Mixed Hydrocarbon Investment Casting Binder
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 Mixed Hydrocarbon Investment Casting Binder (Polymer-Based)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Compliance Strategy
π I. Product Definition & Classification: Do You Really Understand "Binder"?
Mixed Hydrocarbon Investment Casting Binder is a critical material used in the metal casting industry, specifically for Investment Casting (Lost-Wax Process). It serves as the adhesive that binds sand, ceramic particles, or wax patterns together to form the mold or shell before the metal is poured.
In international trade, this product is often misclassified due to its "mixed" nature. However, customs authorities typically classify it based on its primary chemical composition and physical state (usually "primary shape" like pellets, granules, or powder).
β οΈ Key Distinction:
- If the binder is primarily composed of Styrene-based polymers, it falls under Chapter 39 (Plastics).
- If it is a general Polymer/Alkyd/Phenolic resin without specific styrene/ethylene dominance, it may fall under Chapter 35 (Albuminoidal substances; prepared binders).
- If it is primarily Ethylene-based, it falls under Chapter 39 (Polyethylene).
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
Based on the specific polymer type within the "Mixed Hydrocarbon" formulation, the following HS Codes apply. Note that all listed codes include specificιε η¨ (Additional Duties) due to current trade policies (e.g., Section 301, Section 232/122).
| HS Code | Product Description | Primary Material | Physical State | Estimated Total Tax Rate* |
|---|---|---|---|---|
3903.90.10.00 |
Polymer Casting Binder, Styrene Polymer, Primary Shape | Styrene | Primary Shape | 41.5% |
3506.91.50.00 |
Polymer Casting Binder, General Polymer, Adhesive Use | Other Polymers | Primary/Other | 37.1% |
3901.90.90.00 |
Polymer Casting Binder, Ethylene Polymer, Primary Shape | Ethylene | Primary Shape | 41.5% |
3901.90.55.01 |
Polymer Casting Binder, Ethylene Copolymer, Primary Shape | Ethylene Copolymer | Primary Shape | 41.5% |
3903.90.50.00 |
Polymer Casting Binder, Styrene Polymer, Primary Shape | Styrene | Primary Shape | 41.5% |
π Important Note:
- All codes listed above assume the product is imported from China to the US (or subject to similar trade restrictions).
- The "Total Tax" includes Base Tariff + Additional Duties (Section 301 + Section 122/IEEPA).
-3506.91.50.00is the only code with a lower total tax rate (37.1%) compared to the 41.5% for most Chapter 39 plastics. This makes it a potential optimization target if the chemical analysis supports it.
π° III. 2026 Detailed Tariff Rate Breakdown (Including Additional Duties & Policies)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Time: Current (2025-2026 Period)
π― 1. 3903.90.10.00 & 3903.90.50.00 ββ Styrene-Based Binders
| Item | Content |
|---|---|
| Base Tariff | 6.5% (ad valorem) |
| Section 301 Additional Duty | +25.0% |
| Section 122 / IEEPA Additional Duty | +10.0% |
| Total Tax Rate | 41.5% |
| Calculation Basis | CIF Value Γ 41.5% |
| De Minimis Exemption | β Not Eligible (Most plastic/resin imports >$800 are scrutinized; however, even if eligible, the rate applies to formal entries). |
| Legal Basis Path | HTSUS:3903.90.10/50 β USITC Footnote 301 (25%) β 122/IEEPA (10%) |
π Explanation:
- Styrene polymers are classified under Heading 39.03.
- The 25% Section 301 duty is standard for Chinese-origin plastics.
- The 10% Section 122 (or similar IEEPA authority) applies to certain industrial chemicals.
- Total: 6.5% + 25% + 10% = 41.5%.
π― 2. 3901.90.90.00 & 3901.90.55.01 ββ Ethylene/Ethylene Copolymer Based Binders
| Item | Content |
|---|---|
| Base Tariff | 6.5% (ad valorem) |
| Section 301 Additional Duty | +25.0% |
| Section 122 / IEEPA Additional Duty | +10.0% |
| Total Tax Rate | 41.5% |
| Calculation Basis | CIF Value Γ 41.5% |
| De Minimis Exemption | β Not Eligible |
| Legal Basis Path | HTSUS:3901.90 β USITC Footnote 301 (25%) β 122/IEEPA (10%) |
π Explanation:
- Ethylene polymers fall under Heading 39.01.
- The tax structure is identical to styrene-based binders in this context.
- Total: 6.5% + 25% + 10% = 41.5%.
π― 3. 3506.91.50.00 ββ General Polymer Adhesives (Optimization Target)
| Item | Content |
|---|---|
| Base Tariff | 2.1% (ad valorem) |
| Section 301 Additional Duty | +25.0% |
| Section 122 / IEEPA Additional Duty | +10.0% |
| Total Tax Rate | 37.1% |
| Calculation Basis | CIF Value Γ 37.1% |
| De Minimis Exemption | β Not Eligible |
| Legal Basis Path | HTSUS:3506.91.50 β USITC Footnote 301 (25%) β 122/IEEPA (10%) |
π Explanation:
- Chapter 35 covers "Albuminoidal substances; prepared binders." If the product is classified as a prepared binder rather than a primary plastic, it benefits from a lower base tariff (2.1%).
- Savings: 4.4% lower total tax rate compared to Chapter 39 codes.
- Requirement: The product must be proven to be a "prepared binder" suitable for adhesive use, not just a raw polymer resin. This requires strong chemical documentation.
