Subheading 34 of 41 in heading 2903
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.
Trade Directory
List your company under HS 290348 — HFC-365mfc and HFC-4310mee, so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share |
|---|---|---|---|---|
| 2903480000 | Hfc-365mfc and Hfc-4310mee | — | -- | -- |
ImportsExports
Imports
—YoY · free account
Exports
—YoY · free account
Low of 9 reported months · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $10.4M of HFC-365mfc and HFC-4310mee.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026 · imports 9 of 12 months reported, exports 9 of 12 months reported. Source: U.S. Census Bureau.
Imports · August 2026
origin
customs district
destination
entry
rate provision · imports
None recorded for this period.