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HSChapter 38
U.S. imports of antiknock preparations (non-lead-based) (HS 381119) totaled $493K in April 2026, traded with 5 countries.
Importers of Antiknock Preparations (Non-Lead-Based) paid $77K in duties in April 2026 — an effective duty rate of 17% on $451K in dutiable value, based on actual customs collections rather than the published tariff schedule. Antiknock Preparations (Non-Lead-Based) imports of $493K in April 2026 ran 48% above the year-to-date monthly average of $332K.
Last updated: April 2026 dataNon-lead antiknock preparations — including manganese-based (MMT), ferrocene-based, and oxygenate-blended formulations — are classified under a single 10-digit line (3811190000) and serve as the commercially dominant alternatives to leaded compounds in modern fuel systems. Belgium and India are the leading US import sources, with the United Kingdom and France also supplying meaningful volumes, reflecting Europe's and India's established specialty chemical industries. Importers should be aware that certain manganese-based additives face EPA scrutiny under the Clean Air Act's fuel additive registration program, requiring registration before commercial introduction.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Yes. Under the Clean Air Act, fuel additives — including non-lead antiknock preparations — must be registered with the EPA before they are introduced into commerce. Importers should confirm that the specific additive formulation holds a valid EPA fuel additive registration, as unregistered additives cannot legally be blended into motor fuels for US sale.
Belgium hosts major specialty chemical manufacturing hubs with long-standing expertise in petroleum additive chemistry, while India has developed a competitive export-oriented fine chemicals sector that includes fuel additive intermediates and finished formulations. Both countries supply a range of oxygenate and organometallic antiknock chemistries that meet US fuel specifications.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| BELGIUM | $451K | -- | -$451K |
| SAUDI ARABIA | -- | $331K | +$331K |
| CANADA | $42K | $174K | +$132K |
| UNITED KINGDOM | -- | $101K | +$101K |
| COLOMBIA | -- | $51K | +$51K |
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3811190000 | ANTIKNOCK PREPARATIONS, NESOI | $493K | 17.07% | $77K |
ANTIKNOCK PREPARATIONS, NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3811190000 | ANTIKNOCK PREPARATIONS, NESOI | $1.1M |
ANTIKNOCK PREPARATIONS, NESOI
280.2K kg
PRODUCTS AND RESIDUALS OF CHEMICAL INDUSTRY, NESOI
HS 382499
DIAGNOSTIC OR LABORATORY REAGENTS INCL KITS, NESOI
HS 382219
CHEM ELEM DOPED, USED IN ELECTRON, DISCS WAFERS ET
HS 381800
SUPPORTED CATALYSTS W PREC METAL/PREC MTL COMPND
HS 381512
SUPPORTED CATALYSTS, NESOI
HS 381519
ADDITIVE FOR LUB OIL CONT PETRO/BITUMINOUS MINOIL
HS 381121
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NORFOLK-NEWPORT NEWS, VA | $15K | $251K | +$237K |
| NEWARK, NJ | $257K | -- | -$257K |
| HOUSTON, TX | $134K | $33K | -$101K |