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Official data Source: US Census Bureau international trade data Data through August 2026 · updated monthly

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HS 4002.31

Isobutene-isoprene (butyl) rubber (iir) in primary forms or in plates, sheets or strip

In short

  • The US imported $14.4M of this product over the 12 months to August 2026, down 34% on the year before.
  • Canada is the largest supplier, with 59.9% of US imports; France is next, with 24.7%.
  • India is the cheapest main supplier before and after freight and duty, landing at $2.09/kg.
  • Duty paid averaged 2.5% of the value of imports in August 2026, up 2.4 points on a year earlier.
  • Canada is gaining share: 79.9% over the last 12 months, up from 55.5%.
  • US exports were $50.7M over the last 12 months; the largest market is Mexico, with 33.9%.

US imports, Aug 2026

$954K

↓ −51% vs Aug 2025

Last 12 months

$14.4M

↓ −34% vs the 12 months before

Average duty paid

2.5%

↑ +2.4 pts vs Aug 2025

Top supplier

Canada

59.9% of US imports

US imports by month

The last 13 months, so the same month a year ago is on the left. August 2026 is highlighted.

Aug2025SepOctNovDecJan2026FebMarAprMayJunJulAug
Show the numbers
MonthUS imports
August 2025$1.9M
September 2025$1.2M
October 2025$783K
November 2025$1.3M
December 2025$754K
January 2026$1.2M
February 2026$1.8M
March 2026$1.6M
April 2026$1.4M
May 2026$1.4M
June 2026$1.2M
July 2026$808K
August 2026$954K

What changed

  • US imports were $954K in August 2026, up 18% from July 2026 and down 51% from August 2025.
  • Over the 12 months to August 2026 they totalled $14.4M, down 34% on the 12 months before.
  • Biggest moves in market share since July 2026: France up from 0.0% to 24.7%, Canada down from 90.4% to 59.9%.
  • Average price from Canada rose 11% since July 2026, to $3.11/kg.
  • Duty paid by the main suppliers held within 2 points of July 2026.

US trade by year

US imports were $14.4M in the 12 months to Aug 2026, down 72% on the 12 months to Aug 2017. US exports were $50.7M, up 76%.

2017201820192020202120222023202420252026
Show the numbers
PeriodUS imports
12 months to Aug 2017$50.8M
12 months to Aug 2018$51.2M
12 months to Aug 2019$51.0M
12 months to Aug 2020$41.1M
12 months to Aug 2021$26.3M
12 months to Aug 2022$34.3M
12 months to Aug 2023$27.6M
12 months to Aug 2024$21.0M
12 months to Aug 2025$21.9M
12 months to Aug 2026$14.4M
  • Canada
  • India
  • Thailand
  • France
  • All countries
Share of US imports
Show the numbers
PeriodCanadaIndiaThailandFrance
12 months to Aug 201731.4%0.5%0.0%2.3%
12 months to Aug 201829.6%0.0%0.0%0.4%
12 months to Aug 201930.6%0.0%0.0%0.0%
12 months to Aug 202021.9%0.1%0.4%0.0%
12 months to Aug 202114.8%7.6%1.9%0.0%
12 months to Aug 202235.9%8.8%1.4%0.0%
12 months to Aug 202343.1%23.8%2.0%0.0%
12 months to Aug 202456.3%18.0%3.0%0.0%
12 months to Aug 202555.5%30.7%2.5%0.0%
12 months to Aug 202679.9%8.8%3.6%1.6%
Duty paid, % of value
Show the numbers
PeriodCanadaIndiaThailandFranceAll countries
12 months to Aug 20170.0%0.0%n/a0.0%0.0%
12 months to Aug 20180.0%0.0%0.0%0.0%0.0%
12 months to Aug 20190.0%0.0%0.0%0.0%0.0%
12 months to Aug 20200.0%0.0%0.0%0.0%0.0%
12 months to Aug 20210.0%0.0%0.0%0.0%0.0%
12 months to Aug 20220.0%0.0%0.0%0.0%0.0%
12 months to Aug 20230.0%0.0%0.0%0.0%0.0%
12 months to Aug 20240.0%0.0%0.0%0.0%0.0%
12 months to Aug 20250.0%0.0%0.0%0.9%0.0%
12 months to Aug 20260.2%0.0%0.0%10.0%0.6%
PeriodUS importsDuty paidUS exports
12 months to Aug 2026$14.4M−34%0.6%+0.5 pts$50.7M+37%
12 months to Aug 2025$21.9M+4.3%0.0%0.0 pts$37.0M+31%
12 months to Aug 2024$21.0M−24%0.0%0.0 pts$28.2M−13%
12 months to Aug 2023$27.6M−19%0.0%0.0 pts$32.4M+8.8%
12 months to Aug 2022$34.3M+31%0.0%0.0 pts$29.8M−52%
12 months to Aug 2021$26.3M−36%0.0%0.0 pts$62.2M+22%
12 months to Aug 2020$41.1M−19%0.0%0.0 pts$50.8M+48%
12 months to Aug 2019$51.0M−0.4%0.0%0.0 pts$34.2M+4.9%
12 months to Aug 2018$51.2M+0.7%0.0%0.0 pts$32.6M+13%
12 months to Aug 2017$50.8M0.0%$28.8M

Who supplies the US

August 2026. Small figures under each value are the change from August 2025. Landed cost by origin, below, adds freight and duty to the price.

