (29) identify the chapter, digits 3-4 (31) identify the heading, and digits 5-6 (44) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293144?
In Brazil, HS code 293144 is NCM 2931.44.00. The last two digits are 00 because Brazil does not split this HS code further.