橡胶促进剂 CZ 粉
CN → USAI Analysis
🧪 Rubber Accelerator CZ Powder (CBS / N-Cyclohexyl-2-benzothiazolesulfenamide)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Logistics Strategy
📌 1. Product Definition & Classification: What is "Accelerator CZ"?
Rubber Accelerator CZ (also known as CBS or N-Cyclohexyl-2-benzothiazolesulfenamide) is a primary sulfur vulcanization accelerator used extensively in the rubber industry. It is characterized by: * Slow initial speed: Prevents scorching (premature vulcanization) during processing. * Fast final curing: Ensures efficient cross-linking at high temperatures. * Form: Typically supplied as a fine, off-white to pale yellow powder.
In international trade, it is classified under Chapter 29 (Organic Chemicals) because it is a distinct chemical compound, not a mixed rubber formulation. It is NOT classified as a "rubber" or "finished good" but as a chemical intermediate.
⚠️ Critical Distinction:
- If it is a pure chemical compound (CBS) → HS Code 2930.90
- If it is a pre-mixed rubber compound containing the accelerator → HS Code 4005 (But "CZ Powder" usually implies the pure chemical)
- Do NOT classify under Chapter 38 (Miscellaneous Chemical Products) unless it is a prepared product for non-rubber uses.
📦 2. HS Code Classification Matrix (2026 Latest Tariff Reference)
| HS Code | Product Description | Application | Purity/State |
|---|---|---|---|
2930.90.89.00 |
Other organic sulfur compounds (Most common for CBS/CZ) | Pure Rubber Accelerator CZ Powder | ✅ Pure Chemical |
2930.90.80.00 |
Other organic sulfur compounds (Generic) | General industrial sulfur chemicals | ✅ Pure Chemical |
4005.10.00.00 |
Unvulcanized rubber compounds | Pre-mixed rubber batches (Contains CZ) | ❌ Mixture |
3824.99.99.00 |
Other prepared binders/preparations | Non-rubber industrial additives | ❌ Misclassification Risk |
🔍 Key Insight:
- CBS/CZ is an organic sulfur compound.
- The most accurate 10-digit HS code for import into the US/EU/China is typically2930.90.89.00(Other) or2930.90.80.00(Other).
- Never classify as "Rubber" (Chapter 40) unless it is already mixed with rubber polymers.
💰 3. 2026 Latest Tariff Rate Details (Including Surtaxes & Policy Add-ons)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Date: November 10, 2025 onwards (Post-2025 Tariff Updates)
🎯 1. 2930.90.89.00 —— Organic Sulfur Compounds (Pure CBS/CZ Powder)
| Item | Details |
|---|---|
| Base Rate (MFN) | 0% (Most Favored Nation) |
| USITC Section 301 Surtax | +25% (List 4C / Footnote 9903.88.01 applies to many chemicals) |
| IEEPA Surcharge | +10% (China/Origin-specific, effective from Nov 2025) |
| Total Effective Rate | 35% |
| Tax Calculation | CIF Value × 35% |
| De Minimis Exemption | ❌ Not Eligible (Deny de minimis for chemical surtaxes) |
| Legal Pathway | IEEPA:9903.01.25 → USITC:2930.90.89.00 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- Base Rate 0%: Many organic chemicals enjoy low MFN rates.
- Section 301 (+25%): Chemicals often fall under broader manufacturing/equipment lists. Verify if CBS is specifically excluded (usually not excluded).
- IEEPA (+10%): New 2025 policy for Chinese-origin chemicals.
- Total 35% is significant for bulk chemical imports. Cost optimization is critical.
🎯 2. 2930.90.80.00 —— Generic Organic Sulfur Compounds
| Item | Details |
|---|---|
| Base Rate | 0% |
| USITC Surtax | +25% |
| IEEPA Surcharge | +10% |
| Total Effective Rate | 35% |
| De Minimis Exemption | ❌ Not Eligible |
📌 Note:
- Rates are identical to2930.90.89.00.
- Ensure your CAS Number (99-77-8) is clearly stated in documents to prove it is CBS/CZ.
🛠️ 4. Customs Clearance Practical Advice (Pitfall Avoidance Guide)
✅ 1. Required Documentation Checklist
| Document | Must Provide? | Notes |
|---|---|---|
| ✅ Certificate of Analysis (COA) | ✔️ | Must show CAS No. 99-77-8, Purity ≥ 98%, Moisture ≤ 1% |
| ✅ Material Safety Data Sheet (MSDS/SDS) | ✔️ | Critical for hazardous goods classification (Usually Non-Hazardous for transport, but check local regs) |
| ✅ Commercial Invoice | ✔️ | Must state: "Rubber Accelerator, N-Cyclohexyl-2-benzothiazolesulfenamide (CBS), CAS 99-77-8, Pure Powder" |
| ✅ Packing List | ✔️ | Net weight, Gross weight, Number of bags |
| ✅ Free Sale Certificate | ✔️ | Sometimes required for chemical imports |
| ✅ Origin Certificate (CO) | ✔️ | To claim any preferential rates (if applicable to non-China origins) |
✅ 2. Declaration Tips (Key Mantra)
🔥 “CAS Number is King, ‘Pure’ is Queen, ‘Rubber’ is the Trap!”