CountryUS importsShareAverage priceDuty paidLast 13 months
Canada$572K59.9%+15.1 pts$3.11/kg+22%0.0%0.0 pts
France$235K24.7%+24.6 pts$13.73/kg−97%10.0%0.0 pts
Luxembourg$55K5.7%new$2.98/kg0.0%
China$49K5.1%+4.6 pts$0.79/kg−58%0.0%0.0 pts
Thailand$44K4.6%0.0 pts$2.45/kg+1.6%0.0%0.0 pts
All countries$954K100.0%$3.19/kg+42%2.5%+2.4 pts

The 3 largest suppliers had 92.4% of US imports over the last 12 months.

Landed cost by origin

What importers paid to land this product at a US port from each main supplier, June–August 2026: the price, freight and insurance to the first US port, and duty, per unit. Suppliers with 3% or more of these imports, cheapest landed first. Small figures under landed cost are the change from the same months a year earlier.

  • Price
  • Freight and insurance
  • Duty
CountryPriceFreight and insuranceDutyLanded costMake-up
India$2.05/kg$0.05/kg2.3% of price$0.00/kg0.0% of price$2.09/kg−3.8%
Thailand$2.51/kg$0.00/kg0.0% of price$0.00/kg0.0% of price$2.51/kg+5.1%
Canada$2.60/kg$0.01/kg0.5% of price$0.00/kg0.0% of price$2.61/kg−8.4%
France$13.73/kg$0.47/kg3.4% of price$1.37/kg10.0% of price$15.57/kg−96%
All countries$2.55/kg$0.06/kg2.4% of price$0.02/kg0.9% of price$2.64/kg0.0%

Landed at a US port, India was cheapest, at $2.09/kg: 16.5% below Thailand.

Landed cost from France fell 96% on a year earlier, to $15.57/kg, mostly on price: $402.00/kg then, $13.73/kg now.

How the market is shifting

Canada gained the most share: 79.9% of US imports over the last 12 months, up from 55.5% in the 12 months before. India lost the most: 8.8%, down from 30.7%. The charts show September 2024 to August 2026 for the 4 largest suppliers over the last 12 months.

  • Canada
  • India
  • Thailand
  • France
  • All countries
Share of US imports
Show the numbers
MonthCanadaIndiaThailandFrance
September 202456.3%19.1%0.0%0.0%
October 202453.5%32.8%1.6%0.0%
November 202461.3%12.4%3.5%0.0%
December 202465.6%4.3%1.3%0.1%
January 202527.1%64.3%4.2%0.0%
February 202543.2%43.8%2.6%0.1%
March 202546.2%32.3%1.5%0.0%
April 202555.4%35.8%3.7%0.0%
May 202562.7%32.6%2.4%0.0%
June 202589.3%6.8%0.0%0.0%
July 202576.0%15.7%4.1%0.0%
August 202544.8%49.3%4.5%0.0%
September 202566.1%32.1%0.0%0.0%
October 202585.3%0.0%8.0%0.0%
November 202589.4%0.0%3.3%0.0%
December 202581.7%0.0%6.2%0.0%
January 202682.6%3.6%7.2%0.0%
February 202683.3%13.9%0.0%0.0%
March 202694.4%0.0%2.7%0.0%
April 202682.6%6.3%3.1%0.0%
May 202683.4%7.5%3.3%0.0%
June 202653.8%32.8%4.0%0.0%
July 202690.4%0.0%7.2%0.0%
August 202659.9%0.0%4.6%24.7%
Duty paid, % of value
Show the numbers
MonthCanadaIndiaThailandFranceAll countries
September 20240.0%0.0%n/a0.0%0.0%
October 20240.0%0.0%0.0%n/a0.0%
November 20240.0%0.0%0.0%n/a0.0%
December 20240.0%0.0%0.0%0.0%0.0%
January 20250.0%0.0%0.0%n/a0.0%
February 20250.0%0.0%0.0%0.0%0.0%
March 20250.0%0.0%0.0%n/a0.0%
April 20250.0%0.0%0.0%0.0%0.0%
May 20250.0%0.0%0.0%n/a0.0%
June 20250.0%0.0%n/an/a0.2%
July 20250.0%0.0%0.0%n/a0.1%
August 20250.0%0.0%0.0%10.0%0.1%
September 20250.0%0.0%n/an/a0.1%
October 20250.0%n/a0.0%n/a0.9%
November 20250.0%n/a0.0%n/a0.1%
December 20250.0%0.0%0.0%n/a0.1%
January 20262.3%0.0%0.0%n/a3.2%
February 20260.0%0.0%n/an/a0.0%
March 20260.0%n/a0.0%10.1%0.1%
April 20260.0%0.0%0.0%n/a0.2%
May 20260.0%0.0%0.0%0.0%0.1%
June 20260.0%0.0%0.0%n/a0.2%
July 20260.0%n/a0.0%n/a0.0%
August 20260.0%n/a0.0%10.0%2.5%

Where it enters the US

Main ports of entry over the 12 months to August 2026: US imports and share.

