Canada supplies 78.5% of U.S. imports of Halobutyl Rubber — Chlorobutyl (CIIR) & Bromobutyl (BIIR), across 11 countries (year to date through September 2026).
HHI 6,414 of 10,000 · HHI above 1,800. The sum of each country’s squared percentage share; one country with everything scores 10,000.
11 countries supplying this product to the U.S.
| Rank# | Country | Value | Share | YoY | Duty |
|---|---|---|---|---|---|
| 1 | Canada | $3.4M | 76.3% | -20.5% | 0.0% |
| 2 | United Kingdom | $495K | 11.0% | +7.4% | 10.0% |
| 3 | India | $354K | 7.9% | -49.5% | 10.0% |
| 4 | China | $197K | 4.4% | -63.5% | 37.5% |
| 5 | Germany | $17K | 0.4% | +537.3% | 10.0% |
| 6 | Ireland | $4K | 0.1% | -- | 10.0% |
| 7 | France | $1K | <0.1% | +363.6% | 10.1% |
| 8 | Switzerland | -- | 0.0% | -- | -- |
| 9 | Saudi Arabia | -- | 0.0% | -9.9% | -- |
| 10 | Dominican Republic | -- | 0.0% | -- | -- |
| 11 | Japan | -- | 0.0% | +24.7% | -- |
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.