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HSChapter 29
U.S. imports of buta-1,3-diene and isoprene (HS 290124) totaled $15.8M in April 2026, traded with 7 countries.
Importers of Buta-1,3-Diene and Isoprene paid $443K in duties in April 2026 — an effective duty rate of 10% on $4.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Buta-1,3-Diene and Isoprene imports of $15.8M in April 2026 ran 14% below the year-to-date monthly average of $18.4M.
Last updated: April 2026 dataButa-1,3-diene and isoprene are conjugated diene hydrocarbons that serve as the primary monomers for synthetic rubber — including styrene-butadiene rubber (SBR) and polyisoprene — making them indispensable to the tire and automotive industries. The US HTS schedule distinguishes isoprene by purity threshold: line 2901242000 covers isoprene at 95% or greater purity by weight, while 2901245000 covers lower-purity isoprene, and 2901243000 captures isoprene not otherwise specified. Canada and South Korea are the leading US import sources, with the Netherlands, Taiwan, and Brazil also supplying the market. Correct purity documentation is essential for proper tariff-line classification of isoprene shipments.
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The US schedule separates isoprene by purity: 2901242000 applies to isoprene with a purity of 95% or more by weight, 2901245000 to isoprene below that threshold, and 2901243000 to isoprene not elsewhere specified. A certified certificate of analysis (CoA) stating the purity percentage is the key document for determining the correct classification and should accompany every shipment.
Buta-1,3-diene is a byproduct of steam cracking, so its availability is closely tied to ethylene production rates and naphtha cracker utilization. Supply tightness in Canada or South Korea — the leading US sources — can quickly affect downstream synthetic rubber manufacturers. Importers relying on a single origin should monitor cracker turnaround schedules and consider maintaining strategic inventory buffers.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2901241000 | BUTA-1,3-DIENE | $11.3M | -- | -- |
| 2901242000 | ISOPRENE PURITY OF 95% OR MORE BY WEIGHT | $4.1M | 10.00% | $408K |
| 2901245000 | ISOPRENE PURITY LESS THAN 95% BY WEIGHT | $350K | 10.00% | $35K |
BUTA-1,3-DIENE
ISOPRENE PURITY OF 95% OR MORE BY WEIGHT
ISOPRENE PURITY LESS THAN 95% BY WEIGHT
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2901241000 | BUTA-1,3-DIENE AND ISOMER THEREOF, UNSATURATED | $8.3M |
| 2901243000 | ISOPRENE | $540K |
BUTA-1,3-DIENE AND ISOMER THEREOF, UNSATURATED
6.8M kg
ISOPRENE
444.5K 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
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | $11.3M | $540K | -$10.8M |
| NEW ORLEANS, LA | -- | $8.3M | +$8.3M |
| HOUSTON, TX | $4.1M | -- | -$4.1M |