聚硫弹性体阻燃剂
CN → US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 4002990000 | 35.0% | CN | US | Official Doc |
| 4002800000 | 35.0% | CN | US | Official Doc |
| 3911901000 | 35.0% | CN | US | Official Doc |
| 3911100000 | 41.1% | CN | US | Official Doc |
| 3926909989 | 22.8% | CN | US | Official Doc |
AI Analysis
🧪 Polysulfide Elastomer Flame Retardant
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Entry Strategy
📌 I. Product Definition & Classification: Do You Really Understand "Polysulfide Elastomer"?
Polysulfide elastomers (also known as Thiokol) are a type of synthetic rubber characterized by excellent resistance to fuels, oils, and solvents. In international trade, they are primarily classified based on their chemical nature: either as Synthetic Rubber (Chapter 40) or as Plastics/Polymers (Chapter 39), depending on the specific formulation, state, and primary function. When combined with "Flame Retardant," the classification becomes critical because additives can sometimes shift the product’s perceived identity, though the base material usually dictates the HS code.
⚠️ Key Distinction Point:
- If the product is primarily a raw synthetic rubber used for sealing, adhesives, or elastomeric applications → Chapter 40 (Synthetic Rubber)
- If the product is considered a modified plastic/polymer with specific chemical properties not fully aligned with standard rubber definitions → Chapter 39 (Plastics/Polymers)
- Note: The presence of "flame retardant" additives does not automatically change the chapter, but it reinforces the need for precise material declaration to avoid misclassification penalties.
📦 II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Application Scenario | Material Basis |
|---|---|---|---|
4002.99.00.00 |
Other synthetic rubber; polysulfide elastomers | Sealants, adhesives, fuel-resistant hoses, gaskets | ✅ Polysulfide Synthetic Rubber |
4002.80.00.00 |
Other synthetic rubber from oils; polysulfide elastomers | Specific oil-based synthetic rubber formulations | ✅ Synthetic Rubber (Oil-derived) |
3911.90.10.00 |
Other polysulfides; primary forms | Chemical raw materials, specific polymer forms | ✅ Polysulfide Polymer/Plastic |
3911.10.00.00 |
Polysulfides; primary forms | Standard polysulfide polymers for industrial use | ✅ Polysulfide Polymer |
3926.90.99.89 |
Other articles of plastics; polysulfide blends | Finished plastic articles, non-rubber applications | ✅ Plastic/Polymer Blend |
🔍 Key Reminder:
- Chapter 40 is generally preferred for pure polysulfide elastomers as they are chemically classified as synthetic rubbers. - Chapter 39 applies if the product is explicitly defined as a "polysulfide plastic" or polymer in primary forms, or if it contains significant non-rubber polymers that shift its nature. - Misclassification Risk: Declaring a polysulfide elastomer as a generic "plastic" (3926...) may lead to lower duties in some contexts but carries a high risk of customs rejection if the material does not meet the legal definition of "plastic" under HTSUS.
💰 III. 2026 Latest Tariff Rate Breakdown (Including Surcharges & Policy Add-ons)
✅ Applicable Country: United States (US)
✅ Country of Origin: China (CN)
✅ Effective Date: From November 10, 2025 (for subsequent imports)
🎯 1. 4002.99.00.00 —— Other Synthetic Rubber (Polysulfide Elastomer)
| Item | Content |
|---|---|
| Basic Tariff | 0.0% (ad valorem) |
| Section 301 Surcharge | +25.0% (USITC Footnote 9903.88.01) |
| IEEPA Surcharge | +10.0% (Targeting China/HK products, effective Nov 10, 2025) |
| Total Tax Rate | 35.0% |
| Tax Calculation | CIF Value × 35% |
| De Minimis Eligibility | ❌ No (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:4002.99.00.00 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- The 25% Section 301 tariff is applied to most synthetic rubber products from China; - The 10% IEEPA tariff is an additional layer targeting Chinese imports; - Total 35%: This is a high tariff rate. Accurate declaration as "Polysulfide Elastomer" under Chapter 40 is crucial to avoid being misclassified under penalizing categories.
