Mold Repair Chemical Agent
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3824500050 | 35.0% | CN | US | Official Doc |
| 3824992500 | 41.5% | CN | US | Official Doc |
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π§ͺ Mold Repair Chemical Agent (Foundry Binders & Chemical Mixtures)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
π I. Product Definition & Classification: Do You Really Understand "Mold Repair Chemicals"?
"Mold Repair Chemical Agent" is a broad term in the foundry industry. It generally refers to chemical preparations used to repair molds or cores, or binders used in the casting process. However, in international trade and customs classification, the specific chemical composition determines the HS Code.
Based on the provided data, these products fall into two distinct categories: 1. Prepared Binders: Chemical mixtures specifically designed for foundry molds/cores. 2. Specific Chemical Mixtures: Complex aromatic sulfonium chloride mixtures used in specialized chemical applications.
β οΈ Critical Distinction:
- If the product is a general prepared binder for molds/cores, it is classified under 3824.50.00.50.
- If the product is a specific high-purity chemical mixture containing 5%+ aromatic substances (specifically triphenyl sulfonium chlorides), it is classified under 3824.99.25.00.
- Misclassification Risk: Declaring a specific sulfonium chloride mixture as a generic "binder" (or vice versa) can lead to severe customs penalties due to tariff discrepancies (0% vs. 25%).
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Key Characteristics | Applicable Scenario |
|---|---|---|---|
3824.50.00.50 |
Prepared binders for foundry molds or cores; other chemical products not elsewhere specified; nonrefractory mortars and concretes. | General-purpose binders; mixtures of natural products; non-refractory construction materials. | Standard foundry sand binders, core sand adhesives, generic chemical preparations. |
3824.99.25.00 |
Other; Other; Other; Mixtures containing 5%+ aromatic/modified aromatic substances: Aqueous mixtures of triphenyl sulfonium chloride, diphenyl (4-phenylthio)phenyl sulfonium chloride, and (thiodi-4,1-phenylene)bis(diphenyl sulfonium) dichloride. | Highly specific chemical compounds; >5% aromatic content; Sulfonium chloride derivatives. | Specialized electronic chemicals, photoresist components, or advanced material science applications. |
π Key Reminder:
-3824.50.00.50is the "catch-all" for general prepared binders. If the product is a standard foundry binder, this is likely the correct code.
-3824.99.25.00is extremely specific. It only applies if the product matches the exact chemical composition listed (triphenyl sulfonium chlorides). Do not use this code unless the Chemical Abstracts Service (CAS) numbers match exactly.
π° III. 2026 Latest Tariff Rate Breakdown (Including Surcharge Taxes)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Date: Current trade policies apply (Section 301 Tariffs)
π― 1. 3824.50.00.50 ββ Prepared Binders for Foundry Molds/Cores (General)
| Item | Content |
|---|---|
| Base Tariff Rate | 0.0% (Ad Valorem) |
| Section 301 Surcharge | +25.0% (China-origin specific) |
| Total Effective Tax Rate | 25.0% |
| Tax Calculation | CIF Value Γ 25% |
| De Minimis Exemption | β Not Eligible (Standard Section 301 goods are subject to full duty) |
| Legal Basis Path | HTSUS:3824.50.00.50 β Section 301 Footnote: 9903.01.18 |
π Explanation:
- Although the base duty is 0%, the 25% Section 301 tariff is strictly enforced for Chinese-origin goods in this category.
- This is a high-cost item for importers. The total landed cost must include this 25% duty.
- "Nonrefractory mortars and concretes" also fall under this code if not specified elsewhere.
π― 2. 3824.99.25.00 ββ Specific Aromatic Sulfonium Chloride Mixtures
| Item | Content |
|---|---|
| Base Tariff Rate | 0.0% (Ad Valorem) |
| Section 301 Surcharge | 0.0% (Exempt/Not Listed) |
| Total Effective Tax Rate | 0.0% |
| Tax Calculation | $0 Duty |
| De Minimis Exemption | β Eligible (If value is under $800, no duty applies anyway, but even above, duty is 0%) |
| Legal Basis Path | HTSUS:3824.99.25.00 β Exclusion List Check |
π Critical Advantage:
- This specific chemical mixture is tax-free under current Section 301 lists.
- Why? It is listed as a distinct chemical preparation that may have been excluded or not captured in the broad "301" list for general chemicals.
- Warning: You must prove the exact chemical composition. If Customs determines it is not the specific sulfonium chloride mixture but a generic binder, they will reclassify it to 3824.50.00.50 and charge 25%.
