# United States tariff line 2922.21.25.00: 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt

> In the United States tariff, line 2922.21.25.00 covers amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, aminohydroxynaphthalenesulfonic acids and their salts, 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2922.21 in heading 29.22 (chapter 29).

Source: https://border.bot/countries/united-states/hs-codes/2922212500
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) / [2922.21](https://border.bot/countries/united-states/hs-codes/292221) / [2922.21.25.00](https://border.bot/countries/united-states/hs-codes/2922212500)

## Key facts

- Tariff line: 2922.21.25.00
- Covers: Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, aminohydroxynaphthalenesulfonic acids and their salts, 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2922.21](https://border.bot/hs-codes/292221)

## What this line covers

In the United States tariff, line 2922.21.25.00 covers amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, aminohydroxynaphthalenesulfonic acids and their salts, 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt.

Its legal text is “1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt”, read under “Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof” and “Aminohydroxynaphthalenesulfonic acids and their salts”.

## How it is structured

It falls under HS subheading 2922.21 in heading 29.22 (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 29.22: Oxygen-function amino-compounds
- Subheading 2922.21: Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof
- Within the subheading: Aminohydroxynaphthalenesulfonic acids and their salts
- Line 2922.21.25.00: 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt

## 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 2922.21 yet.

- [The Harmonized System text for 2922.21](https://border.bot/hs-codes/292221)

## Other lines under 2922.21

- [2922.21.10.00](https://border.bot/countries/united-states/hs-codes/2922211000) 1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its salts
- [2922.21.40.00](https://border.bot/countries/united-states/hs-codes/2922214000) Products described in additional U.S. note 3 to section VI
- [2922.21.50.00](https://border.bot/countries/united-states/hs-codes/2922215000) Other

- Previous line: [2922.21.10.00](https://border.bot/countries/united-states/hs-codes/2922211000) 1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its salts
- Next line: [2922.21.40.00](https://border.bot/countries/united-states/hs-codes/2922214000) Products described in additional U.S. note 3 to section VI

## Frequently asked questions

### What does tariff line 2922.21.25.00 cover in the United States tariff?

In the United States tariff, line 2922.21.25.00 covers amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, aminohydroxynaphthalenesulfonic acids and their salts, 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt.

### What is the general (MFN) duty on 2922.21.25.00 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/2922212500.json