# United States tariff line 2921.19.31.00: 3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride

> In the United States tariff, line 2921.19.31.00 covers acyclic monoamines and their derivatives; salts thereof, 3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2921.19 in heading 29.21 (chapter 29).

Source: https://border.bot/countries/united-states/hs-codes/2921193100
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) / [2921.19](https://border.bot/countries/united-states/hs-codes/292119) / [2921.19.31.00](https://border.bot/countries/united-states/hs-codes/2921193100)

## Key facts

- Tariff line: 2921.19.31.00
- Covers: Acyclic monoamines and their derivatives; salts thereof, 3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2921.19](https://border.bot/hs-codes/292119)

## What this line covers

In the United States tariff, line 2921.19.31.00 covers acyclic monoamines and their derivatives; salts thereof, 3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride.

Its legal text is “3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride”, read under “Acyclic monoamines and their derivatives; salts thereof” and “Other”.

## How it is structured

It falls under HS subheading 2921.19 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 2921.19: Acyclic monoamines and their derivatives; salts thereof
- Within the subheading: Other
- Line 2921.19.31.00: 3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride

## 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 2921.19 yet.

- [The Harmonized System text for 2921.19](https://border.bot/hs-codes/292119)

## Other lines under 2921.19

- [2921.19.11.00](https://border.bot/countries/united-states/hs-codes/2921191100) Mono-, di- and triethylamines;mono-, di-, and tri-(propyl- and butyl-)monoamines; salts of any of the foregoing
- [2921.19.61.10](https://border.bot/countries/united-states/hs-codes/2921196110) N,N-Dialkyl (methyl, ethyl or n-propyl)-2-chloroethylamines and their protonated salts
- [2921.19.61.20](https://border.bot/countries/united-states/hs-codes/2921196120) Bis(2-chloroethyl)ethylamine)
- [2921.19.61.30](https://border.bot/countries/united-states/hs-codes/2921196130) Chlormethine (INN) (bis(2-chloroethyl)methylamine)
- [2921.19.61.40](https://border.bot/countries/united-states/hs-codes/2921196140) Trichlormethine (INN) (tris(2-chloroethyl)amine)
- [2921.19.61.95](https://border.bot/countries/united-states/hs-codes/2921196195) Other

- Previous line: [2921.19.11.00](https://border.bot/countries/united-states/hs-codes/2921191100) Mono-, di- and triethylamines;mono-, di-, and tri-(propyl- and butyl-)monoamines; salts of any of the foregoing
- Next line: [2921.19.61.10](https://border.bot/countries/united-states/hs-codes/2921196110) N,N-Dialkyl (methyl, ethyl or n-propyl)-2-chloroethylamines and their protonated salts

## Frequently asked questions

### What does tariff line 2921.19.31.00 cover in the United States tariff?

In the United States tariff, line 2921.19.31.00 covers acyclic monoamines and their derivatives; salts thereof, 3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride.

### What is the general (MFN) duty on 2921.19.31.00 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/2921193100.json