抗爆剂分散液
CN → US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3811190000 | 41.5% | CN | US | Official Doc |
| 3811115000 | 35.0% | CN | US | Official Doc |
| 3824999397 | 40.0% | CN | US | Official Doc |
| 3824994900 | 41.5% | CN | US | Official Doc |
| 3811115000 | 35.0% | CN | US | Official Doc |
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AI Analysis
⛽ Anti-Explosive Agents & Dispersants (Anti-Knock Agents & Chemical Dispersants)
🌐 HS Code Reference & Customs Clearance Guide | 2024/2025 Latest Tariff Analysis | Professional Compliance Strategy
📌 I. Product Definition & Classification: Do You Truly Understand "Anti-Knock Agents"?
Anti-knock agents (commonly known as anti-explosive agents in fuel) and chemical dispersants are critical additives in the petrochemical and chemical industries. In international trade, they are strictly categorized based on their chemical composition, physical state, and functional purpose.
1. Anti-Knock Agents (Liquid Additives): - Lead-based: Compounds containing lead (e.g., tetraethyl lead derivatives). Note: Highly restricted in many regions due to toxicity, but still classified under specific HS codes. - Non-Lead/General: Methylcyclopentadienyl manganese tricarbonyl (MMT), organometallic compounds, or hydrocarbon-based blends.
2. Chemical Dispersants & Mixtures: - Industrial chemical preparations used to disperse pigments, fillers, or other solids in liquids. - Often classified under "Chemical preparations" if they don't fit specific fuel additive categories.
⚠️ Key Distinction Point:
- If the product is a pure lead-based compound intended to increase octane rating →归入 3811.11.50.00
- If the product is a general liquid additive without specific lead composition (or generic "anti-explosive" description) →归入 3811.19.00.00
- If the product is a chemical mixture/dispersant not primarily for fuel octane improvement but for industrial dispersion/cleaning →归入 3824.99.93.97 or 3824.99.49.00
📦 II. HS Code Classification Details (Based on Provided Data)
| HS Code | Product Description | Key Characteristics | Primary Use Case |
|--------|----------|--------------------------|
| 3811.19.00.00 | Anti-knock agents, liquid additives | Generic liquid formulation, no specific material/phase conflict mentioned. | General fuel additives, non-leaded anti-knock blends. |
| 3811.11.50.00 | Anti-knock agents, based on lead compounds or other chemical compounds, liquid form | Specifically contains lead compounds or defined chemical anti-knock structures. | Lead-based anti-knock agents, lead-based nano-dispersions for fuel. |
| 3824.99.93.97 | Chemical preparations, cleaning/dispersing agents, chemical mixtures | Broad category for chemical mixtures, often used for cleaning or general dispersion. | Industrial cleaning agents, general chemical dispersants. |
| 3824.99.49.00 | Chemical products and preparations for the chemical industry, dispersants | Specific industrial chemical preparations, focused on dispersion properties. | Industrial dispersants for paint, ink, or coating industries. |
🔍 Critical Note:
-3811.11.50.00is the most specific for lead-based anti-knock agents. If your product is a "Lead-based Anti-Knock Agent Nano-Dispersion," this is the correct code.
-3811.19.00.00is the "catch-all" for liquid anti-knock agents that are not specifically lead-based or fall under generic descriptions.
-3824codes are for chemical preparations that are primarily dispersants or cleaning agents, not necessarily fuel anti-knock agents. Misclassification here can lead to significant duty differences.
💰 III. 2024/2025 Latest Tariff Rate Breakdown (Including Additional Duties & Policy Surcharges)
✅ Applicable Country: United States (US)
✅ Country of Origin: China (CN)
✅ Effective Date: Current tariffs include Section 301 and Section 122 surcharges.
🎯 1. 3811.19.00.00 —— Generic Liquid Anti-Knock Agents
| Item | Detail |
|---|---|
| Base Tariff | 6.5% (Ad Valorem) |
| Section 301 Surcharge | +25.0% |
| Section 122 Surcharge | +10.0% |
| Total Tax Rate | 41.5% |
| Calculation | CIF Value × 41.5% |
| De Minimis Exemption | ❌ Not Eligible (Section 301/122 duties apply) |
| Legal Basis | HTSUS 3811.19.00.00 → Section 301 Footnote → Section 122 Authority |
📌 Explanation:
- The 6.5% base duty is the standard MFN rate for fuel additives.