🎯 2. 4002.80.00.00 —— Other Synthetic Rubber from Oils
| Item | Content |
|---|---|
| Basic Tariff | 0.0% |
| Section 301 Surcharge | +25.0% |
| IEEPA Surcharge | +10.0% |
| Total Tax Rate | 35.0% |
| Tax Calculation | CIF × 35% |
| De Minimis Eligibility | ❌ No |
| Legal Basis Path | IEEPA:9901.25 → IEEPA:9903.01.24 → USITC:4002.80.00.00 → FOOTNOTE:9903.88.01 |
📌 Note:
- Similar to4002.99.00.00, this code applies to polysulfide elastomers derived from oil-based synthetic processes. - The tariff burden is identical. Ensure the "oil-based" characteristic is documented if using this code.
🎯 3. 3911.90.10.00 —— Other Polysulfides (Polymer Form)
| Item | Content |
|---|---|
| Basic Tariff | 0.0% |
| Section 301 Surcharge | +25.0% |
| IEEPA Surcharge | +10.0% |
| Total Tax Rate | 35.0% |
| Tax Calculation | CIF × 35% |
| De Minimis Eligibility | ❌ No |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:3911.90.10.00 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- If the product is classified as a polysulfide polymer rather than rubber, it falls here. - The material name "Polysulfide" matches the classification explanation exactly. - Warning: If it is actually a rubber elastomer, misclassifying it as a polymer (3911) may lead to customs disputes, even if the tax rate is the same.
🎯 4. 3911.10.00.00 —— Polysulfides (Primary Forms)
| Item | Content |
|---|---|
| Basic Tariff | 6.1% |
| Section 301 Surcharge | +25.0% |
| IEEPA Surcharge | +10.0% |
| Total Tax Rate | 41.1% |
| Tax Calculation | CIF × 41.1% |
| De Minimis Eligibility | ❌ No |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:3911.10.00.00 → FOOTNOTE:9903.88.01 |
📌 Note:
- This code has a higher base tariff (6.1%) compared to Chapter 40 or other 3911 subheadings. - Avoid this code unless the product is strictly a primary polysulfide polymer form that does not qualify as a rubber or "other polysulfides."
🎯 5. 3926.90.99.89 —— Other Plastic Articles
| Item | Content |
|---|---|
| Basic Tariff | 5.3% |
| Section 301 Surcharge | +7.5% |
| IEEPA Surcharge | +10.0% |
| Total Tax Rate | 22.8% |
| Tax Calculation | CIF × 22.8% |
| De Minimis Eligibility | ❌ No |
| Legal Basis Path | IEEPA:9901.25 → IEEPA:9903.01.24 → USITC:3926.90.99.89 → FOOTNOTE:9903.88.01 |
📌 Note:
- This code appears to offer a lower total tax rate (22.8%). - However, using this code for "Polysulfide Elastomer" is risky. The classification explanation states "Polysulfide belongs to the polymer category... matches 'plastics' material characteristics." - Risk: If Customs determines the product is a rubber (Chapter 40), you will face penalties, back taxes, and delays. Only use this if the product is definitively a finished plastic article, not a raw elastomer.
🛠️ IV. Customs Clearance Practical Advice (Real-World Pitfall Guide)
✅ 1. Documentation Checklist (Non-negotiable)
| Document | Required | Description |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Must clearly state "Polysulfide Elastomer" or "Polysulfide Polymer," including flame retardant content. |
| ✅ Material Safety Data Sheet (MSDS) | ✔️ | Critical for proving chemical composition and confirming it is not a hazardous chemical beyond standard classifications. |
| ✅ Product Photos (Including Label) | ✔️ | Must show the name, model, and material indication. |
| ✅ Commercial Invoice | ✔️ | Must explicitly declare "Polysulfide Elastomer Flame Retardant" or similar precise description. Avoid vague terms like "Rubber Additive." |
| ✅ Certificate of Origin (CO) | ✔️ | Required for determining origin-based surcharges. |
| ✅ Packing List | ✔️ | Detail net/gross weight. |
✅ 2. Declaration Tips (Key Mantra)
🔥 "Material First, Form Second, Name Precise, Tax Avoids Disaster!"
