Rubber Auxiliary Agent ZMBT (Ointment)
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βοΈ Rubber Auxiliary Agent: ZMBT (Zinc 2-Mercaptobenzothiazole)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Leveling Strategy
π I. Product Definition & Classification: Do You Really Understand "ZMBT"?
ZMBT (Zinc 2-Mercaptobenzothiazole) is a critical auxiliary agent in the rubber industry, widely used as an accelerator and anti-ozonant. It enhances the vulcanization speed, improves scorch safety, and prevents ozone cracking. In international trade, it is often referred to as "Zinc Ointment" or "ZMBT Paste," but its chemical nature dictates its classification under specific HS codes.
Key Distinction: * Chemical Compound (Pure): If the product is pure Zinc 2-Mercaptobenzothiazole (powder/crystals), it falls under 2930.90. * Prepared Rubber Auxiliary (Mixture/Ointment): If the product is a pre-mixed paste, "ointment," or preparation containing ZMBT mixed with other substances (like zinc oxide, stearic acid, or carriers) specifically for rubber processing, it is classified under 3824.99 or 3824.60 depending on composition. Note: In many customs jurisdictions, if the primary function is as a rubber accelerator and it is not a "preparation" under Chapter 29, it may still fall under 3824.
β οΈ Critical Classification Point:
- If labeled as "ZMBT" and is a pure chemical substance β 2930.90 (Sulfonated derivatives; Other).
- If labeled as "ZMBT Ointment/Paste" or "Prepared Accelerator" β 3824.99 (Prepared binders for foundry molds/cores; Other chemical products and preparations, not elsewhere specified or included).
- Customs often treats "Rubber Accelerators" as preparations under 3824.99.99 or specific national sub-codes.
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Application Scenario | Purity/Form |
|---|---|---|---|
2930.90.90.00 |
Other organic sulfur compounds (Pure ZMBT powder) | Pure chemical raw material, sold to chemical blenders | β Pure Chemical |
3824.99.99.00 |
Prepared rubber accelerators/auxiliaries (ZMBT Ointment/Paste) | Pre-mixed rubber additives, ZMBT paste for direct rubber mixing | β Prepared Mixture |
3824.60.00.00 |
Non-refractory mortar, concrete, etc. (Not applicable) | N/A | β N/A |
2935.00.00.00 |
Antibiotics (Not applicable) | N/A | β N/A |
3824.90.80.00 |
Other prepared binders for foundry molds | Foundry applications (if used in metal casting) | β Specialized Use |
π Key Reminder:
- "Ointment" implies a mixture with a carrier. Customs authorities may classify this under 3824.99.99.00 (Other chemical products) rather than 2930.
- If the product is 100% ZMBT powder, use 2930.90.90.00.
- If the product is ZMBT mixed with zinc oxide/stearic acid (common in "ZMBT Ointment"), it is a prepared preparation β 3824.99.99.00.
- Misclassification Risk: Declaring a mixture as a pure chemical (2930) can lead to rejection or fines. Declare accurately based on composition.
π° III. 2026 Latest Tariff Rate Details (Including Surcharges & Policy Additions)
β Applicable Country: United States (US)
β Country of Origin: China (CN)
β Effective Date: November 10, 2025 (and subsequent imports)
π― 1. 2930.90.90.00 ββ Organic Sulfur Compounds (Pure ZMBT)
| Item | Content |
|---|---|
| Base Rate | 5.3% (ad valorem) |
| USITC Supplementary Tax | +25% (from USITC Footnote 9903.88.01, Section 301) |
| IEEPA Supplementary Tax | +10% (for China/HK products, from Nov 10, 2025) |
| Total Tax Rate | 40.3% |
| Tax Calculation | CIF Value Γ 40.3% |
| De Minimis Exemption | β Not Eligible (deny_de_minimis) |
| Legal Path | IEEPA:9903.01.25 β IEEPA:9903.01.24 β USITC:2930.90.90.00 β FOOTNOTE:9903.88.01 |
π Explanation:
- "25% USITC tax" is from Section 301 of the Trade Act;
- "10% IEEPA tax" is the newε―Ήε additional tariff effective Nov 2025;
- Total 40.3% is a high tariff, requiring advance planning!
π― 2. 3824.99.99.00 ββ Prepared Rubber Accelerators (ZMBT Ointment)
| Item | Content |
|---|---|
| Base Rate | 5.6% (ad valorem) |
| USITC Supplementary Tax | +25% (from USITC Footnote 9903.88.01, Section 301) |
| IEEPA Supplementary Tax | +10% (for China/HK products, from Nov 10, 2025) |
| Total Tax Rate | 40.6% |
| Tax Calculation | CIF Value Γ 40.6% |
| De Minimis Exemption | β Not Eligible (deny_de_minimis) |
| Legal Path | IEEPA:9901.25 β IEEPA:9903.01.24 β USITC:3824.99.99.00 β FOOTNOTE:9903.88.01 |
π Note:
- Both pure ZMBT and ZMBT ointment are subject to high tariffs;
- Even if labeled "Ointment," if it contains >50% ZMBT, it may still be scrutinized as a chemical product;
- If mixed with non-restricted carriers, the tariff remains 40.6% for China-origin goods.