- The 25% Section 301 tariff applies to a wide range of Chinese chemical products.
- The 10% Section 122 tariff is an additional surcharge on certain imports.
- Total: 41.5%. This is a high-cost category. Precise classification is vital to avoid overpayment or underpayment penalties.
🎯 2. 3811.11.50.00 —— Lead-Based Anti-Knock Agents
| Item | Detail |
|---|---|
| Base Tariff | 0.0% (Ad Valorem) |
| Section 301 Surcharge | +25.0% |
| Section 122 Surcharge | +10.0% |
| Total Tax Rate | 35.0% |
| Calculation | CIF Value × 35.0% |
| De Minimis Exemption | ❌ Not Eligible |
| Legal Basis | HTSUS 3811.11.50.00 → Section 301 Footnote → Section 122 Authority |
📌 Explanation:
- Interestingly, the base tariff is 0%, which is lower than generic additives.
- However, the 25% + 10% surcharges remain, bringing the total to 35.0%.
- Savings: Compared to3811.19.00.00(41.5%), this code saves 6.5% on the base duty.
- Crucial: This code must be used for lead-based products. Using3811.19.00.00for lead-based items is a misclassification risk.
🎯 3. 3824.99.93.97 & 3824.99.49.00 —— Chemical Dispersants & Preparations
| HS Code | Base Tariff | Section 301 | Section 122 | Total Rate |
|---|---|---|---|---|
3824.99.93.97 |
5.0% | 25.0% | 10.0% | 40.0% |
3824.99.49.00 |
6.5% | 25.0% | 10.0% | 41.5% |
📌 Explanation:
- These codes apply to chemical mixtures and dispersants.
- If your product is a nano-dispersion of lead-based anti-knock agents, it may still fall under3811.11.50.00(35.0%) if the primary function is anti-knock.
- If it is a cleaning dispersant or general chemical mixture, it falls under3824.
- Optimization:3824.99.93.97offers a slightly lower base duty (5.0%) than3811.19.00.00(6.5%), but both are high.
🛠️ IV. Customs Clearance Practical Advice (Avoid Pitfalls)
✅ 1. Documentation Checklist (Mandatory)
| Document | Required | Notes |
|---|---|---|
| ✅ Certificate of Analysis (COA) | ✔️ | Must specify chemical composition, especially Lead content. |
| ✅ Safety Data Sheet (SDS) | ✔️ | Required for hazardous chemicals. Must match HS classification. |
| ✅ Product Specification Sheet | ✔️ | Detail: Liquid state, viscosity, primary active ingredients. |
| ✅ Commercial Invoice | ✔️ | Clearly state: "Anti-knock agent, lead-based/non-leaded" or "Chemical dispersant". |
| ✅ Bill of Lading (B/L) | ✔️ | Ensure packaging details match invoice. |
| ✅ Origin Certificate | ✔️ | Essential for claiming duty drawbacks or verifying country of origin. |
✅ 2. Declaration Tips (Key Rules)
🔥 "Chemical Composition is King! Lead vs. Generic Determines Rate!"
| Scenario | Correct HS Code | Common Mistake | Consequence |
|---|---|---|---|
| Lead-based Anti-Knock Agent | 3811.11.50.00 (35%) |
Declared as 3811.19.00.00 (41.5%) |
Overpayment by 6.5% |
| Generic Liquid Anti-Knock | 3811.19.00.00 (41.5%) |
Declared as 3824.99.49.00 (41.5%) |
Risk of audit if not truly a dispersant. |
| Lead-based Nano-Dispersion | 3811.11.50.00 (35%) |
Declared as 3824.99.93.97 (40%) |
Overpayment by 5% + Misclassification Risk |
| Industrial Cleaning Dispersant | 3824.99.93.97 (40%) |
Declared as 3811.19.00.00 (41.5%) |
Overpayment by 1.5% |
✅ 3. Special Handling
| Situation | Recommendation |
|---|---|
| Lead-Based Products | Ensure SDS highlights lead content. Customs may require additional environmental compliance checks. |
| Nano-Dispersions | Clearly state "Nano-dispersion" in description. If primary function is anti-knock, use 3811.11.50.00. |
| Chemical Mixtures | Provide a detailed ingredient list. If >50% is a dispersant, consider 3824 codes. |
| High Value Shipments | Consider Advance Ruling from CBP to confirm HS code and avoid post-import audits. |
🌍 V. Global Market Comparison (2024/2025)
| Country/Region | Recommended HS Code | Base Duty | Additional Duties (China Origin) | Total Est. Duty |
|---|---|---|---|---|
| 🇺🇸 USA | 3811.11.50.00 / 3811.19.00.00 |
0% / 6.5% | +35% (301+122) | 35.0% / 41.5% |
| 🇨🇳 China | 3811.11.00.00 / 3811.19.00.00 |
6.5% / 6.5% | None | 6.5% |
| 🇪🇺 EU | 3811.10.00 |
6.5% | None | 6.5% |
| 🇯🇵 Japan | 3811.10.00 |
6.0% | None | 6.0% |
📌 Conclusion:
- The US market has the highest effective duty due to Section 301 and Section 122 surcharges.