π οΈ IV. Customs Clearance Practical Advice (Avoid Pitfalls)
β 1. Documentation Checklist (Non-Negotiable)
| Document | Required? | Explanation |
|---|---|---|
| β Chemical Composition Statement | βοΈ Mandatory | Must list all ingredients by weight. Specifically prove if it contains the sulfonium chlorides for 3824.99.25.00. |
| β Safety Data Sheet (SDS) | βοΈ Mandatory | Class 9 Dangerous Goods? If yes, special packaging and labeling are required. |
| β Product Specification Sheet | βοΈ Recommended | Show intended use (Foundry Binder vs. Chemical Intermediate). |
| β Commercial Invoice | βοΈ Mandatory | Clearly state "Prepared Binder" or "Sulfonium Chloride Mixture" β never use vague terms like "Repair Agent." |
| β Customs Ruling Letter | βοΈ Highly Recommended | If unsure, obtain a pre-classification ruling from CBP to lock in the 0% rate for 3824.99.25.00. |
β 2. Declaration Tips (Key Mantras)
π₯ "Composition is King, Name is Queen. Vague Names Get 25%!"
| Situation | Correct Declaration | Wrong Practice |
|---|---|---|
| Generic Foundry Binder | "Prepared Binder for Foundry Molds" | "Mold Repair Glue" (Too vague, may be flagged) |
| Specific Sulfonium Mixture | "Aqueous Mixture of Triphenyl Sulfonium Chlorides" | "Chemical Agent" (Will be audited and likely downgraded to 3824.50) |
| Nonrefractory Mortar | "Nonrefractory Mortar for Castings" | "Concrete" (Misleading, may attract different inspections) |
β 3. Special Handling Scenarios
| Scenario | Handling Advice |
|---|---|
| Is it a Liquid or Powder? | Ensure proper hazard class identification. Liquids often require UN packaging. |
| OEM Custom Mix? | If you mix the sulfonium chlorides yourself, you must provide the exact recipe to prove eligibility for 0% duty. |
| Part of a Shipment? | If mixed with other goods, declare separately. Do not bundle a 0% chemical with a 25% binder in one HS Code line. |
π V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Notes |
|---|---|---|---|
| πΊπΈ USA | 3824.50.00.50 |
25% (High Cost) | Use 3824.99.25.00 if composition matches for 0%. |
| π¨π³ China | 3824.50.00.50 |
~7-10% | Import duties apply. |
| πͺπΊ EU | 3824.50.00.90 |
~6.5% | REACH compliance required for chemicals. |
| π―π΅ Japan | 3824.50.00.90 |
~7.5% | Slime test may be required. |
π Conclusion:
- The USA has the highest duty burden (25%) for general binders.
- If your product is the specific sulfonium chloride mixture, you have a massive cost advantage (0%) in the US.
- Documentation is the key to unlocking this 0% rate.
π VI. Common Mistakes & Pitfalls (Lessons Learned)
β Mistake 1: Calling a specialized chemical "Mold Repair Chemical" without providing composition.
π Consequence: Customs assumes it's a generic binder β 25% duty applied.
β Mistake 2: Ignoring the "5% aromatic substance" clause.
π Consequence: If the product has >5% aromatics but isn't the specific sulfonium mix, it might still fall under general 3824 categories, risking audit.
β Mistake 3: Assuming all "3824" codes have the same tariff.
π Consequence: Huge price shock when the 25% surcharge is applied unexpectedly.
β Correct Practice:
"Aqueous Mixture of Triphenyl Sulfonium Chlorides (CAS No. XXXXX-XX-X), Diphenyl (4-phenylthio)phenyl sulfonium chloride, and (thiodi-4,1-phenylene)bis(diphenyl sulfonium) dichloride. For use in semiconductor manufacturing."
π― VII. Conclusion: Precision Classification, Profit Protection!
π― Remember the Mantra:
πΉ "Specific Composition = 0% Duty. Generic Name = 25% Duty."
πΉ "Don't guess the HS Code. Prove the chemistry."
π Pro Tip:
If your product is the sulfonium chloride mixture, consider applying for a CBP Advance Ruling before shipping. This legally binds the customs officer to the 0% rate, preventing disputes at the port.
π£ Immediate Action:
π Verify the CAS Numbers of your ingredients.
π Prepare the SDS and Formula Sheet.
π Choose the correct HS Code to save 25% on every shipment!
β¨ Professional clearance starts with precise classification!
πΌ Every percentage point of duty is pure profit lost!
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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) 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.