π οΈ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Avoidance Guide)
β 1. Required Documentation Checklist (All Mandatory)
| Document | Must Provide | Description |
|---|---|---|
| β Product Specification Sheet | βοΈ | Include chemical formula (C7H5N2S2Zn), purity, CAS No. (135-93-1) |
| β Formula/Composition Analysis | βοΈ | Critical for distinguishing between 2930 (pure) and 3824 (mixture) |
| β Product Photos (Including Label) | βοΈ | Clear view of "ZMBT," "Ointment," "Rubber Accelerator" |
| β Safety Data Sheet (SDS) | βοΈ | Must comply with GHS standards; note flammability/irritancy |
| β Commercial Invoice | βοΈ | Clearly state "ZMBT Rubber Accelerator" or "ZMBT Paste" |
| β Certificate of Origin (CO) | βοΈ | If non-China origin, request preferential tariff |
| β Packing List | βοΈ | Detail net/gross weight, avoid splitting declaration if possible |
β 2. Declaration Tips (Key Mantra)
π₯ "Pure vs. Mixture, Declare Composition, Name Accurately, Tax Down Half!"
| Situation | Correct Declaration Method | Incorrect Practice |
|---|---|---|
| Pure ZMBT Powder | 2930.90.90.00 |
Misdeclare as "Ointment" β 40.6% |
| ZMBT Paste/Ointment | 3824.99.99.00 |
Misdeclare as "Pure Chemical" β 40.3% |
| ZMBT with Other Chemicals | 3824.99.99.00 |
Split declaration β 89.5% per item |
| Used in Foundry (Not Rubber) | 3824.90.80.00 |
Misdeclare as rubber accelerator β 32% |
β 3. Special Case Handling
| Situation | Handling Advice |
|---|---|
| OEM Custom ZMBT Paste | Provide customer order + formula to avoid "non-standard" labeling |
| ZMBT Used in Medical Devices | If used as anti-ozonant in medical rubber, provide proof; may still fall under 3824 |
| ZMBT for Military/Aerospace | Apply for "Special Use" declaration; may qualify for reduced tariff with pre-approval |
| ZMBT Mixed with Non-Chemical Fillers | If >50% filler by weight, may still be 3824; declare composition clearly |
π V. Global Major Market Customs Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification Requirement | Notes |
|---|---|---|---|---|
| πΊπΈ United States | 3824.99.99.00 |
40.6% (China Origin) | SDS + TSCA Compliance | High tariff, strict origin check |
| π¨π³ China | 2930.90.90.00 / 3824.99.99.00 |
5-6% | REACH (if exported to EU) | No additional surcharges |
| πͺπΊ European Union | 3824.99.99.00 |
0% (if REACH compliant) | REACH Registration | No surcharges |
| π¦πΊ Australia | 3824.99.99.00 |
5% | RCM | No surcharges |
| π―π΅ Japan | 3824.99.99.00 |
0% | JIS/PSE | No surcharges |
π Conclusion:
- US is the only market imposing high additional tariffs on ZMBT;
- China-origin ZMBT has high clearance costs in the US; consider supply chain adjustment or pre-clearance ruling.
π VI. Common Errors & Pitfall Avoidance Guide (Blood-and-Tears Lessons)
β Error 1: Declaring "ZMBT Ointment" as "Pure Chemical"
π Consequence: Customs may reject for misclassification β 40.3% vs. 40.6% (minor diff, but risk of audit)
β Error 2: Not providing Composition Analysis
π Consequence: Customs cannot determine if itβs 2930 or 3824 β Delay or Return
β Error 3: Splitting ZMBT Powder and Carriers into Separate Shipments
π Consequence: Each item taxed at 89.5% β Total tax > 268%!
β Error 4: Using "Rubber Accelerator" as Generic Name
π Consequence: If specific composition not provided, Customs may apply highest duty β 32%+
β Correct Practice:
"ZMBT Rubber Accelerator Paste (Zinc 2-Mercaptobenzothiazole + Carrier), CAS 135-93-1, Purity 99%, for Tire Manufacturing"
π― VII. Conclusion: Precise Declaration, Save Time, Reduce Costs!
π― Remember the Mantra:
πΉ "Pure vs. Mixture, Declare Composition, Name Accurately, Tax Down Half!"
πΉ "HS Code Determines Life, Tax Diff 25%, Declare Wrong, Pay Thousands!"
π Pro Tip:
If your ZMBT is originated from Vietnam, Mexico, Thailand, or Malaysia, you may apply for IEEPA Exemption, reducing tariff to 0%-5%;
Advise Advance Ruling (Advance Ruling) application to avoid clearance risks.
π£ Take Action Now:
π Contact Professional Broker + Provide Product Specs + Apply for HS Code Advance Ruling
π Let Your ZMBT Clear Customs Smoothly, Boost Profits, and Export Efficiently!
β¨ Professional Clearance Starts with Precise Classification!
πΌ Every Cent of Your Cost Deserves Precise Calculation!
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) β Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) β More specific grouping within the chapter
- Subheading (6 digits) β Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) β 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 β The standard duty rate applied to WTO members
- General rate β Applied to countries without trade agreements
- Trade remedy duties β 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.