Canada supplies 79.1% of U.S. imports of Isobutene-Isoprene (Butyl) Rubber (IIR), across 15 countries (year to date through September 2026).
HHI 6,379 of 10,000 · HHI above 1,800. The sum of each country’s squared percentage share; one country with everything scores 10,000.
15 countries supplying this product to the U.S.
| Rank# | Country | Value | Share | YoY | Duty |
|---|---|---|---|---|---|
| 1 | Canada | $1.1M | 74.0% | +7.0% | 0.0% |
| 2 | India | $250K | 17.4% | -80.2% | 0.0% |
| 3 | Thailand | $87K | 6.0% | +9.1% | 0.0% |
| 4 | Japan | $21K | 1.5% | +46.5% | 12.5% |
| 5 | China | $15K | 1.0% | -64.2% | 0.0% |
| 6 | Germany | -- | 0.0% | -99.4% | -- |
| 7 | Poland | -- | 0.0% | -- | -- |
| 8 | Italy | -- | 0.0% | -90.8% | -- |
| 9 | Luxembourg | -- | 0.0% | -- | -- |
| 10 | United Kingdom | -- | 0.0% | -73.9% | -- |
| 11 | Malaysia | -- | 0.0% | +20.6% | -- |
| 12 | South Korea | -- | 0.0% | +59.3% | -- |
| 13 | Taiwan | -- | 0.0% | -- | -- |
| 14 | France | -- | 0.0% | +10136.1% | -- |
| 15 | Mexico | -- | 0.0% | +1769.6% | -- |
Duty is the duty Census calculated on this month's imports for consumption from each country, as a share of their customs value. It applies the rates in force, additional duties such as Section 301, 232 and IEEPA included and claimed trade-agreement preferences netted out, so it is an observed rate rather than a statutory one. It is an estimate, not duty collected: antidumping and countervailing duties, fees and later refunds are not in it. YoY compares year-to-date value with the same months last year.