# HS code 2921.21: Acyclic polyamines and their derivatives; salts thereof, ethylenediamine and its salts > HS code 2921.21 covers acyclic polyamines and their derivatives; salts thereof, ethylenediamine and its salts. It sits in heading 29.21 (amine-function compounds) in chapter 29 (organic chemicals). Other goods of heading 29.21 are classified under 2921.11 (acyclic monoamines and their derivatives; salts thereof, methylamine, di- or trimethylamine and their salts), 2921.12 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Dimethylamino)ethylchloride hydrochloride), 2921.13 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Diethylamino)ethylchloride hydrochloride), 2921.14 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Diisopropylamino)ethylchloride hydrochloride) or 13 others. National tariff lines under 2921.21 are live on border.bot for the United States (1 line, also used by 1 other country). Source: https://border.bot/hs-codes/292121 Last updated: 11 October 2026 [HS codes](https://border.bot/hs-codes) / [Chapter 29](https://border.bot/hs-codes/29) / [29.21](https://border.bot/hs-codes/2921) / [2921.21](https://border.bot/hs-codes/292121) ## Key facts - HS code: 2921.21 - Covers: Acyclic polyamines and their derivatives; salts thereof, ethylenediamine and its salts - Heading: [29.21: Amine-function compounds](https://border.bot/hs-codes/2921) - Chapter: [29: Organic chemicals](https://border.bot/hs-codes/29) - Edition: HS2022 - Duty in the United States: [See its 1 line](https://border.bot/countries/united-states/hs-codes/292121) ## What this code covers HS code 2921.21 covers acyclic polyamines and their derivatives; salts thereof, ethylenediamine and its salts. The legal text of the subheading is “Acyclic polyamines and their derivatives; salts thereof: Ethylenediamine and its salts”, read under “Acyclic polyamines and their derivatives; salts thereof”, in HS2022. ## What it doesn’t cover Other goods of heading 29.21 are classified under 2921.11 (acyclic monoamines and their derivatives; salts thereof, methylamine, di- or trimethylamine and their salts), 2921.12 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Dimethylamino)ethylchloride hydrochloride), 2921.13 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Diethylamino)ethylchloride hydrochloride), 2921.14 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Diisopropylamino)ethylchloride hydrochloride) or 13 others. - [2921.11](https://border.bot/hs-codes/292111) Acyclic monoamines and their derivatives; salts thereof: Methylamine, di- or trimethylamine and their salts - [2921.12](https://border.bot/hs-codes/292112) Acyclic monoamines and their derivatives; salts thereof: 2-(N,N-Dimethylamino)ethylchloride hydrochloride - [2921.13](https://border.bot/hs-codes/292113) Acyclic monoamines and their derivatives; salts thereof: 2-(N,N-Diethylamino)ethylchloride hydrochloride - [2921.14](https://border.bot/hs-codes/292114) Acyclic monoamines and their derivatives; salts thereof: 2-(N,N-Diisopropylamino)ethylchloride hydrochloride - [2921.19](https://border.bot/hs-codes/292119) Acyclic monoamines and their derivatives; salts thereof: Other - [2921.22](https://border.bot/hs-codes/292122) Acyclic polyamines and their derivatives; salts thereof: Hexamethylenediamine and its salts - [2921.29](https://border.bot/hs-codes/292129) Acyclic polyamines and their derivatives; salts thereof: Other - [2921.30](https://border.bot/hs-codes/292130) Cyclanic, cyclenic or cycloterpenic mono- or polyamines, and their derivatives; salts thereof - [2921.41](https://border.bot/hs-codes/292141) Aromatic monoamines and their derivatives; salts thereof: Aniline and its salts - [2921.42](https://border.bot/hs-codes/292142) Aromatic monoamines and their derivatives; salts thereof: Aniline derivatives and their salts - [2921.43](https://border.bot/hs-codes/292143) Aromatic monoamines and their derivatives; salts thereof: Toluidines and their derivatives; salts thereof - [2921.44](https://border.bot/hs-codes/292144) Aromatic monoamines and their derivatives; salts thereof: Diphenylamine and its derivatives; salts thereof - [2921.45](https://border.bot/hs-codes/292145) Aromatic monoamines and their derivatives; salts thereof: 1-Naphthylamine (alpha-naphthylamine), 2-naphthylamine (beta- naphthylamine) and their derivatives; salts thereof - [2921.46](https://border.bot/hs-codes/292146) Aromatic monoamines and their derivatives; salts thereof: Amfetamine (INN), benzfetamine (INN), dexamfetamine (INN), etilamfetamine (INN), fencamfamin (INN), lefetamine (INN), levamfetamine (INN), mefenorex (INN) and phentermine (INN); salts thereof - [2921.49](https://border.bot/hs-codes/292149) Aromatic monoamines and their derivatives; salts thereof: Other - [2921.51](https://border.bot/hs-codes/292151) Aromatic polyamines and their derivatives; salts thereof: o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof - [2921.59](https://border.bot/hs-codes/292159) Aromatic polyamines and their derivatives; salts thereof: Other ## How it is structured 2921.21 is a six-digit subheading. Its first two digits, 29, are the chapter; the first four, 2921, are heading 29.21; the last two, 21, identify the subheading within the heading. Countries add their own digits after these six for their national tariff lines. - Chapter 29: Organic chemicals - Heading 29.21: Amine-function compounds - Within the heading: Acyclic polyamines and their derivatives; salts thereof - Subheading 2921.21: Ethylenediamine and its salts ## In other countries National tariff lines under 2921.21 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/292121): 1 line, used by 1 other country - Previous subheading: [2921.19](https://border.bot/hs-codes/292119) Acyclic monoamines and their derivatives; salts thereof: Other - Next subheading: [2921.22](https://border.bot/hs-codes/292122) Acyclic polyamines and their derivatives; salts thereof: Hexamethylenediamine and its salts ## Frequently asked questions ### What does HS code 2921.21 cover? HS code 2921.21 covers acyclic polyamines and their derivatives; salts thereof, ethylenediamine and its salts. ### Which heading and chapter is HS code 2921.21 in? HS code 2921.21 is in heading 29.21 (amine-function compounds) in chapter 29 (organic chemicals). ### Where are goods of heading 29.21 classified when 2921.21 doesn’t fit? Other goods of heading 29.21 are classified under 2921.11 (acyclic monoamines and their derivatives; salts thereof, methylamine, di- or trimethylamine and their salts), 2921.12 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Dimethylamino)ethylchloride hydrochloride), 2921.13 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Diethylamino)ethylchloride hydrochloride), 2921.14 (acyclic monoamines and their derivatives; salts thereof, 2-(N,N-Diisopropylamino)ethylchloride hydrochloride) or 13 others. ### Which countries’ tariffs list national lines under HS code 2921.21? National tariff lines under 2921.21 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/292121.json