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HSChapter 29
U.S. imports of hfc-365mfc and hfc-4310mee (HS 290348) totaled $1.6M in June 2026, traded with 1 country.
Importers of HFC-365mfc and HFC-4310mee paid $214K in duties in June 2026 — an effective duty rate of 14% on $1.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. HFC-365mfc and HFC-4310mee imports of $1.6M in June 2026 ran 31% above the year-to-date monthly average of $1.2M.
HFC-365mfc serves as a specialty blowing agent for rigid polyurethane and phenolic foam systems, while HFC-4310mee (also known as Vertrel XF) is used as a precision cleaning and drying solvent in electronics and aerospace manufacturing. Both compounds enter under a single tariff line (2903480000), and Japan is the leading — and, based on trade data, essentially sole — US import source. Their relatively niche application profiles mean import volumes are modest but technically sensitive, with purity specifications critical for electronics-grade end uses.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Both compounds share a single 10-digit tariff line, 2903480000, which is dedicated exclusively to this pair. Importers do not need to distinguish between the two at the HTS classification level, but commercial invoices should clearly identify the specific compound for EPA AIM Act compliance and allocation tracking purposes.
Electronics and precision-cleaning applications typically require very high purity grades with tightly controlled moisture and particulate levels. Buyers should request certificates of analysis from the Japanese supplier and confirm that packaging and transport conditions prevent contamination, as off-spec material can cause yield losses in semiconductor cleaning processes.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| JAPAN | $1.6M | -- | -$1.6M |
| BRAZIL | -- | $19K | +$19K |
| SWITZERLAND | -- | $4K | +$4K |
| UNITED KINGDOM | -- | -- | -- |
| MEXICO | -- | -- | -- |
Monthly import values over time
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2903480000 | HFC-365MFC AND HFC-4310MEE | $1.6M | 13.70% | 100.00% | $214K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2903480000 | HFC-365MFC AND HFC-4310MEE | $23K |
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
BENZENE
HS 290220
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
HETEROCYCLIC COMP WITH UNFUSED PYRAZOLE RING NESOI
HS 293319
| State | Imports | Exports | Balance |
|---|---|---|---|
| Delaware | $696K | -- | -$696K |
| New Jersey | $696K | -- | -$696K |
| California | $171K | -- | -$171K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEWARK, NJ | $696K | -- | -$696K |
| NEW YORK, NY | $696K | -- | -$696K |
| LOS ANGELES, CA | $171K | -- | -$171K |