U.S. imports of Antiknock Preparations (SITC 59721) totaled $1.8M in August 2026, imported from 8 countries.
Importers of Antiknock Preparations paid $209K in duties in August 2026, an average duty rate of 11.80% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Antiknock Preparations imports of $1.8M in August 2026 ran 10% below the year-to-date monthly average of $2.0M.
Last updated: August 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
17 import shipments a month
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.
Basic heading 377 of 465 in section 5
Basic heading 59721 · $1.8M of $27.5B
Imports · August 2026
origin
United Kingdom and Italy together supply 92% of it. China pays 44.0% duty; Canada 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
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ImportsExports
Imports
$1.8MYoY · free account
Exports
$1.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $20.2M of Antiknock Preparations and exported $21.5M.
Through August 2026. Source: U.S. Census Bureau.