橡胶助剂zmbt粉状
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🧪 Rubber Chemicals: ZMBT Powder (Zinc 2-Mercaptobenzothiazole)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
📌 I. Product Definition & Classification: What is "ZMBT"?
ZMBT stands for Zinc 2-Mercaptobenzothiazole (also known as Zinc Dibenzothiazyl Disulfide). It is a secondary accelerator used in the vulcanization of natural and synthetic rubbers. Unlike Zinc Stearate (which is often a simple stearate salt), ZMBT is a complex coordination compound where zinc is chelated with 2-mercaptobenzothiazole.
In international trade, it is critical to distinguish between: 1. Raw Chemical Intermediate: Pure ZMBT powder used as an additive. 2. Formulated Compound: Pre-mixed rubber additives containing ZMBT.
⚠️ Key Distinction Point:
- If the product is pure ZMBT powder (chemical compound) → It is classified under Chapter 29 (Organic Chemicals).
- If it is a pre-mixed rubber accelerator compound with other fillers or additives → It may fall under HS 3824 (Prepared Binders/Industrial Chemicals).
- Crucial: Pure ZMBT is NOT Zinc Stearate (HS 3822) nor 2-Mercaptobenzothiazole itself (HS 2934). It is a specific zinc complex.
📦 II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Applicable Scenario | Chemical Structure |
|---|---|---|---|
2934.99.40.00 |
Zinc 2-mercaptobenzothiazole (ZMBT) | Pure ZMBT powder, primary or secondary accelerator for rubber vulcanization | ✅ Yes (Specific subheading for ZMBT) |
2934.99.90.00 |
Other heterocyclic compounds with nitrogen heteroatoms only | Other benzothiazole derivatives not specifically listed | ✅ No (Backup if ZMBT not listed) |
3824.99.92.00 |
Other prepared rubber additives | Pre-mixed compounds containing ZMBT + stearates + fillers | ✅ No (Only for mixtures) |
3822.00.90.00 |
Diagnostic/reagent kits | Lab reagents containing ZMBT | ✅ No (Different usage) |
2933.99.80.00 |
Other nitrogen heterocyclic compounds | Incorrect classification (ZMBT is a sulfur-nitrogen compound) | ❌ Wrong |
🔍 Important Reminder:
- ZMBT has a specific subheading under 2934.99.40. Do NOT misclassify it as "Other organic chemicals" (2934.99.90) unless local customs require it due to specific national adaptations.
- Do not confuse with 2-Mercaptobenzothiazole (MBT) which is the precursor (HS 2934.99.40 in some versions, but often 2934.99.90 depending on the country's 8-10 digit breakdown). ZMBT is the Zinc salt/complex, which is distinct.
- If imported as a mixture (e.g., 50% ZMBT + 50% carrier), it may be classified as 3824.99 (Prepared chemicals).
💰 III. 2026 Latest Tariff Rate Details (Including Surcharges & Policies)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Date: From November 10, 2025 (Including subsequent imports)
🎯 1. 2934.99.40.00 —— Zinc 2-Mercaptobenzothiazole (ZMBT)
| Item | Content |
|---|---|
| Base Tariff Rate | 5.3% (Ad valorem) |
| USITC Additional Tariff (Section 301) | +7.5% (Applicable to most chemical intermediates from China) |
| IEEPA Additional Tariff | +10% (For Chinese/HK products, effective Nov 10, 2025) |
| Total Tariff Rate | 22.8% |
| Tax Calculation | CIF Value × 22.8% |
| De Minimis Exemption Eligible? | ❌ No (deny_de_minimis) |
| Legal Path | IEEPA:9903.01.25 → USITC:2934.99.40.00 → SECTION301:Footnote9903.88.01 |
📌 Explanation:
- Base 5.3%: Standard Most Favored Nation (MFN) rate for organic chemicals.
- Section 301 (7.5%): ZMBT is considered a strategic chemical intermediate for the rubber industry (tires, automotive parts).
- IEEPA (10%): New surcharge on Chinese-origin goods effective late 2025.
- Total 22.8%: This is a moderate-high tariff. It is significantly lower than electronics or consumer goods, but still impacts cost margins.
🎯 2. Alternative: If Misclassified as 3824.99.92.00 (Prepared Rubber Additives)
| Item | Content |
|---|---|
| Base Tariff Rate | 5.3% |
| USITC Additional Tariff | +7.5% |
| IEEPA Additional Tariff | +10% |
| Total Tariff Rate | 22.8% |
| Note | Same rate, but regulatory requirements differ (see below). |
⚠️ Risk Warning:
Misclassification as "Prepared Additive" (3824) when it is pure ZMBT (2934) may trigger anti-dumping duties (AD) or countervailing duties (CVD) if specific investigations are active for rubber additives. Pure ZMBT (2934) is generally NOT subject to AD/CVD, whereas some pre-mixed accelerators might be. Stick to 2934.99.40 for pure powder.
