HS code · 6-digit subheading

HS Code 2921.51 – Amine-function compounds; aromatic amines and their derivatives; o-, m-, p-phenylenediamine, diaminotoluenes and their derivatives; salts thereof

HS code 2921.51 is the 6-digit subheading for amine-function compounds, aromatic amines and their derivatives, o-, m-, p-phenylenediamine, diaminotoluenes and their derivatives, salts thereof. It is used for p-Phenylenediamine, m-Phenylenediamine, o-Phenylenediamine, toluene-2,4-diamine and toluene-2,6-diamine.

What HS 2921.51 covers

This HS code covers specific aromatic polyamines: o-, m-, p-phenylenediamine, diaminotoluenes, and their derivatives, including their salts. These compounds are critical building blocks for a wide range of industrial products. Phenylenediamines are essential for hair colorants, aramid fibers (like Kevlar), and rubber chemicals, while diaminotoluenes are key precursors for toluene diisocyanate (TDI), a major component in polyurethane foams. Their distinct isomeric forms offer different properties and applications. Trade is significant, with major chemical producers supplying to industries like automotive, textiles, and cosmetics. Importers are typically manufacturers of polymers, dyes, and personal care products, seeking high-purity intermediates.

Covers
  • P-Phenylenediamine
  • M-Phenylenediamine
  • O-Phenylenediamine
  • Toluene-2,4-diamine
  • Toluene-2,6-diamine
  • N,N'-diphenyl-p-phenylenediamine
  • 4-chloro-o-phenylenediamine
Examples
  • DuPont (Kevlar uses p-phenylenediamine)
  • Covestro (TDI uses diaminotoluenes)
  • L'Oréal (hair dyes use phenylenediamines)
  • Lanxess (rubber chemicals)
  • BASF (intermediates)

Codes often confused with 2921.51

Common mistake. Can be confused with other aromatic polyamines (292159) if the specific phenylenediamine or diaminotoluene structure is not identified, or even with aromatic monoamines (292149) if the 'polyamine' aspect is missed.

2921.59Amine-function compounds; aromatic polyamines and their derivatives, other than item no. 2921.512921.49Amine-function compounds; aromatic monoamines and their derivatives; salts thereof; n.e.c. in item no. 2921.4

Top exporters and importers of HS code 292151, 2025

In 2025, the largest exporter of HS code 292151 in UN Comtrade data was China, with 45% of world exports; the largest importer in UN Comtrade data was the United States, with 14% 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 $366M
  2. 2 Belgium $135M
  3. 3 South Korea $80M

World total: $820M Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 United States $121M
  2. 2 Pakistan $69M
  3. 3 Germany $61M

World total: $864M 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 2921.51 11

Brazil splits HS 2921.51 into 11 NCM codes, Mercosur's 8-digit tariff lines.

  1. 2921.51.1 o-, m-, p-Phenylenediamine; diaminotoluenes; salts thereofo-, m-, p-Fenilenodiamina; diaminotoluenos; sais destes produtos Group
  2. 2921.51.11 m-Phenylenediamine and its saltsm-Fenilenodiamina e seus sais
  3. 2921.51.12 Diaminotoluenes (toluylenediamines)Diaminotoluenos (toluilenodiaminas)
  4. 2921.51.19 Other phenylenediamines, diaminotoluenes and saltsOutros
  5. 2921.51.20 Sulphonated phenylenediamine derivatives; saltsDerivados sulfonados das fenilenodiaminas e de seus derivados; sais destes produtos
  6. 2921.51.3 Other derivatives of phenylenediamines; salts thereofOutros derivados das fenilenodiaminas; sais destes produtos Group
  7. 2921.51.31 N,N'-Di-sec-butyl-p-phenylenediamineN,N'-Di-sec-butil-p-fenilenodiamina
  8. 2921.51.32 N-Isopropyl-N'-phenyl-p-phenylenediamine (IPPD)N-Isopropil-N'-fenil-p-fenilenodiamina
  9. 2921.51.33 N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamineN-(1,3-Dimetilbutil)-N'-fenil-p-fenilenodiamina
  10. 2921.51.34 4-(1,4-Dimethylpentylamino)diphenylamine (7PPD)N-(1,4-Dimetilpentil)-N'-fenil-p-fenilenodiamina
  11. 2921.51.35 N-Phenyl-p-phenylenediamine and its saltsN-Fenil-p-fenilenodiamina (4-aminodifenilamina) e seus sais
  12. 2921.51.39 Other phenylenediamine derivatives and saltsOutros
  13. 2921.51.90 Other diaminotoluene derivatives and their saltsOutros

All Brazil NCM codes in heading 29.21 →

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.

Questions about HS 2921.51

What is HS code 292151?

HS code 292151 is a 6-digit subheading in the Harmonized System that covers: Amine-function compounds; aromatic amines and their derivatives; o-, m-, p-phenylenediamine, diaminotoluenes and their derivatives; salts thereof. This HS code covers specific aromatic polyamines: o-, m-, p-phenylenediamine, diaminotoluenes, and their derivatives, including their salts. These compounds are critical building blocks for a wide range of industrial products. Phenylenediamines are essential for hair colorants, aramid fibers (like Kevlar), and rubber chemicals, while diaminotoluenes are key precursors for toluene diisocyanate (TDI), a major component in polyurethane foams. Their distinct isomeric forms offer different properties and applications. Trade is significant, with major chemical producers supplying to industries like automotive, textiles, and cosmetics. Importers are typically manufacturers of polymers, dyes, and personal care products, seeking high-purity intermediates.

What products fall under HS code 292151?

p-Phenylenediamine, m-Phenylenediamine, o-Phenylenediamine, Toluene-2,4-diamine, Toluene-2,6-diamine, N,N'-diphenyl-p-phenylenediamine, 4-chloro-o-phenylenediamine

What are common misclassifications for HS code 292151?

Can be confused with other aromatic polyamines (292159) if the specific phenylenediamine or diaminotoluene structure is not identified, or even with aromatic monoamines (292149) if the 'polyamine' aspect is missed.

Which countries are the top exporters of goods under HS code 292151?

In 2025, the top exporters of HS code 292151 in UN Comtrade data were China ($366M, 45% of world exports), Belgium ($135M) and South Korea ($80M). World exports came to about $820M, 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 292151?

In 2025, the top importers of HS code 292151 in UN Comtrade data were the United States ($121M, 14% of world imports), Pakistan ($69M) and Germany ($61M). World imports came to about $864M, 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 292151 structured?

HS code 292151 is a 6-digit subheading under the Harmonized System. The first 2 digits (29) identify the chapter, digits 3-4 (21) identify the heading, and digits 5-6 (51) specify the subheading. This code is standardized globally by the World Customs Organization.

What is the Brazil NCM code for HS code 292151?

Brazil splits HS code 292151 into 11 NCM codes: 2921.51.11 (m-Phenylenediamine and its salts), 2921.51.12 (Diaminotoluenes (toluylenediamines)), 2921.51.19 (Other phenylenediamines, diaminotoluenes and salts), 2921.51.20 (Sulphonated phenylenediamine derivatives; salts), 2921.51.31 (N,N'-Di-sec-butyl-p-phenylenediamine), 2921.51.32 (N-Isopropyl-N'-phenyl-p-phenylenediamine (IPPD)), 2921.51.33 (N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine), 2921.51.34 (4-(1,4-Dimethylpentylamino)diphenylamine (7PPD)), and more listed on this page. The first 6 digits of each match the HS code.