HS code · 6-digit subheading

HS Code 4002.39 – Rubber; synthetic, halo-isobutene-isoprene rubber (CIIR or BIIR), in primary forms or in plates, sheets or strip

HS code 4002.39 is the 6-digit subheading for rubber, synthetic, halo-isobutene-isoprene rubber (CIIR or BIIR), in primary forms or in plates, sheets or strip. It is used for chlorobutyl rubber bales, bromobutyl rubber sheets, CIIR compounds, BIIR pellets and halogenated butyl rubber.

What HS 4002.39 covers

This HS code pertains to halo-isobutene-isoprene rubber (CIIR or BIIR), also known as halogenated butyl rubber, in primary forms. This specialized synthetic rubber is a derivative of butyl rubber, offering enhanced cure versatility, improved adhesion to other rubbers, and superior gas barrier properties. It is predominantly used in tire inner liners, pharmaceutical stoppers, and high-performance seals. Global trade involves a few key chemical manufacturers supplying this material to tire companies and medical device producers. Its critical role in high-performance applications, where gas impermeability and heat resistance are paramount, ensures its steady demand in specific industrial niches, particularly in the automotive and healthcare sectors.

Covers
  • Chlorobutyl rubber bales
  • Bromobutyl rubber sheets
  • CIIR compounds
  • BIIR pellets
  • Halogenated butyl rubber
  • Tire inner liner material
Examples
  • Arlanxeo Chlorobutyl
  • ExxonMobil Bromobutyl
  • Lanxess Bromobutyl
  • Tubeless tire inner liners
  • Pharmaceutical bottle stoppers

Codes often confused with 4002.39

Common mistake. Frequently confused with non-halogenated butyl rubber (400231) due to similar base chemistry, but the 'halo' prefix is crucial for distinguishing its enhanced properties and applications.

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

Top exporters and importers of HS code 400239, 2025

In 2025, the largest exporter of HS code 400239 in UN Comtrade data was the United States, with 23% of world exports; the largest importer in UN Comtrade data was China, with 18% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.

Top exporters 2025 · share of world exports

  1. 1 United States $336M
  2. 2 Singapore $300M
  3. 3 Belgium $236M

World total: $1.5B Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 China $310M
  2. 2 Belgium $224M
  3. 3 India $116M

World total: $1.7B Reported figures on UN Comtrade ↗

How these figures are built

109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).

Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.

Brazil NCM code for 4002.39

Brazil does not split HS 4002.39: its NCM code is 4002.39.00.

  1. 4002.39.00 Halo-isobutene-isoprene rubber (CIIR or BIIR)Outras

All Brazil NCM codes in heading 40.02 →

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.

Questions about HS 4002.39

What is HS code 400239?

HS code 400239 is a 6-digit subheading in the Harmonized System that covers: Rubber; synthetic, halo-isobutene-isoprene rubber (CIIR or BIIR), in primary forms or in plates, sheets or strip. This HS code pertains to halo-isobutene-isoprene rubber (CIIR or BIIR), also known as halogenated butyl rubber, in primary forms. This specialized synthetic rubber is a derivative of butyl rubber, offering enhanced cure versatility, improved adhesion to other rubbers, and superior gas barrier properties. It is predominantly used in tire inner liners, pharmaceutical stoppers, and high-performance seals. Global trade involves a few key chemical manufacturers supplying this material to tire companies and medical device producers. Its critical role in high-performance applications, where gas impermeability and heat resistance are paramount, ensures its steady demand in specific industrial niches, particularly in the automotive and healthcare sectors.

What products fall under HS code 400239?

Chlorobutyl rubber bales, Bromobutyl rubber sheets, CIIR compounds, BIIR pellets, Halogenated butyl rubber, Tire inner liner material

What are common misclassifications for HS code 400239?

Frequently confused with non-halogenated butyl rubber (400231) due to similar base chemistry, but the 'halo' prefix is crucial for distinguishing its enhanced properties and applications.

Which countries are the top exporters of goods under HS code 400239?

In 2025, the top exporters of HS code 400239 in UN Comtrade data were the United States ($336M, 23% of world exports), Singapore ($300M) and Belgium ($236M). World exports came to about $1.5B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Which countries are the top importers of goods under HS code 400239?

In 2025, the top importers of HS code 400239 in UN Comtrade data were China ($310M, 18% of world imports), Belgium ($224M) and India ($116M). World imports came to about $1.7B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

How is HS code 400239 structured?

HS code 400239 is a 6-digit subheading under the Harmonized System. The first 2 digits (40) identify the chapter, digits 3-4 (02) identify the heading, and digits 5-6 (39) specify the subheading. This code is standardized globally by the World Customs Organization.

What is the Brazil NCM code for HS code 400239?

In Brazil, HS code 400239 is NCM 4002.39.00. The last two digits are 00 because Brazil does not split this HS code further.