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SITCSection 5
U.S. imports of sulfuric acid & oleum (SITC 52232) totaled $34.2M in April 2026, traded with 20 countries.
Importers of Sulfuric Acid & Oleum paid $713K in duties in April 2026 — an effective duty rate of 5.7% on $12.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataSulfuric acid — the world's most widely produced industrial chemical — and its fuming form, oleum (also called fuming sulfuric acid), are critical inputs for fertilizer manufacturing, petroleum refining, and battery electrolyte production. Both substances are classified as DOT hazardous materials and require strict packaging, labeling, and emergency response documentation for import shipments. Oleum, which contains excess dissolved sulfur trioxide, carries additional handling complexity due to its extreme reactivity with moisture, making concentration specification a key factor in both logistics planning and customs classification. EPA TSCA import certification is required for both substances.
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Oleum contains dissolved sulfur trioxide (SO₃) in excess of 100% H₂SO₄ concentration, making it chemically distinct from standard sulfuric acid. The SO₃ content percentage is the key specification that differentiates oleum grades and may affect classification, hazmat transport tier, and end-use documentation.
Fertilizer production (particularly phosphate fertilizers), petroleum refining, and lead-acid battery manufacturing are the dominant domestic end-use sectors. Import demand typically reflects regional supply gaps or price differentials rather than a structural dependence on foreign sources, given domestic production capacity.
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Monthly import values over time