Casting Mold Adhesive Formula
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3903901000 | 41.5% | CN | US | Official Doc |
| 3506915000 | 37.1% | CN | US | Official Doc |
| 3901909000 | 41.5% | CN | US | Official Doc |
| 3901905501 | 41.5% | CN | US | Official Doc |
| 3903905000 | 41.5% | CN | US | Official Doc |
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π§ͺ Polymer Casting Mold Adhesive Formulas | HS Code Classification & 2026 US Customs Guide
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
π One, Product Definition and Classification: What is "Polymer Casting Adhesive"?
Polymer casting adhesives are specialized bonding agents used to secure sand cores, metal molds, or composite structures in the casting industry. They are typically made from styrene polymers, ethylene polymers, or ethylene copolymers in their primary shape.
In international trade, these products are classified based on their chemical composition and form:
- Styrene-based Adhesives: Often classified under Chapter 39 (Plastics) due to their polymer nature.
- Ethylene-based Adhesives: Also classified under Chapter 39, but under different sub-headings depending on whether it is homopolymer or copolymer.
- General Polymer Adhesives: If the specific polymer type is not clearly defined or falls into broader categories, it may be classified under general adhesive headings (Chapter 35).
β οΈ Key Distinction Point:
- If the product is a polymer in primary shape used as an adhesive (e.g., granules, powders, liquids with high polymer content) β Chapter 39 (Plastics).
- If the product is a prepared adhesive based on polymers but not primarily classified as a plastic resin β Chapter 35 (Protein substances, modified starches, glues).
- Misclassification Risk: Declaring polymer adhesives as "chemical preparations" under Chapter 35 when they should be Chapter 39 can lead to significant tariff differences and customs delays.
π¦ Two, HS Code Classification Details (2026 Latest Tariff Authoritative Comparison)
| HS Code | Product Description | Application Scenario | Key Characteristic |
|---|---|---|---|
3903.90.10.00 |
Styrene polymer casting adhesive, primary shape | Sand core bonding, mold making | Styrene-based, primary shape |
3903.90.50.00 |
Styrene polymer casting adhesive, primary shape, classified under "other" | General mold adhesives, non-standard styrene types | Styrene-based, other category |
3901.90.90.00 |
Ethylene polymer casting adhesive, primary shape | Industrial casting, high-strength bonds | Ethylene homopolymer, primary shape |
3901.90.55.01 |
Ethylene copolymer casting adhesive, other polymers category | Specialized casting applications, blended polymers | Ethylene copolymer, other category |
3506.91.50.00 |
Polymer casting adhesive, other adhesive category | General polymer-based adhesives, not specifically plastic resins | General polymer adhesive, not primary shape/resin |
π Key Reminder:
- All styrene-based and ethylene-based adhesives in primary shape are classified under Chapter 39 (Plastics).
- If the product is a prepared adhesive (e.g., mixed with solvents, fillers, or additives) and does not fit the "primary shape" definition, it may fall under 3506.91.50.00.
- Misclassification: Declaring a styrene polymer adhesive as "other adhesive" (3506) when it is clearly a styrene polymer (3903) can lead to tariff differences and penalties.
π° Three, 2026 Latest Tariff Rate Details (Including Additional Taxes, Policy Add-ons)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Date: From November 10, 2025 (including subsequent imports)
π― 1. 3903.90.10.00 β Styrene Polymer Casting Adhesive (Primary Shape)
| Item | Content |
|---|---|
| Base Tariff | 6.5% (ad valorem) |
| Section 301 Additional Tariff | +25.0% (from USITC Footnote 9903.88.01) |
| Section 122 Additional Tariff | +10.0% (against China/HK products) |
| Total Tariff Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Exemption | β Not Eligible (deny_de_minimis) |
| Legal Basis Path | Section 122:10 β Section 301:25 β USITC:3903.90.10.00 β FOOTNOTE:9903.88.01 |
π Explanation:
- The 25% Section 301 tariff is imposed under the US Trade Act Section 301 on Chinese goods;
- The 10% Section 122 tariff is a separate levy targeting specific Chinese imports;
- Total 41.5% is a high tariff rate, requiring advance planning!
