# United States tariff line 2921.45.25.00: Mixtures of 5- and 8-amino-2-naphthalene- sulfonic acid; 2-Naphthylamine-6-sulfonic acid; ando-Naphthionic acid (1-amino- 2-naphthalene- sulfonic acid)

> In the United States tariff, line 2921.45.25.00 covers aromatic monoamines and their derivatives; salts thereof, 1-Naphthylamine (α-Naphthylamine), 2-Naphthylamine (β-Naphthylamine), and their derivatives; salts thereof, mixtures of 5- and 8-amino-2-naphthalene- sulfonic acid; 2-Naphthylamine-6-sulfonic acid; ando-Naphthionic acid (1-amino- 2-naphthalene- sulfonic acid). Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2921.45 in heading 29.21 (chapter 29).

Source: https://border.bot/countries/united-states/hs-codes/2921452500
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) / [2921.45](https://border.bot/countries/united-states/hs-codes/292145) / [2921.45.25.00](https://border.bot/countries/united-states/hs-codes/2921452500)

## Key facts

- Tariff line: 2921.45.25.00
- Covers: Aromatic monoamines and their derivatives; salts thereof, 1-Naphthylamine (α-Naphthylamine), 2-Naphthylamine (β-Naphthylamine), and their derivatives; salts thereof, mixtures of 5- and 8-amino-2-naphthalene- sulfonic acid; 2-Naphthylamine-6-sulfonic acid; ando-Naphthionic acid (1-amino- 2-naphthalene- sulfonic acid)
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2921.45](https://border.bot/hs-codes/292145)

## What this line covers

In the United States tariff, line 2921.45.25.00 covers aromatic monoamines and their derivatives; salts thereof, 1-Naphthylamine (α-Naphthylamine), 2-Naphthylamine (β-Naphthylamine), and their derivatives; salts thereof, mixtures of 5- and 8-amino-2-naphthalene- sulfonic acid; 2-Naphthylamine-6-sulfonic acid; ando-Naphthionic acid (1-amino- 2-naphthalene- sulfonic acid).

Its legal text is “Mixtures of 5- and 8-amino-2-naphthalene- sulfonic acid; 2-Naphthylamine-6-sulfonic acid; ando-Naphthionic acid (1-amino- 2-naphthalene- sulfonic acid)”, read under “Aromatic monoamines and their derivatives; salts thereof” and “1-Naphthylamine (α-Naphthylamine), 2-Naphthylamine (β-Naphthylamine), and their derivatives; salts thereof”.

## How it is structured

It falls under HS subheading 2921.45 in heading 29.21 (chapter 29). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 29: Organic chemicals
- Heading 29.21: Amine-function compounds
- Subheading 2921.45: Aromatic monoamines and their derivatives; salts thereof
- Within the subheading: 1-Naphthylamine (α-Naphthylamine), 2-Naphthylamine (β-Naphthylamine), and their derivatives; salts thereof
- Line 2921.45.25.00: Mixtures of 5- and 8-amino-2-naphthalene- sulfonic acid; 2-Naphthylamine-6-sulfonic acid; ando-Naphthionic acid (1-amino- 2-naphthalene- sulfonic acid)

## Duty

Goods under this line enter free of general (MFN) duty.

## In other countries

No other national tariff on border.bot has live lines under 2921.45 yet.

- [The Harmonized System text for 2921.45](https://border.bot/hs-codes/292145)

## Other lines under 2921.45

- [2921.45.10.00](https://border.bot/countries/united-states/hs-codes/2921451000) 7-Amino-1,3-naphthalenedisulfonic acid and its salts; 5-Amino-2-naphthalenesulfonic acid and its salts; 8-Amino-1-naphthalenesulfonic acid and its salts; andN-Phenyl-2-naphthylamine
- [2921.45.20.00](https://border.bot/countries/united-states/hs-codes/2921452000) 3-Amino-2,7-naphthalenedisulfonic acid; 4-Amino-1-naphthalenesulfonic acid, sodium salt; 5-Amino-1-naphthalenesulfonic acid (Laurent's acid); 8-Amino-2-naphthalenesulfonic acid and its salts; 7-Amino-1,3,6-naphthalenetrisulfonic acid; 8-Anilino-1-naphthalenesulfonic acid (Phenyl Peri acid) and its salts; andN-Ethyl-1-naphthylamine
- [2921.45.60.00](https://border.bot/countries/united-states/hs-codes/2921456000) Products described in additional U.S. note 3 to section VI
- [2921.45.90.10](https://border.bot/countries/united-states/hs-codes/2921459010) 2-Amino-1-naphthalenesulfonic acid (Tobias acid)
- [2921.45.90.90](https://border.bot/countries/united-states/hs-codes/2921459090) Other

- Previous line: [2921.45.20.00](https://border.bot/countries/united-states/hs-codes/2921452000) 3-Amino-2,7-naphthalenedisulfonic acid; 4-Amino-1-naphthalenesulfonic acid, sodium salt; 5-Amino-1-naphthalenesulfonic acid (Laurent's acid); 8-Amino-2-naphthalenesulfonic acid and its salts; 7-Amino-1,3,6-naphthalenetrisulfonic acid; 8-Anilino-1-naphthalenesulfonic acid (Phenyl Peri acid) and its salts; andN-Ethyl-1-naphthylamine
- Next line: [2921.45.60.00](https://border.bot/countries/united-states/hs-codes/2921456000) Products described in additional U.S. note 3 to section VI

## Frequently asked questions

### What does tariff line 2921.45.25.00 cover in the United States tariff?

In the United States tariff, line 2921.45.25.00 covers aromatic monoamines and their derivatives; salts thereof, 1-Naphthylamine (α-Naphthylamine), 2-Naphthylamine (β-Naphthylamine), and their derivatives; salts thereof, mixtures of 5- and 8-amino-2-naphthalene- sulfonic acid; 2-Naphthylamine-6-sulfonic acid; ando-Naphthionic acid (1-amino- 2-naphthalene- sulfonic acid).

### What is the general (MFN) duty on 2921.45.25.00 in the United States?

Goods under this line enter free of general (MFN) duty.

## 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/2921452500.json