铸造粘结剂促进剂
CN → US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3901909000 | 41.5% | CN | US | Official Doc |
| 3901905501 | 41.5% | CN | US | Official Doc |
| 3903901000 | 41.5% | CN | US | Official Doc |
| 3903905000 | 41.5% | CN | US | Official Doc |
| 3506915000 | 37.1% | CN | US | Official Doc |
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AI Analysis
🏗️ Foundry Bonding Agent Promoters (Casting Adhesive Promoters)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional-Level Strategy
📌 1. Product Definition & Classification: What is a "Foundry Bonding Agent Promoter"?
In the international trade of industrial chemicals, "Foundry Bonding Agent Promoters" are specialized additives used in metal casting processes. They accelerate the curing or hardening of polymer-based binders (adhesives) used to hold sand molds together.
Unlike general-purpose adhesives, these promoters are specific to the foundry industry and rely on the polymer composition (base material) for classification. The logic dictates that the classification depends on whether the polymer is ethylene-based, styrene-based, or a general polymer adhesive.
⚠️ Key Classification Logic: * Ethylene-based polymers → Classified under Heading 3901 * Styrene-based polymers → Classified under Heading 3903 * General polymer adhesives (regardless of specific monomer) → Classified under Heading 3506
📦 2. HS Code Classification Details (2026 Latest Tariff Authority)
Based on the provided data, here is the precise breakdown for Foundry Bonding Agent Promoters:
| HS Code | Summary Description | Logic Basis | Tax Rate (Total) |
|---|---|---|---|
3901.90.90.00 |
Polymer Foundry Bonding Agent, based on Ethylene Polymers in primary forms | Material: Ethylene Polymer; Form: Primary | 41.5% |
3901.90.55.01 |
Polymer Foundry Bonding Agent, based on Ethylene Copolymers in primary forms | Material: Ethylene Copolymer; Form: Primary | 41.5% |
3903.90.10.00 |
Polymer Foundry Bonding Agent, based on Styrene Polymers in primary forms | Material: Styrene Polymer; Form: Primary | 41.5% |
3903.90.50.00 |
Polymer Foundry Bonding Agent, based on Styrene Polymers in primary forms | Material: Styrene Polymer; Form: Primary | 41.5% |
3506.91.50.00 |
Polymer Foundry Bonding Agent, based on Polymer Material and Adhesive Use | Material: Polymer; Use: Adhesive (General) | 37.1% |
🔍 Critical Distinction: * Headings 3901 & 3903 focus on the chemical structure of the polymer (Ethylene vs. Styrene). These are classified as "Plastics and articles thereof." * Heading 3506 focuses on the functional use as an adhesive. This category generally carries a lower tax burden (37.1% vs 41.5%), making it a potentially more cost-effective classification if the product qualifies as a general-purpose adhesive rather than a specific polymer compound.
💰 3. 2026 Latest Tariff Rate Breakdown (Including Surcharges)
✅ Applicable Country: United States (US) ✅ Origin: China (CN) ✅ Effective Date: From November 10, 2025 onwards
🎯 1. 3901.90.90.00 & 3901.90.55.01 (Ethylene-Based)
| Item | Detail |
|---|---|
| Base Duty | 6.5% |
| Section 301 Surcharge | +25.0% |
| Section 122 Tariff | +10.0% |
| Total Effective Rate | 41.5% |
| Calculation Basis | CIF Value × 41.5% |
| De Minimis Exemption | ❌ NOT Eligible (Deny de minimis) |
| Legal Path | Base Tariff → Section 301 (Footnote 9903.88.01) → Section 122 (IEEPA) |
📌 Explanation: * The 25% surcharge comes from Section 301 of the Trade Act of 1974. * The 10% additional tariff is under Section 122 (or specific IEEPA provisions for Chinese goods). * Total: 41.5%. This is a high-cost category. Accurate identification of the polymer type is crucial to avoid misclassification penalties.
🎯 2. 3903.90.10.00 & 3903.90.50.00 (Styrene-Based)
| Item | Detail |
|---|---|
| Base Duty | 6.5% |
| Section 301 Surcharge | +25.0% |
| Section 122 Tariff | +10.0% |
| Total Effective Rate | 41.5% |
| Calculation Basis | CIF Value × 41.5% |
| De Minimis Exemption | ❌ NOT Eligible (Deny de minimis) |
| Legal Path | Base Tariff → Section 301 (Footnote 9903.88.01) → Section 122 (IEEPA) |
📌 Note: * Styrene-based polymers are treated identically to ethylene-based polymers in terms of tariff structure for this application. * Whether it is
3903.90.10.00or3903.90.50.00, the tax rate remains 41.5%.
🎯 3. 3506.91.50.00 (General Adhesive Logic)
| Item | Detail |
|---|---|
| Base Duty | 2.1% |
| Section 301 Surcharge | +25.0% |
| Section 122 Tariff | +10.0% |
| Total Effective Rate | 37.1% |
| Calculation Basis | CIF Value × 37.1% |
| De Minimis Exemption | ❌ NOT Eligible (Deny de minimis) |
| Legal Path | Base Tariff → Section 301 → Section 122 |
📌 Advantage: * This classification has a lower base duty (2.1%) compared to the plastic headings (6.5%). * Total Savings: 4.4% less than the 3901/3903 classifications. * Condition: The product must be clearly defined as a "Bonding Agent/Adhesive" rather than a raw polymer compound. Technical data sheets must emphasize the adhesive function over the polymer chemistry.
