HS code · 6-digit subheading
HS Code 2931.59 – Halogenated organo-phosphorous derivatives; other halogenated organo-phosphorous derivatives, n.e.c. in item no. 2931.5
HS code 2931.59 is the 6-digit subheading for halogenated organo-phosphorous derivatives, other halogenated organo-phosphorous derivatives, n.e.c. in item no. 2931.5. It is used for halogenated phosphonate esters, brominated organophosphorus flame retardants, chlorinated organophosphorus plasticizers, specialty agrochemical intermediates and novel halogenated phosphine oxides.
What HS 2931.59 covers
HS code 293159 is the 'basket' category for 'other halogenated organo-phosphorous derivatives, n.e.c. in item no. 2931.5'. This code encompasses a broad spectrum of halogenated organo-phosphorous compounds that do not have specific classifications within the 2931.5 series. These chemicals are vital as intermediates in the synthesis of various products, including flame retardants, plasticizers, specialty polymers, and agrochemicals. The continuous development of new compounds means this category is dynamic, accommodating novel substances until they gain specific classification. Importers and exporters are typically chemical distributors, manufacturers of specialty chemicals, and R&D-focused companies. Trade requires precise chemical identification, safety data sheets, and compliance with relevant chemical regulations.
- Covers
- Halogenated phosphonate esters
- Brominated organophosphorus flame retardants
- Chlorinated organophosphorus plasticizers
- Specialty agrochemical intermediates
- Novel halogenated phosphine oxides
- Examples
- Sigma-Aldrich (research chemicals)
- TCI Chemicals
- Alfa Aesar
- various generic chemical suppliers
- custom synthesis houses
Codes often confused with 2931.59
Common mistake. This code is frequently confused with more specific halogenated organo-phosphorous derivatives (e.g., 2931.51-2931.54) if a precise classification exists, or with other halogenated organic compounds in Chapter 29 if the organo-phosphorus nature is not fully recognized.
Top exporters and importers of HS code 293159, 2025
In 2025, the largest exporter of HS code 293159 in UN Comtrade data was China, with 52% of world exports; the largest importer in UN Comtrade data was Brazil, with 32% 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 China $27M 52% of world exports
- 2 United States $15M 28% of world exports
- 3 Germany $2.4M 4.5% of world exports
World total: $53M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Brazil $32M 32% of world imports
- 2 United States $14M 14% of world imports
- 3 Indonesia $9.0M 9.0% of world imports
World total: $100M 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 codes for 2931.59 11
Brazil splits HS 2931.59 into 11 NCM codes, Mercosur's 8-digit tariff lines.
- 2931.59.1 Clodronic acid and its disodium salt; ethephon; fotemustineÁcido clodrônico e seu sal dissódico; etefon; fotemustina Group
- 2931.59.11 Clodronic acid and its disodium saltÁcido clodrônico e seu sal dissódico
- 2931.59.12 EthephonEtefon
- 2931.59.13 FotemustineFotemustina
- 2931.59.9 OtherOutros Group
- 2931.59.91 O-Alkyl(≤C10) alkyl(C1-C3)phosphonofluoridatesAlquil(de C1 a C3)fosfonofluoridatos de O-alquila (de até C10, incluindo os cicloalquila)
- 2931.59.92 O-Isopropyl methylphosphonochloridateMetilfosfonocloridato de O-isopropila
- 2931.59.93 O-Pinacolyl methylphosphonochloridateMetilfosfonocloridato de O-pinacolila
- 2931.59.94 Alkyl(C1-C3)phosphonyl difluoridesDifluoreto de alquilfosfonila, com grupo alquila de C1 a C3
- 2931.59.95 Dialkylaminoalkylidene phosphonamidofluoridatesFosfonamidofluoridatos de P-alquila (de até C10, incluindo cicloalquila) N-(1-(dialquila (de até C10, incluindo cicloalquila)amino))alquilideno (H ou de até C10, incluindo cicloalquila) e sais alquilados ou protonados destes produtos
- 2931.59.96 Bis(diethylamino)methylene phosphonamidofluoridate(Bis(dietilamina)metileno)fosfonamidofluoridato de metila
- 2931.59.98 Halogenated P-(C1-C3)alkyl, no other P-C bondOutros compostos que contenham um átomo de fósforo ligado a um grupo alquila (de C1 a C3) mas sem outros átomos de carbono
- 2931.59.99 Other halogenated organophosphorus derivativesOutros
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 2931.59
What is HS code 293159?
HS code 293159 is a 6-digit subheading in the Harmonized System that covers: Halogenated organo-phosphorous derivatives; other halogenated organo-phosphorous derivatives, n.e.c. in item no. 2931.5. HS code 293159 is the 'basket' category for 'other halogenated organo-phosphorous derivatives, n.e.c. in item no. 2931.5'. This code encompasses a broad spectrum of halogenated organo-phosphorous compounds that do not have specific classifications within the 2931.5 series. These chemicals are vital as intermediates in the synthesis of various products, including flame retardants, plasticizers, specialty polymers, and agrochemicals. The continuous development of new compounds means this category is dynamic, accommodating novel substances until they gain specific classification. Importers and exporters are typically chemical distributors, manufacturers of specialty chemicals, and R&D-focused companies. Trade requires precise chemical identification, safety data sheets, and compliance with relevant chemical regulations.
What products fall under HS code 293159?
Halogenated phosphonate esters, brominated organophosphorus flame retardants, chlorinated organophosphorus plasticizers, specialty agrochemical intermediates, novel halogenated phosphine oxides
What are common misclassifications for HS code 293159?
This code is frequently confused with more specific halogenated organo-phosphorous derivatives (e.g., 2931.51-2931.54) if a precise classification exists, or with other halogenated organic compounds in Chapter 29 if the organo-phosphorus nature is not fully recognized.
Which countries are the top exporters of goods under HS code 293159?
In 2025, the top exporters of HS code 293159 in UN Comtrade data were China ($27M, 52% of world exports), the United States ($15M) and Germany ($2.4M). World exports came to about $53M, 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 293159?
In 2025, the top importers of HS code 293159 in UN Comtrade data were Brazil ($32M, 32% of world imports), the United States ($14M) and Indonesia ($9.0M). World imports came to about $100M, 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 293159 structured?
HS code 293159 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 (59) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293159?
Brazil splits HS code 293159 into 11 NCM codes: 2931.59.11 (Clodronic acid and its disodium salt), 2931.59.12 (Ethephon), 2931.59.13 (Fotemustine), 2931.59.91 (O-Alkyl(≤C10) alkyl(C1-C3)phosphonofluoridates), 2931.59.92 (O-Isopropyl methylphosphonochloridate), 2931.59.93 (O-Pinacolyl methylphosphonochloridate), 2931.59.94 (Alkyl(C1-C3)phosphonyl difluorides), 2931.59.95 (Dialkylaminoalkylidene phosphonamidofluoridates), and more listed on this page. The first 6 digits of each match the HS code.