Low Viscosity Binder for Casting
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3909505000 | 41.3% | CN | US | Official Doc |
| 3909400000 | 41.5% | CN | US | Official Doc |
| 3810905000 | 40.0% | CN | US | Official Doc |
| 3810902000 | 35.0% | CN | US | Official Doc |
| 3506990000 | 37.1% | CN | US | Official Doc |
AI Analysis
π Low Viscosity Binder for Casting (Foundry Adhesives)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Breakdown | Professional Clearance Strategy
π I. Product Definition & Classification: What is a "Low Viscosity Binder"?
In the context of international trade, a "Low Viscosity Binder for Casting" refers to chemical agents used in metal foundries to bind sand particles together for mold and core formation. The key characteristics are: 1. Function: Acts as an adhesive/binding agent. 2. Physical State: Liquid/Low Viscosity (easy to mix/inject). 3. Chemical Nature: Typically composed of resins (Phenolic, Urethane/Polyurethane, Amino) or inorganic compounds.
β οΈ Critical Distinction:
The correct HS Code depends entirely on the chemical composition (Resin vs. Inorganic vs. General Chemical Preparation). Misclassification leads to significant tariff discrepancies (from 35% to 41.5%).
π¦ II. HS Code Classification Matrix (Based on Provided Data)
| HS Code | Product Description | Logic & Summary from Data | Total Tax Rate |
|---|---|---|---|
| 3909.50.50.00 | Other Polyurethanes/Amino Resins (Primary Forms) | Matches "Binder" via core ingredient inference. Classified under Resins (Chapter 39) due to polyurethane/amino resin characteristics. No material/form conflict. | 41.3% |
| 3909.40.00.00 | Phenolic Resins (Primary Forms) | Matches "Binder" via chemical attribute. Casting binders are often phenolic/amino/PU. Matches logic for Phenolic Resins classification. | 41.5% |
| 3810.90.50.00 | Other Auxiliary Preparations for Metalworking | Matches via "Auxiliary Material" attribute. Classified as a chemical preparation (Chapter 38) rather than raw resin. Fits "Other auxiliary preparations." | 40.0% |
| 3810.90.20.00 | Auxiliary Preparations for Metal/Non-Metal Processing (Inorganic) | Matches usage as metal casting aid. Inferred to contain inorganic components. Fits "Composed entirely of inorganic substances" catch-all for auxiliary prep. | 35.0% |
| 3506.99.00.00 | Other Prepared Adhesives | Matches "Prepared Chemical Binder." Classified under Adhesives (Chapter 35). Inferred as chemical synthetic/mixed substance. No conflict with "Other prepared adhesives." | 37.1% |
π° III. 2026 Latest Tariff Rate Breakdown (US Market)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Date: November 10, 2025 onwards (Includes subsequent imports)
π― 1. Chapter 39: Plastics and Resins (Highest Tariffs)
Codes: 3909.50.50.00 & 3909.40.00.00
| Item | Content |
|---|---|
| Base Duty | 6.3% β 6.5% (Ad Valorem) |
| Section 301 Duty (Add-on) | +25.0% |
| IEEPA Duty (122 Clause) | +10.0% |
| Total Effective Rate | 41.3% β 41.5% |
| Tax Calculation | CIF Value Γ Total Rate |
| De Minimis Eligibility | β No (Denied) |
| Legal Path | USITC:3909.xx β 301 Footnote β IEEPA:9903.01.24 |
π Interpretation:
If customs determines your binder is a resin (chemical base material) rather than a mixed preparation, you fall into Chapter 39. These rates are the highest among the options. This classification assumes the product is primarily a polyurethane, amino, or phenolic resin in its primary form.
π― 2. Chapter 38: Chemical Products & Preparations (Mid-Range Tariffs)
Codes: 3810.90.50.00 & 3810.90.20.00
A. 3810.90.50.00 (Other Auxiliary Preparations)
| Item | Content |
|---|---|
| Base Duty | 5.0% |
| Section 301 Duty | +25.0% |
| IEEPA Duty | +10.0% |
| Total Rate | 40.0% |
B. 3810.90.20.00 (Inorganic Auxiliary Preparations)
| Item | Content |
|---|---|
| Base Duty | 0.0% |
| Section 301 Duty | +25.0% |
| IEEPA Duty | +10.0% |
| Total Rate | 35.0% |
π Interpretation:
-3810.90.20.00is the LOWEST rate option (35%), but it requires proving the binder is composed entirely or predominantly of inorganic substances. If your binder is organic (resin-based), this classification is risky and may be challenged. -3810.90.50.00is a safer "catch-all" for chemical preparations that don't fit specific organic/inorganic buckets, costing 40%.
π― 3. Chapter 35: Albuminoidal Substances & Adhesives (Lower Base, but Higher Effective?)
Code: 3506.99.00.00
| Item | Content |
|---|---|
| Base Duty | 2.1% |
| Section 301 Duty | +25.0% |
| IEEPA Duty | +10.0% |
| Total Rate | 37.1% |
π Interpretation:
Classified as a Prepared Adhesive. While the base duty is low (2.1%), the total effective rate is 37.1%. This is lower than the Resin classification (41%+) but higher than the Inorganic Auxiliary prep (35%). This is a strong candidate if the product is a ready-to-use mixed adhesive formulation.
