Insecticide Synergist
CN → USAI Analysis
🦟 Insecticide Synergist (Chemical Enhancers)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional-Level Strategy
📌 1. Product Definition: What is an Insecticide Synergist?
An Insecticide Synergist is not an insecticide itself, but a chemical compound added to insecticide formulations to enhance the toxicity of the active ingredient against insects. It works by inhibiting the insect’s metabolic enzymes (particularly cytochrome P450 monooxygenases), preventing the insect from breaking down the primary toxicant.
Common examples include: * Piperonyl Butoxide (PBO): The most widely used synergist. * N-Butyl Thiolane (MGK 264) * S-Methoprene (sometimes functions as both insecticide and synergist)
⚠️ Key Distinction:
- If sold as a standalone chemical for formulation → Typically classified under Chapter 29 (Organic Chemicals).
- If sold as a finished preparation for retail/public health use → Typically classified under Chapter 38 (Miscellaneous Chemical Products).
- If mixed with an insecticide in a single package → Classified based on the essential character of the mixture (usually as the insecticide).
📦 2. HS Code Classification Details (2026 Latest Tariff Concordance)
| HS Code | Product Description | Application Scenario | Chemical Nature |
|---|---|---|---|
2933.39.80.90 |
Piperonyl Butoxide (PBO) – Other heterocyclic compounds with oxygen heteroatom(s) only | Raw chemical ingredient for pesticide formulation | ✅ Organic Chemical |
2933.99.80.90 |
N-Butyl Thiolane (MGK 264) – Other organic compounds | Raw chemical ingredient | ✅ Organic Chemical |
3808.93.00.00 |
Preparations for Anti-insect, Anti-rodent or Anti-fungal Purposes (Other) | Finished synergist blends or non-specific pest control mixes | ✅ Formulated Product |
3808.94.00.00 |
Insecticides, Rodenticides, Fungicides, Herbicides... (if synergist is part of a registered mix) | Pre-mixed pesticide products containing synergist | ✅ Formulated Product |
2933.99.80.10 |
Other Heterocyclic Compounds (if specific synergist not listed elsewhere) | Uncommon synergists | ✅ Organic Chemical |
🔍 Critical Note:
- PBO (Piperonyl Butoxide) is the most common synergist and often falls under2933.39.80.90(or similar subheadings depending on country) as a pure chemical.
- Do NOT classify standalone PBO under3808unless it is already mixed with other inactive ingredients for direct use.
- Finished Products: If the synergist is sold as part of a labeled pest control kit (e.g., “PBO + Permethrin Spray”), classify under Chapter 38.
💰 3. 2026 Latest Tariff Rate Details (US Import from China)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Date: November 10, 2025 (and subsequent imports)
🎯 1. 2933.39.80.90 – Piperonyl Butoxide (Pure Chemical)
| Item | Content |
|---|---|
| Base Rate | 5.3% (ad valorem) |
| USITC Additional Duty | +25% (from USITC Footnote 9903.88.01, Section 301) |
| IEEPA Additional Duty | +10% (against China/HK products, effective Nov 10, 2025) |
| Total Rate | 40.3% |
| Tax Calculation | CIF Value × 40.3% |
| De Minimis Eligibility | ❌ Not Eligible (deny_de_minimis) |
| Legal Basis | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:2933.39.80.90 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- PBO is considered a “chemical intermediate” and faces high additional duties due to its association with pesticide manufacturing from China.
- Total 40.3% significantly impacts cost margins. Pre-clearance is essential.
🎯 2. 3808.93.00.00 – Finished Synergist Preparations
| Item | Content |
|---|---|
| Base Rate | 5.3% |
| USITC Additional Duty | +25% (Section 301) |
| IEEPA Additional Duty | +10% (IEEPA) |
| Total Rate | 40.3% |
| Tax Calculation | CIF Value × 40.3% |
| De Minimis Eligibility | ❌ Not Eligible |
| Legal Basis | IEEPA:9903.01.25 → USITC:3808.93.00.00 → FOOTNOTE:9903.88.01 |
📌 Note:
- Finished preparations face the same high tariff burden as raw chemicals.
- Ensure the EPA registration number is clearly stated on the invoice if applicable.
🎯 3. 2933.99.80.90 – Other Synergists (e.g., MGK 264)
| Item | Content |
|---|---|
| Base Rate | 5.3% |
| USITC Additional Duty | +25% |
| IEEPA Additional Duty | +10% |
| Total Rate | 40.3% |
| Tax Calculation | CIF Value × 40.3% |
| De Minimis Eligibility | ❌ Not Eligible |
📌 Note:
- Even if the synergist is not PBO, it likely falls under similar Chapter 29/38 headings with identical additional duties.
