China supplies 84.4% of U.S. imports of HFO-1234yf, HFO-1234ze, and HFO-1336mzz, across 6 countries (year to date through September 2026).
HHI 7,234 of 10,000 · HHI above 1,800. The sum of each country’s squared percentage share; one country with everything scores 10,000.
6 countries supplying this product to the U.S.
| Rank# | Country | Value | Share | YoY | Duty |
|---|---|---|---|---|---|
| 1 | China | $4.4M | 73.2% | +170.0% | 16.2% |
| 2 | Mexico | $758K | 12.5% | -20.8% | 0.0% |
| 3 | South Korea | $657K | 10.8% | +792.3% | 12.5% |
| 4 | Canada | $204K | 3.4% | +451.1% | 0.0% |
| 5 | United Kingdom | $8K | 0.1% | -45.0% | 13.7% |
| 6 | Japan | -- | 0.0% | +2012.8% | -- |
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.