🛠️ IV. Customs Clearance Practical Advice (Pitfall Avoidance Guide)
✅ 1. Document Checklist (Essential)
| Document | Must Provide | Description |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Must state "Zinc 2-Mercaptobenzothiazole (ZMBT)", CAS No. 1206-16-2 |
| ✅ Certificate of Analysis (COA) | ✔️ | Purity > 98%, physical state: Powder, color: Off-white/Yellowish |
| ✅ Structure Diagram | ✔️ | To prove it is ZMBT, not MBT or Zinc Stearate |
| ✅ Safety Data Sheet (SDS) | ✔️ | Critical for Hazmat Declaration. ZMBT is a respiratory irritant. |
| ✅ Commercial Invoice | ✔️ | Clearly state "Pure ZMBT Powder, Not a Mixture" |
| ✅ MSDS for UN3077 | ✔️ | If applicable, it may be classified as an Environmentally Harmful Substance (UN3077) in transport, but not for HS Code classification. |
✅ 2. Declaration Tips (Key Mnemonics)
🔥 “CAS 1206-16-2, Pure ZMBT, Chapter 29, No AD/CVD!”
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Pure ZMBT Powder | 2934.99.40.00 |
Declaring as 3824.99 → Risk of AD/CVD investigation |
| ZMBT + Zinc Stearate Mixture | 3824.99.92.00 |
Declaring as 2934.99 → Incorrect, should be mixture |
| ZMBT Liquid Solution | 2934.99.40.00 (if <50% active) |
Declaring as 3824 → Check concentration |
| Used ZMBT Waste | 3825.49.00.00 |
Declaring as 2934 → Waste has different HS |
✅ 3. Special Handling Instructions
| Situation | Handling Advice |
|---|---|
| Hazmat Transport | ZMBT is not typically classified as Dangerous Goods for air/sea unless in large quantities with specific properties. However, it is a skin/respiratory irritant. SDS must be provided. |
| EPA Registration | ZMBT is a chemical substance under TSCA. Ensure EPA compliance for import. |
| Antidumping/Countervailing | Check carefully: Some rubber accelerators (like TBBS, DPG) have AD/CVD. ZMBT (2934.99.40) currently does NOT have active AD/CVD duties in the US. This is a key cost advantage. |
| Customs Audit | Keep sample receipts and purity reports. Customs may ask for proof it is not a "preparation." |
🌍 V. Global Market Clearance Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Certification Requirements | Notes |
|---|---|---|---|---|
| 🇺🇸 USA | 2934.99.40.00 |
22.8% (Base 5.3% + 7.5% 301% + 10% IEEPA) | TSCA Compliance, FDA (if food contact) | No AD/CVD for ZMBT |
| 🇨🇳 China | 2934.99.40.00 |
0% (Import Duty) | None | Zero Duty for imports into China |
| 🇪🇺 EU | 2934.99.90 (No specific ZMBT subheading) |
6.5% | REACH Registration (High Volume) | REACH is critical in EU |
| 🇯🇵 Japan | 2934.99.10 |
4.1% | Chemical Substance Control Law (CSCL) | Low tariff, strict safety |
| 🇮🇳 India | 2934.99.10 |
7.5% - 10% | BIS Certification (if applicable) | High duty, check anti-dumping |
📌 Conclusion:
- USA: High tariff (22.8%) but no AD/CVD. Cost is predictable.
- China: Zero duty, ideal for raw material sourcing.
- EU/India: Moderate tariffs, but regulatory barriers (REACH, BIS) are higher.
📌 VI. Common Mistakes & Pitfalls (Lessons Learned)
❌ Mistake 1: Confusing ZMBT with Zinc Stearate (HS 3822)
👉 Consequence: Zinc Stearate has different tariffs (often 0% or lower) and no Section 301. Misclassification leads to underpayment and penalties.
❌ Mistake 2: Declaring ZMBT as "Rubber Accelerator Compound" (3824) when it is pure
👉 Consequence: While tariff rate is similar (22.8%), it may trigger anti-dumping investigations if specific compounds are under review. Pure ZMBT is safer under 2934.
❌ Mistake 3: Ignoring CAS Number
👉 Consequence: Customs may reject declaration due to ambiguity. Always include CAS 1206-16-2.
❌ Mistake 4: Not checking TSCA (USA) or REACH (EU) status
👉 Consequence: Goods held at border for regulatory compliance. ZMBT must be registered.
✅ Correct Declaration:
"Zinc 2-Mercaptobenzothiazole (ZMBT), Pure Powder, CAS 1206-16-2, HS 2934.99.40.00, Not a Mixture, For Rubber Vulcanization"
🎯 VII. Conclusion: Professional Classification Saves Money!
🎯 Remember the Mnemonic:
🔹 "CAS 1206-16-2, Chapter 29, Pure ZMBT, No AD/CVD!"
🔹 "HS 2934.99.40 is King, 3824 is Risky, Mixtures Change Everything!"
📌 Pro Tip:
If you are importing ZMBT into the USA, the 22.8% total tariff is significant. Consider:
1. Supply Chain Optimization: Source from non-China countries (e.g., South Korea, India) if possible to avoid Section 301 + IEEPA.
2. Pre-Ruling: Request a CBP Pre-Ruling to confirm 2934.99.40.00 classification and avoid AD/CVD disputes.
3. Contract Clauses: Ensure contracts specify "Pure ZMBT, CAS 1206-16-2" to prevent customs ambiguity.
📣 Immediate Action:
📞 Contact your customs broker + Provide CAS 1206-16-2 + Verify TSCA/REACH status
🚀 Let your ZMBT shipment clear smoothly, avoid penalties, and protect margins!
✨ Professional Clearance, Starting with Accurate Classification!
💼 Every cent of tariff counts in the chemical trade!
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.