Rubber Auxiliary ZMBT (Powder)
CN → USAI Analysis
🛡️ Rubber Auxiliary: ZMBT (Zinc 2-Mercaptobenzothiazole) – Powder Form
🌐 HS Code Reference & Clearance Guide | 2026 Latest Tariff Full Analysis | Professional Leveling Strategy
📌 1. Product Definition & Classification: Do You Really Understand “ZMBT Powder”?
ZMBT (Zinc 2-Mercaptobenzothiazole) is a widely used rubber vulcanization accelerator in the manufacturing of tires, rubber hoses, belts, and industrial rubber products. It acts as an autocatalyst, enhancing the efficiency of other accelerators and improving cross-linking density.
In international trade, ZMBT is classified based on its chemical form and application:
ZMBT (Zinc Salt):
- Powder Form: The most common commercial form, used directly in rubber compounding.
- Solid/Granular Form: Less common, sometimes used for specific handling requirements.
⚠️ Key Distinction:
- If the product is pure ZMBT powder (no mixtures with other chemicals for specific formulations) → Classified under 2930.90.60.00.
- If the product is a pre-mixed rubber compounding aid (e.g., ZMBT + stearic acid + silica) → May be classified under 3824.99.90.00 (Prepared binders for foundry molds or cores; chemical products and preparations of the chemical or allied industries, not elsewhere specified or included).🔍 Critical Note:
- Pure chemical substances are always preferred to be classified under Chapter 29 (Organic Chemicals).
- Mixtures or preparations are classified under Chapter 38.
📦 2. HS Code Classification Details (2026 Latest Tariff Authoritative Comparison)
| HS Code | Product Description | Application Scenario | Is it a Pure Chemical? |
|---|---|---|---|
2930.90.60.00 |
Zinc 2-mercaptobenzothiazole (ZMBT), pure | Direct use in rubber compounding | ✅ Yes |
3824.99.90.00 |
Prepared rubber compounding aids (ZMBT mixtures) | Pre-mixed rubber additives | ❌ No |
🔍 Key Reminder:
- Pure ZMBT powder must be classified under 2930.90.60.00, not under 3824.99.90.00.
- If the product is a mixture (e.g., ZMBT + other accelerators), it falls under 3824.99.90.00.
💰 3. 2026 Latest Tariff Rate Details (Including Surtaxes, Policy Surcharges)
✅ Applicable Country: United States (US)
✅ Country of Origin: China (CN)
✅ Effective Date: From November 10, 2025 (including subsequent imports)
🎯 1. 2930.90.60.00 – Zinc 2-mercaptobenzothiazole (ZMBT), Pure
| Item | Content |
|---|---|
| Base Tariff Rate | 5.7% (ad valorem) |
| USITC Surtax | +25% (from USITC Footnote 9903.01.25) |
| IEEPA Surtax | +10% (for China/HK products, from November 10, 2025) |
| Total Tariff Rate | 40.7% |
| Tax Calculation | CIF Value × 40.7% |
| De Minimis Exemption Available? | ❌ No (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:2930.90.60.00 → FOOTNOTE:9903.01.25 |
📌 Explanation:
- “USITC surtax 25%” comes from the “Additional Tariffs” under Section 301 of the U.S. Trade Act.
- “IEEPA 10%” is the surtax imposed on Chinese products under the International Emergency Economic Powers Act.
- Total 40.7%, which is a very high tariff. Must be anticipated in advance!
🎯 2. 3824.99.90.00 – Prepared Rubber Compounding Aids (ZMBT Mixtures)
| Item | Content |
|---|---|
| Base Tariff Rate | 5.7% (ad valorem) |
| USITC Surtax | +25% (from USITC Footnote 9903.01.25) |
| IEEPA Surtax | +10% (for China/HK products, from November 10, 2025) |
| Total Tariff Rate | 40.7% |
| Tax Calculation | CIF Value × 40.7% |
| De Minimis Exemption Available? | ❌ No (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:3824.99.90.00 → FOOTNOTE:9903.01.25 |
📌 Note:
- Both pure ZMBT and mixtures are subject to the same high tariffs.
- Even if the product is a “pre-mixed” rubber additive, it is still subject to the 40.7% total tariff.