π― 2. 3506.91.50.00 β Polymer Casting Adhesive (Other Adhesive Category)
| Item | Content |
|---|---|
| Base Tariff | 2.1% (ad valorem) |
| Section 301 Additional Tariff | +25.0% |
| Section 122 Additional Tariff | +10.0% |
| Total Tariff Rate | 37.1% |
| Tax Calculation | CIF Value Γ 37.1% |
| De Minimis Exemption | β Not Eligible |
| Legal Basis Path | Section 122:10 β Section 301:25 β USITC:3506.91.50.00 β FOOTNOTE:9903.88.01 |
π Note:
- This category is for polymer adhesives that are not primarily classified as plastics (i.e., not in primary shape).
- Base rate is lower (2.1%), but with additional tariffs, the total is 37.1%, still high.
- Misclassification Risk: If you declare a styrene polymer adhesive (Chapter 39) as this category (Chapter 35), you risk penalties for misdeclaration.
π― 3. 3903.90.50.00 β Styrene Polymer Casting Adhesive (Primary Shape, Other Category)
| Item | Content |
|---|---|
| Base Tariff | 6.5% |
| Section 301 Additional Tariff | +25.0% |
| Section 122 Additional Tariff | +10.0% |
| Total Tariff Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Exemption | β Not Eligible |
| Legal Basis Path | Section 122:10 β Section 301:25 β USITC:3903.90.50.00 β FOOTNOTE:9903.88.01 |
π Note:
- Same as3903.90.10.00, but for other styrene polymers not specifically listed.
- Total tariff 41.5%, same as above.
π― 4. 3901.90.90.00 β Ethylene Polymer Casting Adhesive (Primary Shape)
| Item | Content |
|---|---|
| Base Tariff | 6.5% |
| Section 301 Additional Tariff | +25.0% |
| Section 122 Additional Tariff | +10.0% |
| Total Tariff Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Exemption | β Not Eligible |
| Legal Basis Path | Section 122:10 β Section 301:25 β USITC:3901.90.90.00 β FOOTNOTE:9903.88.01 |
π Note:
- For ethylene homopolymers in primary shape.
- Total tariff 41.5%, same as styrene polymers.
π― 5. 3901.90.55.01 β Ethylene Copolymer Casting Adhesive (Other Polymers Category)
| Item | Content |
|---|---|
| Base Tariff | 6.5% |
| Section 301 Additional Tariff | +25.0% |
| Section 122 Additional Tariff | +10.0% |
| Total Tariff Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Exemption | β Not Eligible |
| Legal Basis Path | Section 122:10 β Section 301:25 β USITC:3901.90.55.01 β FOOTNOTE:9903.88.01 |
π Note:
- For ethylene copolymers, classified under "other polymers".
- Total tariff 41.5%, same as other Chapter 39 polymer adhesives.
