# United States tariff lines under HS 2921.59

> The United States tariff splits HS 2921.59 (aromatic polyamines and their derivatives; salts thereof: Other) into 8 national lines: 2921.59.04.00 (1,8-Diaminonaphthalene (1,8-Naphthalenediamine)), 2921.59.08.00 (5-Amino-2-(p-aminoanilino) benzenesulfonic acid; 4,4'-Diamino-3-biphenylsulfonic acid (3-Benzidinesulfonic acid); 3,3'-Dimethylbenzidine (o-Tolidine); 3,3'-Dimethylbenzidine hydrochloride; Ethyl-(2-dimethylaminoethyl) aniline;N-Ethyl-N,N'-dimethyl-N'-phenylethylene- diamine; and 4,4'-Methylenebis(2-chloroaniline)), 2921.59.17.00 (4,4'-Benzidine-2,2'-disulfonic acid; 1,4-Diaminobenzene-2-sulfonic acid; 4,4'-Methylene bis ((3-chloro-2,6-diethylaniline); 4,4'-Methylene bis(2,6-diethylaniline); 4,4'-Methylene bis (2,6-diisopropylaniline);m-Xylene diamine; and 3,3'-Diaminobenzidine (tetraaminobiphenyl)), 2921.59.20.00 (4,4'-Diamino-2,2'-stilbenedisulfonic acid) and 4 others. The general (MFN) duty differs by line: free on 2921.59.04.00, 5.8% on 2921.59.08.00, free on 2921.59.17.00, 6.5% on 2921.59.20.00, 6.5% on 2921.59.30.00, 6.5% on 2921.59.40.00, 6.5% on 2921.59.80.10 and 6.5% on 2921.59.80.90.

Source: https://border.bot/countries/united-states/hs-codes/292159
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2921.59](https://border.bot/countries/united-states/hs-codes/292159)

## Key facts

- HS subheading: [2921.59](https://border.bot/hs-codes/292159)
- National lines: 8
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 29: Organic chemicals

## United States lines under 2921.59

The United States tariff splits HS 2921.59 (aromatic polyamines and their derivatives; salts thereof: Other) into 8 national lines: 2921.59.04.00 (1,8-Diaminonaphthalene (1,8-Naphthalenediamine)), 2921.59.08.00 (5-Amino-2-(p-aminoanilino) benzenesulfonic acid; 4,4'-Diamino-3-biphenylsulfonic acid (3-Benzidinesulfonic acid); 3,3'-Dimethylbenzidine (o-Tolidine); 3,3'-Dimethylbenzidine hydrochloride; Ethyl-(2-dimethylaminoethyl) aniline;N-Ethyl-N,N'-dimethyl-N'-phenylethylene- diamine; and 4,4'-Methylenebis(2-chloroaniline)), 2921.59.17.00 (4,4'-Benzidine-2,2'-disulfonic acid; 1,4-Diaminobenzene-2-sulfonic acid; 4,4'-Methylene bis ((3-chloro-2,6-diethylaniline); 4,4'-Methylene bis(2,6-diethylaniline); 4,4'-Methylene bis (2,6-diisopropylaniline);m-Xylene diamine; and 3,3'-Diaminobenzidine (tetraaminobiphenyl)), 2921.59.20.00 (4,4'-Diamino-2,2'-stilbenedisulfonic acid) and 4 others.

The general (MFN) duty differs by line: free on 2921.59.04.00, 5.8% on 2921.59.08.00, free on 2921.59.17.00, 6.5% on 2921.59.20.00, 6.5% on 2921.59.30.00, 6.5% on 2921.59.40.00, 6.5% on 2921.59.80.10 and 6.5% on 2921.59.80.90.