🛠️ 4. Customs Clearance Practical Advice (Practical Pitfall Avoidance Guide)
✅ 1. Preparation List (All Items Are Mandatory)
| Material | Must Provide | Description |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Includes chemical structure, purity, particle size, melting point |
| ✅ MSDS (Material Safety Data Sheet) | ✔️ | For chemical safety and handling instructions |
| ✅ Product Photos (Including Label) | ✔️ | Clear display of model, brand, chemical composition |
| ✅ Third-Party Test Report | ✔️ | ISO, REACH, RoHS, FDA (if applicable) |
| ✅ Commercial Invoice | ✔️ | Clearly mark “ZMBT Powder for Rubber Vulcanization” |
| ✅ Certificate of Origin (CO) | ✔️ | If not from China, can apply for preferential tariffs |
| ✅ Packing List | ✔️ | Describe the relationship between main goods and accessories, avoid split declaration |
✅ 2. Declaration Skills (Key Mnemonics)
🔥 “Pure Chemicals in Chapter 29, Mixtures in Chapter 38, Name Precision, Tariff Halved!”
| Situation | Correct Declaration Method | Incorrect Practice |
|---|---|---|
| Pure ZMBT Powder | 2930.90.60.00 |
Misreported as “Rubber Additive” → 40.7% |
| ZMBT + Stearic Acid Mixture | 3824.99.90.00 |
Misreported as “Pure Chemical” → 40.7% |
| Rubber Compounding Aid (Pre-mixed) | 3824.99.90.00 |
Misreported as “Pure Chemical” → 40.7% |
| Other Rubber Chemicals (e.g., Sulfur) | 2802.00.00.00 |
Misreported as “ZMBT” → 5.7% |
✅ 3. Special Case Handling
| Situation | Handling Advice |
|---|---|
| OEM Custom ZMBT | Provide customer order + design drawings, avoid being deemed “non-standard” |
| ZMBT for Medical Use | If for special medical applications, apply for “non-commercial use” exemption, but需提供 proof |
| ZMBT for Military/Aerospace | Can apply for “special purpose” declaration, tariffs may be reduced, need to communicate in advance |
🌍 5. Global Major Market Clearance Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification Requirements | Remarks |
|---|---|---|---|---|
| 🇺🇸 United States | 2930.90.60.00 |
40.7% (China Origin) | REACH, RoHS | High tariff for China-origin products |
| 🇨🇳 China | 2930.90.60.00 |
5.7% | No additional surtax | No surtax |
| 🇪🇺 European Union | 2930.90.60.00 |
6.5% | REACH, RoHS | No surtax |
| 🇦🇺 Australia | 2930.90.60.00 |
5% | RCM | No surtax |
| 🇯🇵 Japan | 2930.90.60.00 |
0% | PSE | No surtax |
📌 Conclusion:
- The United States imposes high surtaxes on ZMBT from China.
- China-origin ZMBT has extremely high clearance costs in the U.S. It is recommended to evaluate in advance whether to transfer production or adjust the supply chain.
📌 6. Common Mistakes & Pitfall Avoidance Guide (Blood and Tears Lessons)
❌ Mistake 1: Declaring “Pure ZMBT” as “Rubber Additive”
👉 Consequence: Tariff from 40.7% to 40.7% → No difference, but risk of misclassification!
❌ Mistake 2: Declaring “Mixture” as “Pure Chemical”
👉 Consequence: Tariff remains 40.7% → Risk of penalty and tax refund!
❌ Mistake 3: No MSDS Provided, Only Written “ZMBT”
👉 Consequence: Customs cannot determine purity → Delay in release or return!
❌ Mistake 4: Using “Rubber Accelerator” or “ZMBT Powder” as Declaration Name
👉 Consequence: If actual product is a mixture, misclassification → Tax refund and penalty!
✅ Correct Practice:
“ZMBT Powder, Zinc 2-Mercaptobenzothiazole, Purity ≥98%, for Rubber Vulcanization, Model XYZ, REACH & RoHS Certified”
🎯 7. Conclusion: Professional Declaration, Save Time and Effort, Reduce Costs and Increase Efficiency!
🎯 Remember Mnemonics:
🔹 “Pure Chemicals in Chapter 29, Mixtures in Chapter 38, Name Precision, Tariff Halved!”
🔹 “HS Code determines life and death, tariff difference of 35 points, declaration difference in one step, tax refund of tens of thousands of dollars!”
📌 Tips:
If your ZMBT originates from Vietnam, Mexico, Thailand, or Malaysia, you can apply for IEEPA exemption, and the tariff is only 0%~5%.
It is recommended to apply for advance ruling (Advance Ruling) in advance to avoid clearance risks.
📣 Immediate Action:
📞 Contact a professional customs broker + Provide product pictures + Apply for HS Code advance ruling
🚀 Let your ZMBT powder pass smoothly, export efficiently, and double profits!
✨ Professional Clearance, Starting from Accurate Classification!
💼 Every cent of your cost is worth being calculated precisely!
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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.