| Scenario | Correct Declaration | Incorrect Action |
|---|---|---|
| Raw Polysulfide Elastomer (Rubber-like) | 4002.99.00.00 or 4002.80.00.00 |
Misdeclaring as "Plastic" (3926) → Risk of penalty |
| Polysulfide Polymer (Chemical Raw Material) | 3911.90.10.00 |
Misdeclaring as "Rubber" → Dispute if not elastomeric |
| Finished Plastic Part with Polysulfide | 3926.90.99.89 |
Using this for raw rubber → 22.8% vs 35% Risk |
| Primary Polysulfide Form | 3911.10.00.00 |
Using this if it’s an elastomer → 41.1% Higher Cost |
✅ 3. Special Case Handling
| Situation | Handling Advice |
|---|---|
| Flame Retardant Additive | Clearly state the % of flame retardant. If the additive does not change the base material’s classification, declare based on the base material (Polysulfide). |
| OEM Custom Formulation | Provide technical data sheets to prove if the product is more "rubber-like" (elastomeric) or "plastic-like" (rigid polymer). |
| Mixed Packaging | If shipped with other items, ensure the invoice separates the polysulfide content clearly. |
| US Origin vs China Origin | If sourced from Vietnam/Mexico, check for IEEPA exemptions. For China, the 35% rate is likely unavoidable for Chapter 40/3911. |
🌍 V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Certification | Note |
|---|---|---|---|---|
| 🇺🇸 USA | 4002.99.00.00 |
35% | No special certs | High tariff due to 301 + IEEPA |
| 🇨🇳 China | 4002.99.00.00 |
~5-8% | RoHS | No surcharges |
| 🇪🇺 EU | 4002.99.00 |
0-6.5% | REACH | No IEEPA |
| 🇦🇺 Australia | 4002.99.00 |
5% | GMP | No surcharges |
| 🇯🇵 Japan | 4002.99.00 |
0-5% | JIS | No surcharges |
📌 Conclusion:
- The USA imposes the highest burden on polysulfide elastomers from China (35%). - EU, Australia, and Japan are significantly more favorable. - For the US market, accurate classification is critical to avoid paying 41.1% (3911.10) or facing penalties for misclassification.
📌 VI. Common Mistakes & Pitfalls (Blood-Teaching Lessons)
❌ Mistake 1: Using "Polysulfide Rubber" description but declaring under 3926 (Plastic) to save taxes.
👉 Consequence: Customs audit finds it’s an elastomer → Back taxes + Penalty.
❌ Mistake 2: Declaring as "Flame Retardant" without specifying the base material.
👉 Consequence: Customs rejects for vagueness → Delay & Return.
❌ Mistake 3: Using 3911.10.00.00 without verifying if it’s a "primary form" polymer.
👉 Consequence: Paying 41.1% instead of 35%.
❌ Mistake 4: Ignoring the "IEEPA 10%" surcharge in cost calculations.
👉 Consequence: Underquoting landed cost by 10% → Profit Loss.
✅ Correct Action:
"Polysulfide Elastomer, Flame Retardant Grade, Synthetic Rubber, HS 4002.99.00.00, Made in China"
🎯 VII. Conclusion: Precise Classification Saves Money!
🎯 Remember the Mantra:
🔹 "Elastomer is Rubber (Ch 40), Polymer is Plastic (Ch 39). Don't Mix Them Up!"
🔹 "35% is the Standard for China-US; 41.1% is the Penalty for Wrong Subheading."
🔹 "Flame Retardant is an Additive, Not a Class Changer."
📌 Pro Tip:
If your polysulfide elastomer is originally from Vietnam, Mexico, or Thailand, you may qualify for IEEPA Exemptions, reducing the rate to 0-5%.
Consider applying for an Advance Ruling from US Customs and Border Protection (CBP) to secure your HS code classification before shipping.
📣 Immediate Action:
📞 Contact a professional customs broker + Provide Product Specs + Apply for HS Code Advance Ruling
🚀 Let your Polysulfide Elastomer clear customs smoothly, efficiently, and profitably!
✨ Professional Clearance Starts with Precise Classification!
💼 Every cent of cost deserves to be calculated accurately!
Customer Reviews
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.