- [2921.59.04.00](https://border.bot/countries/united-states/hs-codes/2921590400) Aromatic polyamines and their derivatives; salts thereof, Other, 1,8-Diaminonaphthalene (1,8-Naphthalenediamine). Duty (MFN): free
- [2921.59.08.00](https://border.bot/countries/united-states/hs-codes/2921590800) Aromatic polyamines and their derivatives; salts thereof, Other, 5-Amino-2-(p-aminoanilino) benzenesulfonic acid; 4,4'-Diamino-3-biphenylsulfonic acid (3-Benzidinesulfonic acid); 3,3'-Dimethylbenzidine (o-Tolidine); 3,3'-Dimethylbenzidine hydrochloride; Ethyl-(2-dimethylaminoethyl) aniline;N-Ethyl-N,N'-dimethyl-N'-phenylethylene- diamine; and 4,4'-Methylenebis(2-chloroaniline). Duty (MFN): 5.8%
- [2921.59.17.00](https://border.bot/countries/united-states/hs-codes/2921591700) Aromatic polyamines and their derivatives; salts thereof, Other, 4,4'-Benzidine-2,2'-disulfonic acid; 1,4-Diaminobenzene-2-sulfonic acid; 4,4'-Methylene bis ((3-chloro-2,6-diethylaniline); 4,4'-Methylene bis(2,6-diethylaniline); 4,4'-Methylene bis (2,6-diisopropylaniline);m-Xylene diamine; and 3,3'-Diaminobenzidine (tetraaminobiphenyl). Duty (MFN): free
- [2921.59.20.00](https://border.bot/countries/united-states/hs-codes/2921592000) Aromatic polyamines and their derivatives; salts thereof, Other, 4,4'-Diamino-2,2'-stilbenedisulfonic acid. Duty (MFN): 6.5%
- [2921.59.30.00](https://border.bot/countries/united-states/hs-codes/2921593000) Aromatic polyamines and their derivatives; salts thereof, Other, 4,4'-Methylenedianiline. Duty (MFN): 6.5%
- [2921.59.40.00](https://border.bot/countries/united-states/hs-codes/2921594000) Aromatic polyamines and their derivatives; salts thereof, Other, Other, Products described in additional U.S. note 3 to section VI. Duty (MFN): 6.5%
- [2921.59.80.10](https://border.bot/countries/united-states/hs-codes/2921598010) Aromatic polyamines and their derivatives; salts thereof, Other, Other, Other, 3,3'-Dichlorobenzidine dihydrochloride. Duty (MFN): 6.5%
- [2921.59.80.90](https://border.bot/countries/united-states/hs-codes/2921598090) Aromatic polyamines and their derivatives; salts thereof, Other, Other, Other, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 2921.59 yet.

- [The Harmonized System text for 2921.59](https://border.bot/hs-codes/292159)

- Previous subheading: [2921.51](https://border.bot/countries/united-states/hs-codes/292151) o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof
- Next subheading: [2922.11](https://border.bot/countries/united-states/hs-codes/292211) Oxygen-function amino-compounds

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2921.59?

The United States tariff splits HS 2921.59 (aromatic polyamines and their derivatives; salts thereof: Other) into 8 national lines: 2921.59.04.00 (1,8-Diaminonaphthalene (1,8-Naphthalenediamine)), 2921.59.08.00 (5-Amino-2-(p-aminoanilino) benzenesulfonic acid; 4,4'-Diamino-3-biphenylsulfonic acid (3-Benzidinesulfonic acid); 3,3'-Dimethylbenzidine (o-Tolidine); 3,3'-Dimethylbenzidine hydrochloride; Ethyl-(2-dimethylaminoethyl) aniline;N-Ethyl-N,N'-dimethyl-N'-phenylethylene- diamine; and 4,4'-Methylenebis(2-chloroaniline)), 2921.59.17.00 (4,4'-Benzidine-2,2'-disulfonic acid; 1,4-Diaminobenzene-2-sulfonic acid; 4,4'-Methylene bis ((3-chloro-2,6-diethylaniline); 4,4'-Methylene bis(2,6-diethylaniline); 4,4'-Methylene bis (2,6-diisopropylaniline);m-Xylene diamine; and 3,3'-Diaminobenzidine (tetraaminobiphenyl)), 2921.59.20.00 (4,4'-Diamino-2,2'-stilbenedisulfonic acid) and 4 others.

### What is the duty on HS 2921.59 in the United States?

The general (MFN) duty differs by line: free on 2921.59.04.00, 5.8% on 2921.59.08.00, free on 2921.59.17.00, 6.5% on 2921.59.20.00, 6.5% on 2921.59.30.00, 6.5% on 2921.59.40.00, 6.5% on 2921.59.80.10 and 6.5% on 2921.59.80.90.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 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.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/292159.json