π οΈ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Avoidance)
β 1. Required Documentation Checklist (Non-Negotiable)
| Document | Must Provide | Purpose |
|---|---|---|
| β Technical Data Sheet (TDS) | βοΈ | To prove chemical composition (Styrene vs. Ethylene vs. Mixed). |
| β Formula/Composition Analysis | βοΈ | Critical for determining HS Code (Chapter 39 vs. 35). |
| β Product Photos (Bulk & Label) | βοΈ | To verify "Primary Shape" (pellets, powder, etc.). |
| β Statement of Function | βοΈ | Explicitly state "Investment Casting Binder" to rule out general-purpose adhesives. |
| β Commercial Invoice | βοΈ | Clearly describe product as "Polymer Binder for Casting," not just "Glue." |
| β Certificate of Origin | βοΈ | Essential for applying correct base tariffs and verifying origin for Section 301. |
β 2. Declaration Strategy (Key Mnemonics)
π₯ "Shape Matters, Chemistry Rules, Name Defines!"
| Scenario | Correct HS Code | Wrong Code | Consequence |
|---|---|---|---|
| Styrene-based pellets | 3903.90.10.00 |
3506.91.50.00 |
Potential audit for misclassification if chemical proof is weak. |
| General Adhesive Resin | 3506.91.50.00 |
3901.90.90.00 |
Overpaying 4.4% in taxes. Try to claim Chapter 35 if formula allows. |
| Ethylene-based | 3901.90.90.00 |
3903.90.10.00 |
Misclassification leads to compliance flags. |
| Liquid Binder | Different Codes | Primary Shape Codes | Liquids often have different HS codes. Ensure "Primary Shape" is accurate. |
β 3. Special Cases & Mitigation
| Situation | Handling Advice |
|---|---|
| "Mixed" Hydrocarbon | If the formula is a blend, analyze the dominant polymer. If >50% is Styrene, use 3903. If it's a composite resin that functions primarily as a binder, argue for 3506.91.50.00 to save 4.4%. |
| Section 301 Exclusions | Check if the specific HS Code has an exclusion list (e.g., 301(h) or (i)). Many polymer binders were excluded or restored. Verify current exclusion status! |
| Section 232/122 Steel/Aluminum | Investment casting binders are not steel/aluminum. Ensure you are not incorrectly triggering steel-related duties. |
π V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Base Tariff | Additional Duties (China Origin) | Total Estimated Tax | Notes |
|---|---|---|---|---|---|
| πΊπΈ USA | 3506.91.50.00 (Preferred) |
2.1% | +35% (301+122) | 37.1% | Best rate if Chapter 35 applies. |
| πΊπΈ USA | 3903.90.10.00 |
6.5% | +35% (301+122) | 41.5% | Default for Styrene/Ethylene. |
| π¨π³ China | 3506.91.50.00 |
2.1% | 0% | 2.1% | No additional duties for domestic import. |
| πͺπΊ EU | 3903.90 or 3506 |
6.5% / 2.1% | 0% (No Section 301) | ~2-7% | No additional US-style tariffs. |
| π¦πΊ Australia | 3903.90 |
5% | 0% | 5% | Lower base rate, no additional duties. |
π Conclusion:
- The USA imposes the highest cost due to Section 301 (25%) and Section 122 (10%).
- Chapter 35 (3506.91.50.00) offers the lowest total duty (37.1%) if the product can be chemically justified as a "prepared binder."
- EU and Australia are much more favorable, with only base tariffs applying.
π VI. Common Errors & Pitfall Guide (Lessons Learned)
β Error 1: Classifying all "binders" under Chapter 39.
π Consequence: Overpaying 4.4% in taxes.
π Solution: Conduct a chemical composition analysis. If the product is a "prepared binder" (mixed resins, additives), argue for 3506.91.50.00.
β Error 2: Ignoring Section 301 Exclusions.
π Consequence: Paying 35% additional duties when an exclusion applies.
π Solution: Check the USTR Exclusion List for your specific HS Code and manufacturer. Many polymer binders have been excluded or are subject to lower rates.
β Error 3: Vague Description "Casting Glue."
π Consequence: Customs delays, requests for chemical reports, potential misclassification.
π Solution: Use precise terms: "Styrene Polymer Binder for Investment Casting, Primary Shape, Pellets."
β Error 4: Assuming "Mixed" means no primary polymer.
π Consequence: Incorrect Chapter 35 classification if the primary component is clearly a plastic polymer.
π Solution: Ensure the "primary shape" and "principal material" are correctly identified per GRI 3(b).
β Correct Practice:
"Polymer Casting Binder, Styrene-Based, Primary Shape, for Investment Casting, Model XYZ, Chemical Composition: 80% Styrene Copolymer, 20% Additives."
π― VII. Conclusion: Precision Classification Saves Money!
π― Remember the Mnemonic:
πΉ "Styrene/Ethylene = 41.5% (Chapter 39)"
πΉ "Prepared Binder = 37.1% (Chapter 35)"
πΉ "Check Exclusions! Section 301 can be waived!"
π Pro Tip:
If your binder is Excluded from Section 301, your total tax drops to 10% (just the 122 duty) or even 6.5% (if 122 also excluded). Always verify exclusion status!
π£ Immediate Action:
π Request a chemical analysis from your supplier.
π Apply for an Advance Ruling with US Customs (CBP) if the classification is ambiguous.
π Optimize for 3506.91.50.00 if chemically possible, and check exclusions to reduce costs further.
β¨ Professional Customs Clearance Starts with Precise Classification!
πΌ Every 1% tax saved is pure profit!
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.