Brazil NCM · 8-digit subitem

NCM 2811.19.20 – Phosphonic acid (phosphorous acid)

NCM 2811.19.20 (also written 28111920) is Brazil's code for phosphonic acid (phosphorous acid). Its first 6 digits are HS code 2811.19.

Official description of NCM 2811.19.20

PortuguêsOfficial
Ácido fosfônico (ácido fosforoso)
EnglishUnofficial translation

Phosphonic acid (phosphorous acid)

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

How to read NCM 2811.19.20

28Chapter 11Heading 19Subheading

HS code 2811.19
Same in every country

2Item 0Subitem

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 28 Inorganic chemicals; organic and inorganic compounds of precious metals; of rare earth metals, of radio-active elements and of isotopes Produtos químicos inorgânicos; compostos inorgânicos ou orgânicos de metais preciosos, de elementos radioativos, de metais das terras raras ou de isótopos.
  2. Heading 28.11 Inorganic acids and other inorganic oxygen compounds of non-metals; n.e.c. in heading no. 2806 to 2810 Outros ácidos inorgânicos e outros compostos oxigenados inorgânicos dos elementos não metálicos.
  3. Group 2811.1 Other inorganic acids: Outros ácidos inorgânicos:
  4. Subheading 2811.19 Inorganic acids; other than hydrogen fluoride Outros
  5. Subitem 2811.19.20 Phosphonic acid (phosphorous acid) Ácido fosfônico (ácido fosforoso)

Other NCM codes under HS 2811.19

2811.19.10 Sulphamic acid (aminosulphonic acid)Ácido aminossulfônico (ácido sulfâmico) 2811.19.30 Perchloric acidÁcido perclórico 2811.19.40 Fluoro-acids and other fluorine compoundsFluorácidos e outros compostos de flúor 2811.19.90 Other inorganic acidsOutros

Questions about NCM 2811.19.20

What is NCM 2811.19.20?

NCM 2811.19.20 (28111920) is the Brazilian (Mercosur) code for phosphonic acid (phosphorous acid). Its official Portuguese description is “Ácido fosfônico (ácido fosforoso)”.

What is the HS code for NCM 2811.19.20?

HS 2811.19 (Inorganic acids; other than hydrogen fluoride). 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 2811.19.20?

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.