  1. Port Huron, MI$11.5M · 80.1%
  2. Norfolk-Newport News, VA$1.2M · 8.4%
  3. Newark, NJ$364K · 2.5%
  4. Laredo, TX$313K · 2.2%
  5. Los Angeles, CA$181K · 1.3%

Where US exports go

US exports were $4.1M in August 2026, down 22% from August 2025, and $50.7M over the last 12 months, up 37% on the 12 months before. Fastest-growing market with 3% or more of US exports: China, up 823%.

MarketLast 12 monthsSharevs 12 months before
Mexico$17.2M33.9%+98%
Belgium$12.0M23.6%+9.4%
China$6.4M12.5%+823%
India$3.7M7.2%−8.2%
Brazil$2.6M5.2%+6.8%
Canada$2.1M4.2%−36%
Thailand$2.1M4.1%+4.1%
Korea, South$918K1.8%+3.2%
Other countries (20)$3.8M7.5%+9.9%
All countries$50.7M100.0%+37%

Markets abroad

Each country's own import figures for this product, from UN Comtrade: the 8 biggest importers outside the US in the latest year each has reported, what they bought from the US, and the change from the year before. Values usually include freight and insurance to the importer's border, so they run a little above US export figures. Countries report a year or more late; 95 have reported 2025 so far. Where a country's figure for imports from the US is under half or over double what the US recorded exporting there that year, the US figure is shown under it.

MarketImportsvs year beforeFrom the USUS share
China$249.2Min 2025+5.1%$724K0.3%
Thailand$53.0Min 2025−15%$6.3MUS records $2.1M11.9%
India$34.2Min 2025+6.5%$4.6M13.4%
Indonesia$29.6Min 2025+8.8%$4.0M13.6%
Belgium$26.7Min 2025+44%$10.5M39.2%
Pakistan$16.4Min 2025−26%$68K0.4%
Germany$16.3Min 2025−38%$5.5MUS records $84K33.8%
Korea, South$15.6Min 2025−11%$1.1M7.1%

The biggest market outside the US is China, which imported $249.2M of this product in 2025, 0.3% of that from the US.

The US supplies 39.2% of imports into Belgium, but under 10% into China, Pakistan and South Korea.

Of these, imports into Belgium grew fastest: up 44% from 2024 to 2025.

Other products under heading 4002: synthetic rubber and factice in primary forms etc.; mixtures of natural rubber or gums with synthetic rubber or factice, in primary forms etc.. US trade over the 12 months to August 2026.

ProductUS importsUS exports
Styrene-butadiene rubber (sbr) or carboxylated styrene-butadiene rubber (xsbr) in primary forms (except latex) or in plates, sheets or stripHS 4002.19$533.9M$425.7M
Ethylene-propylene-nonconjugated diene rubber (epdm) in primary forms or in plates, sheets or stripHS 4002.70$101.3M$638.9M
Butadiene rubber (br) in primary forms or in plates, sheets or stripHS 4002.20$59.5M$484.3M
Synthetic rubber and factice derived from oils, in primary forms or in plates, sheets or strip, not elsewhere specifiedHS 4002.99$121.4M$298.3M
Halo-isobutene-isoprene rubber (ciir or biir) in primary forms or in plates, sheets or stripHS 4002.39$43.3M$325.6M
Acrylonitrile-butadiene rubber (nbr) in primary forms (except latex) or in plates, sheets or stripHS 4002.59$125.3M$174.5M
Latex of styrene-butadiene rubber (sbr) or carboxylated styrene-butadiene rubber (xsbr)HS 4002.11$21.6M$97.0M
Isoprene rubber (ir) in primary forms or in plates, sheets or stripHS 4002.60$20.8M$96.8M
About these figures
  • Source: US Census Bureau international trade data, not seasonally adjusted, in US dollars. Retrieved November 3, 2026.
  • US imports are general imports at customs value, which excludes freight and insurance. Exports are at free-alongside-ship value.
  • Average price is customs value divided by quantity (kilograms), across all of the product's 10-digit lines.
  • Duty paid is the duty Census calculates on each country's imports for consumption, as a share of their value. It moves with tariff changes, exemptions and the mix of goods within the product.
  • Landed cost adds Census's import charges (freight, insurance and other costs of bringing the goods to the first US port) and calculated duty to the customs value, per unit, across the product's 10-digit lines. It leaves out antidumping and countervailing duties, customs fees and transport inland. Prices are averages across the goods within the code, so a lower one can mean cheaper goods, not the same goods for less.
  • Markets abroad are each country's imports as it reports them to UN Comtrade, in US dollars, usually including freight and insurance. Countries report a year or more late and in their own edition of the HS codes, so one still on an older edition is missing for codes that changed in 2022.
  • Census revises recent months, so figures can change slightly. These are estimates for research and planning, not customs or legal advice.

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