🛠️ 4. Customs Clearance Practical Advice (Live Pitfall Avoidance Guide)
✅ 1. Required Documentation Checklist (Non-Negotiable)
| Document | Must Provide | Explanation |
|---|---|---|
| ✅ Certificate of Analysis (COA) | ✔️ | Prove chemical identity (e.g., PBO ≥ 98%) |
| ✅ Safety Data Sheet (SDS) | ✔️ | Required for hazardous chemicals; check UN number |
| ✅ EPA Registration Number | ✔️ | If selling as a finished pest control product |
| ✅ Commercial Invoice | ✔️ | Clearly state “Insecticide Synergist, Not for Resale as Final Product” if raw |
| ✅ Packing List | ✔️ | Detail net/gross weight, container type |
| ✅ Manufacturer’s Declaration | ✔️ | Confirm no banned additives or restricted substances |
✅ 2. Declaration Tips (Key Mnemonic)
🔥 “Raw Chemical = Ch29, Finished Mix = Ch38, Name It Right, Tax Avoids Bite!”
| Scenario | Correct Declaration | Incorrect Practice |
|---|---|---|
| Pure PBO powder/liquid | 2933.39.80.90 as “Piperonyl Butoxide” |
Declare as “Pesticide” → Triggers Ch38 scrutiny |
| Pre-mixed spray can | 3808.93.00.00 as “Pest Control Preparation” |
Declare as “Chemical Raw Material” → Misclassification |
| Bulk chemical for formulators | 2933.39.80.90 |
Use vague terms like “Additive” → Delayed Clearance |
✅ 3. Special Case Handling
| Case | Handling Suggestion |
|---|---|
| OEM Private Label PBO | Provide contract manufacturing agreement; prove it’s a raw material, not a finished consumer good |
| Synergist Mixed with Fungicide | Classify as “Miscellaneous Chemical Preparation” under 3808.94.00.00 if fungicide is not dominant |
| Small Sample Shipments | Still subject to 40.3% duty; no de minimis exemption |
| Non-Chinese Origin (e.g., India, EU) | May qualify for 0% additional duty if IEEPA/Section 301 exceptions apply; provide Certificate of Origin |
🌍 5. Global Market Customs Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification Required | Remarks |
|---|---|---|---|---|
| 🇺🇸 USA | 2933.39.80.90 |
40.3% | EPA (if finished) | High duty; check IEEPA exemptions |
| 🇨🇳 China | 2933.39.80.90 |
5.3% | N/A | Low import duty for raw chemicals |
| 🇪🇺 EU | 2933.39.80.90 |
0–6.5% | REACH Registration | REACH compliance critical for PBO |
| 🇦🇺 Australia | 2933.39.80.90 |
5% | APVMA Approval | Regulated by Agricultural and Veterinary Chemicals Code |
| 🇯🇵 Japan | 2933.39.80.90 |
5% | Fertilizer Control Law (if mixed) | Strict purity standards |
📌 Conclusion:
- USA is the most expensive market due to Section 301 + IEEPA duties.
- EU and Japan require strict regulatory compliance (REACH, FCL) but lower tariffs.
- China remains a low-tariff destination for raw imports but restricts exports of certain pesticides.
📌 6. Common Mistakes & Pitfalls (Blood-Learning Lessons)
❌ Mistake 1: Declaring PBO as “Fertilizer” or “Additive”
👉 Consequence: Customs flags for misclassification → Delay, Audit, or Penalty
❌ Mistake 2: Ignoring EPA Registration for Finished Products
👉 Consequence: Seizure of goods at US ports; product cannot be legally sold
❌ Mistake 3: Assuming De Minimis Applies
👉 Consequence: Unexpected 40.3% bill even for small parcels; no exemption for pesticides/chemicals
❌ Mistake 4: Using Incorrect Chemical Names (e.g., “Synergizer” instead of “Piperonyl Butoxide”)
👉 Consequence: HS Code mismatch → Higher scrutiny or incorrect duty assessment
✅ Correct Practice:
“Piperonyl Butoxide, CAS No. 51-03-6, Purity ≥98%, For Pesticide Formulation Only, Not for Retail Sale”
🎯 7. Conclusion: Precision Classification, Cost Optimization!
🎯 Remember the Mnemonic:
🔹 “Raw Ch29, Finished Ch38, US Tariff 40%, EPA Check Before You Ship!”
🔹 “Name it right, document it tight, save thousands on every shipment!”
📌 Pro Tip:
If your synergist is sourced from India, Vietnam, or the EU, you may avoid IEEPA/Section 301 duties.
Recommend applying for an HTSUS Exclusion or utilizing Free Trade Agreements (FTAs) where applicable.
📣 Immediate Action Required:
📞 Consult a licensed customs broker + Provide COA + Verify EPA status
🚀 Ensure your Insecticide Synergist clears customs smoothly, avoids penalties, and maximizes profit!
✨ Professional Customs Clearance Starts with Accurate Classification!
💼 Every Duty Paid Should Be Justified, Every Declaration, Precise!
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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.