HS code · 6-digit subheading

HS Code 2931.90 – Organo-inorganic compounds; other than tetramethyl lead, tetraethyl lead, tributyltin compounds, and other organo-phosphorous derivatives

HS code 2931.90 is the 6-digit subheading for organo-inorganic compounds, other than tetramethyl lead, tetraethyl lead, tributyltin compounds, and other organo-phosphorous derivatives. It is used for organosilicon compounds (unspecified), organoboron compounds (unspecified), organoaluminum compounds (unspecified), metal-organic frameworks (MOFs) and specialty catalysts.

What HS 2931.90 covers

HS code 293190 covers 'Organo-inorganic compounds; other than tetramethyl lead, tetraethyl lead, tributyltin compounds, and other organo-phosphorous derivatives'. This is a broad residual category for organometallic and other organo-inorganic compounds not specifically classified elsewhere in Chapter 29, and explicitly excludes certain lead, tin, and phosphorus compounds. These diverse compounds are crucial in advanced materials science, catalysis, electronics, and pharmaceuticals. They can include organosilicon, organoboron, organoaluminum, and various metal-organic complexes. Importers are typically high-tech manufacturers, research institutions, and specialty chemical companies. Exporters are often specialized chemical synthesis firms and major chemical producers. The trade involves high-value, low-volume products, requiring expertise in handling and application.

Covers
  • Organosilicon compounds (unspecified)
  • Organoboron compounds (unspecified)
  • Organoaluminum compounds (unspecified)
  • Metal-organic frameworks (MOFs)
  • Specialty catalysts
  • Precursors for advanced materials
Examples
  • Wacker Chemie (organosilicones)
  • BASF (catalysts)
  • Sigma-Aldrich (research chemicals)
  • Gelest (silicones)
  • Albemarle (organometallics)

Codes often confused with 2931.90

Common mistake. This code is often confused with specific organometallic compounds (e.g., 2931.10 for tetramethyl lead, 2931.30 for tributyltin compounds) if the exclusions are not carefully noted, or with other organic compounds (Chapter 29) or inorganic compounds (Chapter 28) if the 'organo-inorganic' nature is not fully understood.

2931.10Organo-inorganic compounds; tetramethyl lead and tetraethyl lead

Top exporters and importers of HS code 293190, 2025

In 2025, the largest exporter of HS code 293190 in UN Comtrade data was China, with 25% of world exports; the largest importer in UN Comtrade data was the United States, with 13% 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. 1 China $935M
  2. 2 Germany $545M
  3. 3 United States $535M

World total: $3.7B Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 United States $508M
  2. 2 China $458M
  3. 3 South Korea $308M

World total: $4.0B 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 2931.90 18

Brazil splits HS 2931.90 into 18 NCM codes, Mercosur's 8-digit tariff lines.