- Lead-based products (3811.11.50.00) are the most cost-effective option in the US market (35% total) compared to generic anti-knock agents (41.5%).
- Misclassification between3811(fuel additives) and3824(chemical preparations) is a common audit target. Ensure the primary function is clearly documented.
📌 VI. Common Errors & Pitfalls (Lessons Learned)
❌ Error 1: Declaring Lead-based Anti-Knock Agents as 3811.19.00.00
👉 Result: Paying 41.5% instead of 35.0%. Loss of 6.5% on every shipment!
❌ Error 2: Declaring Industrial Dispersants as 3811.19.00.00
👉 Result: Risk of misclassification penalties and potential 41.5% vs 40.0% discrepancy. Customs may challenge the "anti-knock" claim.
❌ Error 3: Not providing COA/SDS
👉 Result: Customs hold for additional testing or demurrage fees. Delayed clearance by 5-10 days.
❌ Error 4: Ignoring Section 122 Surcharge
👉 Result: Under-declaring duties by 10%. Leads to back payments + interest + penalties.
✅ Correct Approach:
"Lead-based Anti-Knock Agent, Liquid, Nano-Dispersion, for Gasoline Octane Improvement, CAS No. XXXXX, SDS Attached."
🎯 VII. Conclusion: Precision in Classification Saves Money!
🎯 Remember the Golden Rule:
🔹 "Lead-based = 35% (3811.11.50.00)"
🔹 "Generic Liquid = 41.5% (3811.19.00.00)"
🔹 "Chemical Dispersant = 40-41.5% (3824)"
🔹 "Lead-based is cheaper! Specify lead content!"
📌 Pro Tip:
If your product is a Lead-based Nano-Dispersion, explicitly state "Lead-based Anti-Knock Agent" in the commercial invoice and description. This allows you to utilize HS Code 3811.11.50.00 and save 6.5% on base duty.
📣 Immediate Action:
📞 Review your COA and SDS.
📝 Confirm Lead Content.
📦 Update Invoice Description to match3811.11.50.00if applicable.
🚀 Optimize your customs cost today!
✨ Professional Clearance, Start with Accurate Classification!
💼 Every percentage point counts in high-duty chemical imports!
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About HS Code Classification
The Harmonized System (HS) is an internationally standardized nomenclature developed by the World Customs Organization (WCO) to classify traded products. Over 200 countries use the HS system as the basis for customs tariffs, trade statistics, and import/export regulations.
Each HS code follows a hierarchical structure:
- Chapter (2 digits) — Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) — More specific grouping within the chapter
- Subheading (6 digits) — Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) — Country-specific extensions for further classification, such as US HTSUS 10-digit codes
Correct HS code classification is essential for smooth customs clearance, accurate duty payment, and compliance with trade regulations. Misclassification can lead to customs delays, overpayment of duties, or penalties.
When importing from CN to US, the applicable tariff rates may include:
- Most-Favored-Nation (MFN) rate — The standard duty rate applied to WTO members
- General rate — Applied to countries without trade agreements
- Trade remedy duties — Additional tariffs such as Section 301 (anti-dumping), Section 232 (national security), or countervailing duties
The information provided on this page is for reference purposes only. For official classification, please consult with your local customs authority or a licensed customs broker.