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SITCSection 5
U.S. imports of butylenes, butadienes, and methylbutadienes (SITC 51113) totaled $15.8M in April 2026, traded with 7 countries.
Importers of Butylenes, Butadienes, and Methylbutadienes 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. Butylenes, Butadienes, and Methylbutadienes imports of $15.8M in April 2026 ran 15% below the year-to-date monthly average of $18.4M.
Last updated: April 2026 dataThis grouping covers the C4 olefin and diolefin family — including 1-butene, 2-butene, isobutylene, 1,3-butadiene, and isoprene (2-methylbutadiene) — which are co-produced in steam crackers and FCC units and separated from the mixed C4 stream through extractive distillation. Butadiene is the most strategically traded member of this group, serving as the primary monomer for styrene-butadiene rubber (SBR) and polybutadiene rubber (PBR) used in tire manufacturing. Isoprene feeds synthetic polyisoprene rubber production. All members of this group are flammable gases or volatile liquids subject to DOT hazmat transport requirements.
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Butadiene is the key monomer for synthetic rubber used in tires, and its supply is structurally tied to naphtha cracker operating rates — meaning supply tightens when crackers shift to lighter ethane feedstocks that yield less C4 byproduct. This makes butadiene availability cyclical and geographically concentrated, prompting tire manufacturers and rubber compounders to monitor cracker feedstock trends closely when planning import procurement.
Yes. 1,3-Butadiene is classified as a known human carcinogen by IARC and is regulated under OSHA's hazard communication standard and EPA's Clean Air Act as a hazardous air pollutant. Importers and terminal operators must maintain Safety Data Sheets, comply with OSHA process safety management rules if quantities exceed thresholds, and ensure storage and transfer equipment meets applicable NFPA and DOT standards.
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Monthly import values over time