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Pure CZ Powder | 2930.90.89.00 - "Organic Sulfur Compound, CAS 99-77-8" |
"Rubber Chemical" → Vague, leads to audit |
| Mixed Rubber Compound | 4005.10.00.00 - "Unvulcanized Rubber Compound" |
"Accelerator CZ" → Wrong chapter |
| Used for Tires | 2930.90.89.00 |
"Tire Accessory" → Wrong classification |
| Small Sample (Under $800) | ❌ Still 35% Tax | "De Minimis Exemption" → DENIED for surtaxed goods |
✅ 3. Special Handling Cases
| Situation | Recommendation |
|---|---|
| Hazmat Classification | CBS/CZ is generally not classified as hazardous for air/sea freight (UN Number may not apply), but SDS must confirm Non-Hazardous. |
| Re-imports | If originally exported and re-imported, provide proof of prior export to claim duty drawback. |
| Chinese Origin vs. Third Country | If manufactured in Vietnam/India, provide Certificate of Origin to avoid Section 301 (+25%) and IEEPA (+10%) surcharges. Tariff can drop to 0-5%. |
| Bulk vs. Bagged | Tariff is the same, but ensure packaging is suitable for hazardous/chemical transport if required by carrier. |
🌍 5. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Certification | Notes |
|---|---|---|---|---|
| 🇺🇸 USA | 2930.90.89.00 |
35% (0% Base + 25% Surtax + 10% IEEPA) | None | High surtax, consider third-country sourcing |
| 🇨🇳 China | 2930.90.89.00 |
5% | None | Low import duty for domestic production |
| 🇪🇺 EU | 2930.90.89.00 |
0% | REACH Registration Required | REACH compliance is mandatory for EU import |
| 🇮🇳 India | 2930.90.90.00 |
7.5% | BIS Certification | Anti-dumping duties may apply; check latest notifications |
| 🇦🇺 Australia | 2930.90.89.00 |
5% | AICIS Approval | Australian Industrial Chemicals Introduction Scheme |
📌 Conclusion:
- USA has the highest effective tariff due to trade war surtaxes.
- EU requires REACH registration (costly and time-consuming).
- Sourcing from Vietnam/India can save ~35% in US duties, but verify Rules of Origin strictly.
📌 6. Common Errors & Pitfalls (Lessons Learned)
❌ Error 1: Declaring as "Rubber Accelerator" without CAS Number
👉 Consequence: Customs may classify under generic chemical headings, leading to delayed clearance or higher duties if misclassified.
❌ Error 2: Claiming De Minimis ($800) for small shipments
👉 Consequence: Seizure or Tax Collection. Chemicals subject to Section 301/IEEPA are explicitly excluded from de minimis.
❌ Error 3: Misclassifying as "Rubber Product" (Chapter 40)
👉 Consequence: If declared as "Rubber," it might attract 20%+ duties + anti-dumping investigations. Pure chemicals are Chapter 29.
❌ Error 4: Ignoring REACH for EU shipments
👉 Consequence: Goods blocked at EU border. REACH registration must be completed by the importer or supplier.
✅ Correct Practice:
"Rubber Accelerator, N-Cyclohexyl-2-benzothiazolesulfenamide (CBS), CAS 99-77-8, Purity 98%, Powder, HS 2930.90.89.00"
🎯 7. Conclusion: Precise Classification Saves Money!
🎯 Remember the Mantra:
🔹 “CAS 99-77-8 is the ID, Chapter 29 is the Home, 35% Tax is the Cost, REACH is the Gate.”
🔹 “Don’t say ‘Rubber’, say ‘Chemical’. Don’t say ‘Sample’, say ‘Shipment’.”
📌 Pro Tip:
If you are shipping to the US, consider:
1. Sourcing from Non-China Origins (Vietnam, India) to avoid 35% surtax.
2. Applying for an Advance Ruling with US CBP to confirm HS Code 2930.90.89.00 is correct for your specific batch.
3. Ensuring REACH Compliance if shipping to Europe.
📣 Immediate Action:
📞 Contact your freight forwarder with CAS No. 99-77-8 and MSDS.
🚀 Accurate classification = Lower costs = Faster clearance.
✨ Professional Customs Clearance Starts with Precise Classification!
💼 Every dollar saved on duties is pure profit!
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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.