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SITCSection 5
U.S. imports of antiknock preparations (SITC 59721) totaled $3.0M in April 2026, traded with 7 countries.
Importers of Antiknock Preparations paid $226K in duties in April 2026 — an effective duty rate of 7.5% on $3.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Antiknock Preparations imports of $3.0M in April 2026 ran 45% above the year-to-date monthly average of $2.1M.
Last updated: April 2026 dataAntiknock preparations are fuel additives formulated to suppress premature ignition (knock) in internal combustion engines, with tetraethyl lead historically dominant but now largely replaced by oxygenates and aromatic compounds under environmental regulations. Classification under SITC 59721 captures both legacy lead-based and modern non-lead formulations, making the specific chemical composition critical for customs and regulatory purposes. Importers should be aware that certain antiknock compounds face EPA scrutiny under the Clean Air Act, and the chemical nature of the preparation determines whether additional agency review applies.
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The specific active ingredients matter significantly: lead-based antiknock compounds face strict EPA restrictions and may be prohibited for use in motor fuels, while oxygenate-based or aromatic formulations are classified and regulated differently. Importers must confirm the chemical identity of the preparation before entry to ensure correct classification and compliance.
Yes. The EPA regulates fuel additives under the Clean Air Act, and certain antiknock compounds may require EPA registration or face use restrictions. Importers should verify whether their specific formulation is covered by EPA's fuel additive registration program prior to shipment.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| UNITED KINGDOM | $2.5M | $101K | -$2.4M |
| BELGIUM | $451K | $9K | -$442K |
| SAUDI ARABIA | -- | $331K | +$331K |
| CANADA | $42K | $289K | +$247K |
| MEXICO | -- | $116K | +$116K |
Monthly import values over time