Brazil NCM · 8-digit subitem

NCM 2921.59.32 – 4,4'-Diaminodiphenylamine-2-sulphonic acid, salts

NCM 2921.59.32 (also written 29215932) is Brazil's code for 4,4'-Diaminodiphenylamine-2-sulphonic acid, salts. Its first 6 digits are HS code 2921.59.

Official description of NCM 2921.59.32

PortuguêsOfficial
Ácido 4,4'-diaminodifenilamino-2-sulfônico e seus sais
EnglishUnofficial translation

4,4'-Diaminodiphenylamine-2-sulphonic acid and its salts

Nomenclatura Comum do Mercosul (Siscomex). Updated Oct 2026 · In force since Apr 2022 (Res Gecex 272/2021).

How to read NCM 2921.59.32

29Chapter 21Heading 59Subheading

HS code 2921.59
Same in every country

3Item 2Subitem

Added by Mercosur
Brazil, Argentina, Paraguay, Uruguay

The first 6 digits are the international HS code, so their meaning is the same in every country; Brazil publishes the text in Portuguese. Digits 7 and 8 are Brazil's own split of that HS code. The full 8-digit code is used on import declarations (DUIMP), invoices (NF-e) and tax filings.

Full classification path

  1. Chapter 29 Organic chemicals Produtos químicos orgânicos.
  2. Heading 29.21 Amine-function compounds Compostos de função amina.
  3. Group 2921.5 Aromatic polyamines and their derivatives; salts thereof: Poliaminas aromáticas e seus derivados; sais destes produtos:
  4. Subheading 2921.59 Amine-function compounds; aromatic polyamines and their derivatives, other than item no. 2921.51 Outros
  5. Item 2921.59.3 Diaminodiphenylamines and their derivatives; salts thereof Diaminodifenilaminas e seus derivados; sais destes produtos
  6. Subitem 2921.59.32 4,4'-Diaminodiphenylamine-2-sulphonic acid and its salts Ácido 4,4'-diaminodifenilamino-2-sulfônico e seus sais

Other NCM codes under HS 2921.59

2921.59.11 3,3'-Dichlorobenzidine3,3'-Diclorobenzidina 2921.59.19 Benzidine, its other derivatives and saltsOutros 2921.59.21 4,4'-Diaminodiphenylmethane4,4'-Diaminodifenilmetano 2921.59.29 Other diaminodiphenylmethanesOutros 2921.59.31 4,4'-Diaminodiphenylamine and its salts4,4'-Diaminodifenilamina e seus sais 2921.59.39 Other diaminodiphenylamines, derivatives, saltsOutros 2921.59.90 Other aromatic polyamines, derivatives and saltsOutros

Questions about NCM 2921.59.32

What is NCM 2921.59.32?

NCM 2921.59.32 (29215932) is the Brazilian (Mercosur) code for 4,4'-Diaminodiphenylamine-2-sulphonic acid, salts. Its official Portuguese description is “Ácido 4,4'-diaminodifenilamino-2-sulfônico e seus sais”.

What is the HS code for NCM 2921.59.32?

HS 2921.59 (Amine-function compounds; aromatic polyamines and their derivatives, other than item no. 2921.51). The first 6 digits of an NCM code are its international HS code; the last 2 digits are Brazil's own split.

Is an NCM code the same as an HS code?

The first 6 digits are the same in every country. NCM adds an item digit (7th) and a subitem digit (8th). A code ending in 00 means Brazil does not split that HS code further.

Which countries use NCM 2921.59.32?

All Mercosur members use the same NCM codes: Argentina, Brazil, Paraguay and Uruguay.

Source: Siscomex Classif NCM table, updated Oct 2026 (Resolução Gecex nº 926/2026). The Portuguese text is the official one; the English is our translation.