Brazil NCM · 8-digit subitem

NCM 3912.31.21 – Carboxymethylcellulose salts, content 75% or more

NCM 3912.31.21 (also written 39123121) is Brazil's code for carboxymethylcellulose salts, content 75% or more. Its first 6 digits are HS code 3912.31.

Official description of NCM 3912.31.21

PortuguêsOfficial
Com um teor de sais igual ou superior a 75 %, em peso
EnglishUnofficial translation

With a salt content of 75 % or more by weight

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

How to read NCM 3912.31.21

39Chapter 12Heading 31Subheading

HS code 3912.31
Same in every country

2Item 1Subitem

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 39 Plastics and articles thereof Plástico e suas obras.
  2. Heading 39.12 Cellulose and its chemical derivatives, n.e.c. or included, in primary forms Celulose e seus derivados químicos, não especificados nem compreendidos noutras posições, em formas primárias.
  3. Group 3912.3 Cellulose ethers: Éteres de celulose:
  4. Subheading 3912.31 Cellulose ethers; carboxymethylcellulose and its salts, in primary forms Carboximetilcelulose e seus sais
  5. Item 3912.31.2 Salts Sais
  6. Subitem 3912.31.21 With a salt content of 75 % or more by weight Com um teor de sais igual ou superior a 75 %, em peso

Other NCM codes under HS 3912.31

3912.31.11 Carboxymethylcellulose, CMC content 75% or moreCom um teor de carboximetilcelulose igual ou superior a 75 %, em peso 3912.31.19 Carboxymethylcellulose, CMC content below 75%Outros 3912.31.29 Carboxymethylcellulose salts, content below 75%Outros

Questions about NCM 3912.31.21

What is NCM 3912.31.21?

NCM 3912.31.21 (39123121) is the Brazilian (Mercosur) code for carboxymethylcellulose salts, content 75% or more. Its official Portuguese description is “Com um teor de sais igual ou superior a 75 %, em peso”.

What is the HS code for NCM 3912.31.21?

HS 3912.31 (Cellulose ethers; carboxymethylcellulose and its salts, in primary forms). 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 3912.31.21?

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.