π οΈ Four, Customs Clearance Practical Advice (Practical Pitfall Avoidance Guide)
β 1. Preparation Material Checklist (All Are Mandatory)
| Material | Mandatory | Description |
|---|---|---|
| β Product Specification Sheet | βοΈ | Includes chemical composition, polymer type (styrene/ethylene), form (primary shape) |
| β Material Safety Data Sheet (MSDS) | βοΈ | Required for chemical products, shows flammability, toxicity, etc. |
| β Product Photos (with Label) | βοΈ | Clear display of model, brand, input/output parameters |
| β Certificate of Origin (CO) | βοΈ | If not Chinese origin, eligible for preferential rates |
| β Commercial Invoice | βοΈ | Must specify "Polymer Casting Adhesive, [Polymer Type], Primary Shape" |
| β Packing List | βοΈ | Indicates relationship between machine and accessories, avoid split declaration |
β 2. Declaration Techniques (Key Mnemonic)
π₯ βPrimary Shape, Chapter 39; Prepared Glue, Chapter 35; Misdeclare, Pay Double!β
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Styrene polymer in primary shape | 3903.90.10.00 or 3903.90.50.00 |
Misdeclare as "adhesive" (3506) β 37.1% vs 41.5% |
| Ethylene polymer in primary shape | 3901.90.90.00 or 3901.90.55.01 |
Misdeclare as "adhesive" (3506) β 37.1% vs 41.5% |
| Prepared polymer adhesive | 3506.91.50.00 |
Misdeclare as primary shape β 37.1% vs 41.5% |
| Mixed polymer/adhesive | Consult customs for pre-ruling | Guess β Risk of penalty |
β 3. Special Case Handling
| Scenario | Handling Advice |
|---|---|
| OEM Custom Adhesive | Provide customer order + formula sheet to avoid "non-standard" classification |
| Adhesive with Solvents | If solvent content >10%, may be classified as "chemical preparation" (Chapter 38) |
| Adhesive for Medical Use | If for medical casting, provide proof for "non-industrial" exemption (if applicable) |
| Adhesive for Military/Aerospace | May apply for "special purpose" declaration, rate may be lower, communicate in advance |
π Five, Global Major Market Customs Clearance Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification Requirements | Notes |
|---|---|---|---|---|
| πΊπΈ United States | 3903.90.10.00 / 3901.90.90.00 |
41.5% (China origin) | MSDS + TSCA | High tariff, strict classification |
| π¨π³ China | 3903.90.10.00 / 3901.90.90.00 |
6.5% | No additional taxes | Base rate only |
| πͺπΊ European Union | 3903.90.10.00 / 3901.90.90.00 |
6.5% (if REACH compliant) | REACH + SDS | No additional tariffs |
| π¬π§ United Kingdom | 3903.90.10.00 / 3901.90.90.00 |
6.5% | UK REACH | No additional tariffs |
| π―π΅ Japan | 3903.90.10.00 / 3901.90.90.00 |
6.0% | JIS | No additional tariffs |
π Conclusion:
- The United States is the only market imposing high additional tariffs on polymer casting adhesives;
- Chinese-origin adhesives face high clearance costs in the US, suggest evaluating production relocation or supply chain adjustments.
π Six, Common Mistakes & Pitfall Avoidance Guide (Blood Lessons)
β Mistake 1: Declaring "polymer adhesive" as "chemical preparation" (Chapter 38)
π Consequence: Tariff misclassification β Penalty + Back Tax!
β Mistake 2: Declaring "primary shape polymer" as "prepared adhesive" (3506)
π Consequence: Tariff from 41.5% to 37.1% β Under-declaration β Audit Risk!
β Mistake 3: Not providing MSDS, only writing "adhesive"
π Consequence: Customs cannot determine composition β Delay in Release or Return!
β Mistake 4: Using "casting glue" or "polymer glue" as declaration name
π Consequence: If actually primary shape, misclassification β Back Tax + Late Fee!
β Correct Practice:
"Styrene Polymer Casting Adhesive, Primary Shape, Granular Form, Model XYZ, MSDS Provided, TSCA Compliant"
π― Seven, Conclusion: Professional Declaration, Save Time and Money!
π― Remember the Mnemonic:
πΉ "Primary Shape, Chapter 39; Prepared Glue, Chapter 35; Misdeclare, Pay Double!"
πΉ "HS Code Determines Destiny, Tariff Difference 4%, Declaration One Step, Back Tax Thousands!"
π Tips:
If your polymer casting adhesive is originated from Vietnam, Mexico, Thailand, or Malaysia, you may apply for Section 122 Exemption, tariff is only 6.5%;
Suggest applying for Advance Ruling in advance to avoid clearance risks.
π£ Take Action Now:
π Contact Professional Customs Broker + Provide Product Photos + Apply for HS Code Advance Ruling
π Let your polymer casting adhesive, smooth clearance, efficient export, double profit!
β¨ Professional Clearance, Starts with Precise Classification!
πΌ Every Penny of Your Cost Deserves to be Precisely Calculated!
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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.