Brazil NCM · 8-digit subitem

NCM 3815.90.91 – Isoprenylaluminium (IPRA) catalysts

NCM 3815.90.91 (also written 38159091) is Brazil's code for isoprenylaluminium (IPRA) catalysts. Its first 6 digits are HS code 3815.90.

Official description of NCM 3815.90.91

PortuguêsOfficial
Tendo como substância ativa o isoprenilalumínio (IPRA)
EnglishUnofficial translation

With isoprenylaluminium (IPRA) as the active substance

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

How to read NCM 3815.90.91

38Chapter 15Heading 90Subheading

HS code 3815.90
Same in every country

9Item 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 38 Chemical products n.e.c. Produtos diversos das indústrias químicas.
  2. Heading 38.15 Reaction initiators, reaction accelerators and catalytic preparations n.e.c. or included Iniciadores de reação, aceleradores de reação e preparações catalíticas, não especificados nem compreendidos noutras posições.
  3. Subheading 3815.90 Reaction initiators, reaction accelerators and catalytic preparations, unsupported, n.e.c. or included Outros
  4. Item 3815.90.9 Other Outros
  5. Subitem 3815.90.91 With isoprenylaluminium (IPRA) as the active substance Tendo como substância ativa o isoprenilalumínio (IPRA)

Other NCM codes under HS 3815.90

3815.90.10 Petroleum cracking catalystsPara craqueamento de petróleo 3815.90.92 Zinc oxide catalystsTendo como substância ativa o óxido de zinco 3815.90.93 Rare-earth oxide catalystsTendo como substância ativa óxidos de terras raras 3815.90.99 Other reaction initiators and catalystsOutros

Questions about NCM 3815.90.91

What is NCM 3815.90.91?

NCM 3815.90.91 (38159091) is the Brazilian (Mercosur) code for isoprenylaluminium (IPRA) catalysts. Its official Portuguese description is “Tendo como substância ativa o isoprenilalumínio (IPRA)”.

What is the HS code for NCM 3815.90.91?

HS 3815.90 (Reaction initiators, reaction accelerators and catalytic preparations, unsupported, n.e.c. or included). 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 3815.90.91?

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.