# HS code 3102.21: Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, ammonium sulphate

> HS code 3102.21 covers ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, ammonium sulphate. It sits in heading 31.02 (mineral or chemical fertilisers, nitrogenous) in chapter 31 (fertilisers). Other goods of heading 31.02 are classified under 3102.10 (urea, whether or not in aqueous solution), 3102.29 (ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, other), 3102.30 (ammonium nitrate, whether or not in aqueous solution), 3102.40 (mixtures of ammonium nitrate with calcium carbonate or other inorganic non-fertilising substances) or 4 others. National tariff lines under 3102.21 are live on border.bot for the United States (1 line, also used by 1 other country).

Source: https://border.bot/hs-codes/310221
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 31](https://border.bot/hs-codes/31) / [31.02](https://border.bot/hs-codes/3102) / [3102.21](https://border.bot/hs-codes/310221)

## Key facts

- HS code: 3102.21
- Covers: Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, ammonium sulphate
- Heading: [31.02: Mineral or chemical fertilisers, nitrogenous](https://border.bot/hs-codes/3102)
- Chapter: [31: Fertilisers](https://border.bot/hs-codes/31)
- Edition: HS2022
- Duty in the United States: [See its 1 line](https://border.bot/countries/united-states/hs-codes/310221)

## What this code covers

HS code 3102.21 covers ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, ammonium sulphate.

The legal text of the subheading is “Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Ammonium sulphate”, read under “Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate”, in HS2022.

## What it doesn’t cover

Other goods of heading 31.02 are classified under 3102.10 (urea, whether or not in aqueous solution), 3102.29 (ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, other), 3102.30 (ammonium nitrate, whether or not in aqueous solution), 3102.40 (mixtures of ammonium nitrate with calcium carbonate or other inorganic non-fertilising substances) or 4 others.

- [3102.10](https://border.bot/hs-codes/310210) Urea, whether or not in aqueous solution
- [3102.29](https://border.bot/hs-codes/310229) Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Other
- [3102.30](https://border.bot/hs-codes/310230) Ammonium nitrate, whether or not in aqueous solution
- [3102.40](https://border.bot/hs-codes/310240) Mixtures of ammonium nitrate with calcium carbonate or other inorganic non-fertilising substances
- [3102.50](https://border.bot/hs-codes/310250) Sodium nitrate
- [3102.60](https://border.bot/hs-codes/310260) Double salts and mixtures of calcium nitrate and ammonium nitrate
- [3102.80](https://border.bot/hs-codes/310280) Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution
- [3102.90](https://border.bot/hs-codes/310290) Other, including mixtures not specified in the foregoing subheadings

## How it is structured

3102.21 is a six-digit subheading. Its first two digits, 31, are the chapter; the first four, 3102, are heading 31.02; the last two, 21, identify the subheading within the heading.

Countries add their own digits after these six for their national tariff lines.

- Chapter 31: Fertilisers
- Heading 31.02: Mineral or chemical fertilisers, nitrogenous
- Within the heading: Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate
- Subheading 3102.21: Ammonium sulphate

## In other countries

National tariff lines under 3102.21 are live on border.bot for the United States (1 line, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/310221): 1 line, used by 1 other country

- Previous subheading: [3102.10](https://border.bot/hs-codes/310210) Urea, whether or not in aqueous solution
- Next subheading: [3102.29](https://border.bot/hs-codes/310229) Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Other

## Frequently asked questions

### What does HS code 3102.21 cover?

HS code 3102.21 covers ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, ammonium sulphate.

### Which heading and chapter is HS code 3102.21 in?

HS code 3102.21 is in heading 31.02 (mineral or chemical fertilisers, nitrogenous) in chapter 31 (fertilisers).

### Where are goods of heading 31.02 classified when 3102.21 doesn’t fit?

Other goods of heading 31.02 are classified under 3102.10 (urea, whether or not in aqueous solution), 3102.29 (ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate, other), 3102.30 (ammonium nitrate, whether or not in aqueous solution), 3102.40 (mixtures of ammonium nitrate with calcium carbonate or other inorganic non-fertilising substances) or 4 others.

### Which countries’ tariffs list national lines under HS code 3102.21?

National tariff lines under 3102.21 are live on border.bot for the United States (1 line, also used by 1 other country).

## Sources and updates

The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.

This page was last updated on 11 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.

Machine-readable: https://border.bot/hs-codes/310221.json