π οΈ IV. Customs Clearance Operational Advice
β 1. Documentation Checklist (Critical for Classification)
| Document | Requirement | Purpose |
|---|---|---|
| β MSDS / SDS | Mandatory | Must clearly list chemical composition. If it lists "Phenolic Resin," expect 3909. If "Inorganic Silicates," expect 3810.90.20. |
| β Ingredient Declaration | Mandatory | Detail % of each component. Distinguish between "Active Resin" vs. "Mixed Solvent/Additives." |
| β Product Specifications | Mandatory | Confirm "Low Viscosity" is due to solvents/thinners, not changing the base chemical nature. |
| β Intended Use Statement | Mandatory | "For Foundry/Casting Mold Binding." Confirms use under HS 3810 (Auxiliary for Metal Working). |
| β Structure Diagram | Optional | If it's a kit or mixed system, show how components interact. |
β 2. Declaration Strategy (Key Mantra)
π₯ "Resin is Chapter 39 (41%), Chemical Prep is 38 (35-40%), Adhesive is 35 (37%).
Prove Inorganic for the 35% rate; Prove Ready-to-Use Mix for the 37% rate."
| Scenario | Recommended HS Code | Risk Level |
|---|---|---|
| Pure Resin Liquid (e.g., Liquid Phenolic) | 3909.40.00.00 |
π΄ High Rate (41.5%). Hard to avoid if pure. |
| Mixed Foundry Binder (Resin + Solvents + Hardeners) | 3506.99.00.00 |
π‘ Mid Rate (37.1%). Safe for "Prepared Adhesives." |
| Inorganic Binder (e.g., Sodium Silicate-based) | 3810.90.20.00 |
π’ Lowest Rate (35%). Must verify "Inorganic" status. |
| General Metalworking Aid (Vague chemical mix) | 3810.90.50.00 |
π Mid-High Rate (40%). Fallback option. |
β 3. Special Circumstances & Pitfalls
| Situation | Advice |
|---|---|
| OEM / Private Label | Ensure the MSDS matches the declared HS Code. If you claim 3506 (Adhesive) but MSDS shows 90% Phenolic Resin, Customs will reclassify to 3909 and charge back-tariffs. |
| "Low Viscosity" Claim | Don't use "Low Viscosity" as the primary descriptor in the commercial invoice. Use "Prepared Adhesive for Metal Casting" or "Foundry Chemical Binder" to steer towards Chapter 38 or 35. |
| Origin Verification | If shipped from a third country (e.g., Vietnam, Mexico), check if IEEPA duties apply. If origin is China, all above rates apply. |
| Bonds & Surety | For high-value shipments, ensure you have a Continuous Bond to cover potential 40%+ duty liabilities. |
π V. Global Market Comparison (2026 Context)
| Market | Recommended HS | Est. Total Tax (China Origin) | Notes |
|---|---|---|---|
| πΊπΈ USA | 3810.90.20.00 (if Inorganic) or 3506.99.00.00 |
35% - 37.1% | 301 + IEEPA duties apply. Avoid Chapter 39 if possible. |
| π¨π³ China | 3506.91.00 (Import) |
Low | Import duties may be lower, but focus is on US Export data here. |
| πͺπΊ EU | 3824.99 or 3506.91 |
0% - 4% | Generally no Section 301 equivalent, but VAT applies. |
| π¬π§ UK | 3506.91 |
0% - 5% | Post-Brexit tariffs are favorable for chemicals. |
π Conclusion:
The US market is the most expensive due to the combination of Base Tariff + Section 301 (25%) + IEEPA (10%).
Strategy: Aggressively classify as "Prepared Adhesive" (3506) or "Inorganic Auxiliary" (3810) rather than "Resin" (3909) to save 4-6% in duties.
π VI. Common Errors & How to Avoid Them (Blood Lessons)
β Error 1: Describing the product simply as "Binder" on the Invoice.
π Consequence: Customs officer may default to the highest risk category (Resin/3909).
β
Fix: Use "Prepared Foundry Adhesive, Low Viscosity, Chemical Composition: [List Key Ingredients]".
β Error 2: Claiming Inorganic (3810.90.20) when the binder is Organic Resin-based.
π Consequence: Audit, penalty, and back-tariff of ~6-15% difference.
β
Fix: Only use 3810.90.20 if the MSDS confirms inorganic salts/silicates.
β Error 3: Ignoring IEEPA 10%.
π Consequence: Unexpected surprise fee at border.
β
Fix: Always calculate Total Tax = Base + 25% + 10%.
π― VII. Final Recommendation
- Best Cost-Saving Route:
If your binder is inorganic (e.g., silicate-based), classify under3810.90.20.00(35% Total). - Safest "Ready-to-Use" Route:
If it's a standard resin-based foundry binder, classify under3506.99.00.00(37.1% Total). It is cheaper than Resin classification and safer than forcing an inorganic claim. - Avoid:
3909.40.00.00or3909.50.50.00(41.3-41.5%) unless the product is a raw, unprepared resin sold in bulk for further manufacturing.
π£ Immediate Action:
π Review your MSDS. Does it list "Resin" as the primary component?
π If Yes: Aim for3506.99.00.00(Prepared Adhesive).
π If No (Inorganic): Aim for3810.90.20.00(35% Rate).
π Consult a licensed customs broker for an Advance Ruling (Ruling Letter) to lock in the lower rate before shipment.
β¨ Precision in Chemistry, Precision in Customs!
πΌ Save 4-6% on every shipment by choosing the right HS Code!
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.