Brazil NCM · 8-digit code

NCM 4002.31.00 – Isobutene-isoprene (butyl) rubber (IIR)

NCM 4002.31.00 (also written 40023100) is Brazil's code for isobutene-isoprene (butyl) rubber (IIR). Its first 6 digits are HS code 4002.31.

Official description of NCM 4002.31.00

PortuguêsOfficial
Borracha de isobuteno-isopreno (butila) (IIR)
EnglishUnofficial translation

Rubber; synthetic, isobutene-isoprene (butyl) rubber (IIR), in primary forms or in plates, sheets or strip

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

How to read NCM 4002.31.00

40Chapter 02Heading 31Subheading

HS code 4002.31
Same in every country

0Item 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. The last two digits are 00 because Brazil does not split this HS code further. The full 8-digit code is used on import declarations (DUIMP), invoices (NF-e) and tax filings.

Full classification path

  1. Chapter 40 Rubber and articles thereof Borracha e suas obras.
  2. Heading 40.02 Synthetic rubber and factice derived from oils, in primary forms or in plates, sheets or strip; mixtures of heading no. 4001 and 4002, in primary forms or in plates, sheets or strip Borracha sintética e borracha artificial derivada dos óleos, em formas primárias ou em chapas, folhas ou tiras; misturas dos produtos da posição 40.01 com produtos da presente posição, em formas primárias ou em chapas, folhas ou tiras.
  3. Group 4002.3 Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR): Borracha de isobuteno-isopreno (butila) (IIR); borracha de isobuteno-isopreno halogenada (CIIR ou BIIR):
  4. Subheading 4002.31 Rubber; synthetic, isobutene-isoprene (butyl) rubber (IIR), in primary forms or in plates, sheets or strip
  5. Subitem 4002.31.00 Rubber; synthetic, isobutene-isoprene (butyl) rubber (IIR), in primary forms or in plates, sheets or strip Borracha de isobuteno-isopreno (butila) (IIR)

Questions about NCM 4002.31.00

What is NCM 4002.31.00?

NCM 4002.31.00 (40023100) is the Brazilian (Mercosur) code for isobutene-isoprene (butyl) rubber (IIR). Its official Portuguese description is “Borracha de isobuteno-isopreno (butila) (IIR)”.

What is the HS code for NCM 4002.31.00?

HS 4002.31 (Rubber; synthetic, isobutene-isoprene (butyl) rubber (IIR), in primary forms or in plates, sheets or strip). 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 4002.31.00?

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.