🛠️ 4. Customs Clearance Practical Advice (Real-World Pitfalls)
✅ 1. Documentation Checklist (Mandatory)
| Document | Required | Purpose |
|---|---|---|
| ✅ Technical Data Sheet (TDS) | ✔️ | Must specify: Polymer type (Ethylene/Styrene/Other), Function (Promoter/Adhesive), Cure Time, Temperature. |
| ✅ Formula/Composition List | ✔️ | To prove whether it is a "Polymer" (HS 39) or an "Adhesive Mixture" (HS 35). |
| ✅ Certificate of Origin | ✔️ | Required for US origin verification and tariff application. |
| ✅ Commercial Invoice | ✔️ | Must clearly state "Foundry Bonding Agent Promoter" and HS Code. |
| ✅ MSDS (Safety Data Sheet) | ✔️ | For hazardous material handling and customs safety review. |
✅ 2. Declaration Strategy (Key Mnemonic)
🔥 "Material Defines 39, Function Defines 35, Tax Save 4 Points!"
| Scenario | Recommended HS Code | Risk |
|---|---|---|
| Product is primarily an Ethylene/Styrene Polymer resin | 3901.90.90.00 / 3903.90.10.00 |
Low risk, but higher tax (41.5%). |
| Product is a mixture/formulation used specifically as an adhesive/binder | 3506.91.50.00 |
Optimal Choice. Saves 4.4% if documentation supports "Adhesive Use". |
| Product is a pure chemical accelerator with no polymer carrier | ⚠️ Check Other Headings | If it’s not a polymer or adhesive, it might fall under HS 29 (Chemical Products). Do not force it into 39 or 35. |
📌 Warning: * Misclassifying a pure adhesive as a polymer (HS 39) leads to overpayment. * Misclassifying a polymer resin as an adhesive (HS 35) leads to underpayment, fines, and potential seizure. * Always provide the TDS to Customs Broker to justify the classification.
✅ 3. Special Cases
| Situation | Advice |
|---|---|
| Mixed Packaging | If the promoter is sold with the bonding agent, declare them separately if possible. If sold as a kit, the kit’s character determines the HS code. |
| OEM Branding | Ensure the invoice lists the generic name (e.g., "Polymer Foundry Promoter") rather than just a brand name, to facilitate accurate classification. |
| Small Shipments (De Minimis) | ❌ No Exemption. All these HS codes are subject to Section 301 and Section 122 tariffs. Do not use Section 321 (De Minimis) entry. |
🌍 5. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Est. Duty Rate | Remarks |
|---|---|---|---|
| 🇺🇸 USA | 3506.91.50.00 (Preferred) |
37.1% | Highest risk due to Section 301/122. |
| 🇨🇳 China | 3506.91.50.00 |
~2-6% | Import duties vary; check latest PRC tariff. |
| 🇪🇺 EU | 3506.91.50.00 |
4.9% | No Section 301 equivalent. Standard MFN rate. |
| 🇦🇺 Australia | 3506.91.50.00 |
5% | No significant surcharges. |
| 🇯🇵 Japan | 3506.91.50.00 |
6% | Standard rate. |
📌 Conclusion: * USA is the most expensive market due to multiple layers of surcharges. * EU, Australia, and Japan are significantly more cost-effective for exporting polymer adhesives/promoters. * Consider supply chain diversification if exporting to the US to mitigate tariff risks.
📌 6. Common Mistakes & Pitfalls (Lessons Learned)
❌ Mistake 1: Declaring "Promoter" as "Chemical Additive" under HS 29 👉 Consequence: Customs may reclassify to HS 39 or 35, leading to higher duties and delays.
❌ Mistake 2: Ignoring the "Section 122" 10% Tariff 👉 Consequence: Underpayment by 10%. Back taxes + penalties are common.
❌ Mistake 3: Using "De Minimis" for small samples 👉 Consequence: Shipment held or rejected. These goods are explicitly excluded from Section 321 benefits.
✅ Correct Approach:
"Polymer Foundry Bonding Agent Promoter, Ethylene-based, for Sand Casting, MSDS Provided, US Origin Not Claimed (China Origin)."
🎯 7. Conclusion: Precision in Classification, Savings in Cost
🎯 Remember the Key:
🔹 "Ethylene/Styrene = HS 39 (41.5%) | Adhesive Function = HS 35 (37.1%)" 🔹 "Always provide TDS and MSDS to justify classification." 🔹 "No De Minimis exemption for Chinese-origin polymer adhesives to the US."
📌 Pro Tip:
If your product is a general-purpose adhesive promoter, try to structure your documentation to emphasize the adhesive use (HS 35) rather than the polymer composition (HS 39). This can save 4.4% on every shipment.
📣 Immediate Action Required:
📞 Consult a Licensed Customs Broker 📄 Prepare Technical Data Sheet (TDS) highlighting adhesive function 🚀 Accurate Classification Saves Money and Time!
✨ Professional Customs Clearance Starts with Accurate Classification! 💼 Every 1% of Duty Matters!
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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.