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HSChapter 29
U.S. imports of butene (butylene) and its isomers (HS 290123) totaled $359K in June 2026, traded with 2 countries.
Importers of Butene (Butylene) and Its Isomers paid $26K in duties in June 2026 — an effective duty rate of 10% on $259K in dutiable value, based on actual customs collections rather than the published tariff schedule. Butene (Butylene) and Its Isomers imports of $359K in June 2026 ran 330% above the year-to-date monthly average of $83K.
Butene and its structural isomers — including 1-butene, 2-butene, and isobutylene — are C4 unsaturated acyclic hydrocarbons classified under a single 10-digit line (2901230000) as unsaturated. These olefins are critical feedstocks for polyethylene, polypropylene, and synthetic rubber production, as well as fuel-blending components. Canada is the dominant US supplier, with China, France, and South Korea also contributing meaningfully to import volumes. Importers should be aware that Chinese-origin shipments may be subject to Section 301 tariffs.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
All butene isomers — 1-butene, cis- and trans-2-butene, and isobutylene — fall under the single 10-digit tariff line 2901230000 as unsaturated acyclic hydrocarbons. There is no separate HTS subdivision by isomer type at the 10-digit level, so the specific isomer should be documented in commercial invoices and technical data sheets for customs purposes.
Yes. Butene originating from China may be subject to Section 301 tariffs in addition to the standard column 1 duty rate. Importers should verify the current Section 301 list status and any applicable exclusions with a licensed customs broker before shipment.
Monthly import values over time
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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 |
|---|---|---|---|---|---|
| 2901230000 | BUTENE (BUTYLENE) AND ISOMERS THEREOF | $359K | 7.21% | 72.05% | $26K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2901230000 | BUTENE (BUTYLENE) AND ISOMERS THEREOF, UNSATURATED | $14.2M |
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 |
|---|---|---|---|
| Texas | $359K | $14.2M | +$13.8M |
| Connecticut | -- | $52K | +$52K |
| Ohio | -- | $7K | +$7K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | $100K | $7.2M | +$7.1M |
| PORTAL, ND | -- | $6.8M | +$6.8M |
| HOUSTON, TX | $259K | $92K | -$166K |