  1. 2931.90.2 Organosilicon compoundsCompostos organossilícicos Group
  2. 2931.90.21 Bis(trimethylsilyl)ureaBis(trimetilsilil)ureia
  3. 2931.90.29 Other organosilicon compoundsOutros
  4. 2931.90.4 Organometallic compounds of tinCompostos organometálicos do estanho Group
  5. 2931.90.41 Triphenyltin acetateAcetato de trifenilestanho
  6. 2931.90.42 TetraoctyltinTetraoctilestanho
  7. 2931.90.43 CyhexatinCiexatin
  8. 2931.90.44 Triphenyltin hydroxideHidróxido de trifenilestanho
  9. 2931.90.45 Fenbutatin oxideÓxido de fembutatina
  10. 2931.90.46 Dialkyltin (C1/C4/C8) carboxylates, thioglycolatesSais de dimetil-estanho, de dibutil-estanho e de dioctil-estanho, dos ácidos carboxílicos ou tioglicólicos e de seus ésteres
  11. 2931.90.49 Other organotin compoundsOutros
  12. 2931.90.5 Organo-arsenic compoundsCompostos organoarseniais Group
  13. 2931.90.51 Methylarsinic acid and its saltsÁcido metilarsínico e seus sais
  14. 2931.90.52 2-Chlorovinyldichloroarsine (lewisite 1)2-Clorovinil-dicloroarsina
  15. 2931.90.53 Bis(2-chlorovinyl)chloroarsine (lewisite 2)Bis(2-clorovinil)cloroarsina
  16. 2931.90.54 Tris(2-chlorovinyl)arsine (lewisite 3)Tris(2-clorovinil)arsina
  17. 2931.90.59 Other organo-arsenic compoundsOutros
  18. 2931.90.6 Organo-aluminium compoundsCompostos organoalumínicos Group
  19. 2931.90.61 Ethylaluminium sesquichlorideTricloreto de etilalumínio (sesquicloreto de etilalumínio)
  20. 2931.90.62 Diethylaluminium chlorideCloreto de dietilalumínio
  21. 2931.90.69 Other organo-aluminium compoundsOutros
  22. 2931.90.90 Other organo-inorganic compounds not specifiedOutros

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 2931.90

What is HS code 293190?

HS code 293190 is a 6-digit subheading in the Harmonized System that covers: Organo-inorganic compounds; other than tetramethyl lead, tetraethyl lead, tributyltin compounds, and other organo-phosphorous derivatives. HS code 293190 covers 'Organo-inorganic compounds; other than tetramethyl lead, tetraethyl lead, tributyltin compounds, and other organo-phosphorous derivatives'. This is a broad residual category for organometallic and other organo-inorganic compounds not specifically classified elsewhere in Chapter 29, and explicitly excludes certain lead, tin, and phosphorus compounds. These diverse compounds are crucial in advanced materials science, catalysis, electronics, and pharmaceuticals. They can include organosilicon, organoboron, organoaluminum, and various metal-organic complexes. Importers are typically high-tech manufacturers, research institutions, and specialty chemical companies. Exporters are often specialized chemical synthesis firms and major chemical producers. The trade involves high-value, low-volume products, requiring expertise in handling and application.

What products fall under HS code 293190?

Organosilicon compounds (unspecified), organoboron compounds (unspecified), organoaluminum compounds (unspecified), metal-organic frameworks (MOFs), specialty catalysts, precursors for advanced materials

What are common misclassifications for HS code 293190?

This code is often confused with specific organometallic compounds (e.g., 2931.10 for tetramethyl lead, 2931.30 for tributyltin compounds) if the exclusions are not carefully noted, or with other organic compounds (Chapter 29) or inorganic compounds (Chapter 28) if the 'organo-inorganic' nature is not fully understood.

Which countries are the top exporters of goods under HS code 293190?

In 2025, the top exporters of HS code 293190 in UN Comtrade data were China ($935M, 25% of world exports), Germany ($545M) and the United States ($535M). World exports came to about $3.7B, 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 293190?

In 2025, the top importers of HS code 293190 in UN Comtrade data were the United States ($508M, 13% of world imports), China ($458M) and South Korea ($308M). World imports came to about $4.0B, 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 293190 structured?

HS code 293190 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 (90) specify the subheading. This code is standardized globally by the World Customs Organization.

What is the Brazil NCM code for HS code 293190?

Brazil splits HS code 293190 into 18 NCM codes: 2931.90.21 (Bis(trimethylsilyl)urea), 2931.90.29 (Other organosilicon compounds), 2931.90.41 (Triphenyltin acetate), 2931.90.42 (Tetraoctyltin), 2931.90.43 (Cyhexatin), 2931.90.44 (Triphenyltin hydroxide), 2931.90.45 (Fenbutatin oxide), 2931.90.46 (Dialkyltin (C1/C4/C8) carboxylates, thioglycolates), and more listed on this page. The first 6 digits of each match the HS code.