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HSChapter 40
U.S. imports of isobutene-isoprene (butyl) rubber (iir) (HS 4002310000) totaled $1.2M in June 2026, traded with 14 countries.
Importers of Isobutene-Isoprene (butyl) Rubber (iir) paid $3K in duties in June 2026 — an effective duty rate of 0.4% on $649K in dutiable value, based on actual customs collections rather than the published tariff schedule. Isobutene-Isoprene (butyl) Rubber (iir) imports of $1.2M in June 2026 ran 17% below the year-to-date monthly average of $1.4M.
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Monthly import values over time
No geographic breakdown available
U.S. trade for this product is not broken down by state or port in the latest Census Bureau release.