U.S. exports of Butylenes, Butadienes, and Methylbutadienes (SITC 51113) totaled $31.3M in August 2026.
Importers of Butylenes, Butadienes, and Methylbutadienes paid $1.9M in duties in August 2026, an average duty rate of 7.98% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Butylenes, Butadienes, and Methylbutadienes imports of $24.2M in August 2026 ran 19% above the year-to-date monthly average of $20.3M.
Last updated: August 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
140 import shipments a month
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.
Basic heading 138 of 465 in section 5
Basic heading 51113 · $31.3M of $26.2B
Exports · August 2026
destination
Canada and Mexico together take 100% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$24.2MYoY · free account
Exports
$31.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $216.4M of Butylenes, Butadienes, and Methylbutadienes and exported $328.8M.
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
List your company and tag the 6-digit products you trade, so the companies trading them can find you. Be the first supplier listed.