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HSChapter 29
U.S. imports of hfo-1234yf, hfo-1234ze, and hfo-1336mzz (HS 290351) totaled $9.1M in April 2026, traded with 6 countries.
Importers of HFO-1234yf, HFO-1234ze, and HFO-1336mzz paid $311K in duties in April 2026 — an effective duty rate of 3.7% on $8.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. HFO-1234yf, HFO-1234ze, and HFO-1336mzz imports of $9.1M in April 2026 ran 56% above the year-to-date monthly average of $5.8M.
Last updated: April 2026 dataHydrofluoroolefins (HFOs) represent the next-generation refrigerant technology designed to replace high-GWP HFCs in automotive air conditioning, commercial refrigeration, and foam-blowing applications. HFO-1234yf has become the mandated refrigerant for new passenger vehicle AC systems in the US and EU, driving substantial import demand. China leads US supply under tariff line 2903511000, with Mexico and South Korea as significant secondary sources. These compounds are unsaturated and chemically distinct from HFCs, giving them dramatically lower global warming potentials, which is why they are classified separately under heading 2903.51 rather than with saturated HFCs.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
HFOs contain a carbon-carbon double bond, making them unsaturated fluorinated derivatives, while HFCs are fully saturated. The HS nomenclature separates saturated and unsaturated halogenated hydrocarbons, placing HFOs in heading 2903.51 and saturated HFCs in earlier subheadings. This chemical distinction also underlies their much lower atmospheric lifetimes and GWP values.
China is the dominant import source, which creates concentration risk, particularly given Section 301 tariff exposure on Chinese-origin chemical imports. Automotive OEM supply chains have tight specification and continuity requirements, so importers should assess alternative sources in South Korea and Mexico and maintain safety stock to buffer against trade-policy or logistics disruptions.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| MEXICO | $715K | $16.4M | +$15.7M |
| CHINA | $7.9M | $4.1M | -$3.8M |
| NETHERLANDS | -- | $8.6M | +$8.6M |
| CANADA | -- | $6.4M | +$6.4M |
| UNITED KINGDOM | $20K | $5.3M | +$5.3M |
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2903511000 | HFO-1234YF, HFO-1234ZE AND HFO-1336MZZ | $9.1M | 3.70% | $311K |
HFO-1234YF, HFO-1234ZE AND HFO-1336MZZ
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2903511000 | HFO-1234YF, HFO-1234ZE AND HFO-1336MZZ | $45.9M |
HFO-1234YF, HFO-1234ZE AND HFO-1336MZZ
1.2M kg
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI
HS 293359
ANTIBIOTICS, NESOI
HS 294190
Supplier Network
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| State | Imports | Exports | Balance |
|---|---|---|---|
| Louisiana | $5.2M | $17.8M | +$12.6M |
| Texas | $617K | $13.2M | +$12.6M |
| Pennsylvania | -- | $7.2M | +$7.2M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | $715K | $16.4M | +$15.6M |
| HOUSTON, TX | $5.3M | $3.1M | -$2.3M |
| CINCINNATI-LAWRENCEBURG, OH | -- | $7.9M | +$7.9M |