Polyurethane Structural Cement
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3909505000 | 41.3% | CN | US | Official Doc |
| 3909502000 | 37.1% | CN | US | Official Doc |
| 3506915000 | 37.1% | CN | US | Official Doc |
| 3506990000 | 37.1% | CN | US | Official Doc |
| 3909505000 | 41.3% | CN | US | Official Doc |
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ποΈ Polyurethane Structural Cement: HS Code Classification & Customs Clearance Guide (2026)
π HS Code Reference & Customs Strategy | 2026 Latest Tariff Analysis | Professional Clearance Protocol
π I. Product Definition & Classification: What Exactly Is "Polyurethane Structural Cement"?
Polyurethane Structural Cement is a specialized composite construction material that integrates polyurethane resin with cementitious components. In international trade, its classification hinges on whether it is viewed primarily as a polymeric resin or as a prepared adhesive. The distinction determines the HS Code and, consequently, the total tax burden.
β οΈ Key Distinction Point:
- If classified as a Polyurethane Resin/Chemical β HS Codes 3909.50.50.00 (Higher Base Tariff)
- If classified as a Polymer-based Adhesive/Glue β HS Codes 3506.91.50.00 or 3506.99.00.00 (Lower Base Tariff)
π¦ II. HS Code Classification Details (2026 Latest Tariff Alignment)
| HS Code | Product Description | Applicable Scenario | Material Basis |
|---|---|---|---|
3909.50.50.00 |
Polyurethane resins in primary forms; composite application forms | Structural cement containing PU components, no material conflict with resin limits | β Polyurethane Resin/Chemical |
3909.50.20.00 |
Polyurethane resins in primary forms; typical application forms | Standard PU product forms fitting resin category limits | β Polyurethane Resin/Chemical |
3506.91.50.00 |
Other prepared adhesives based on polymers; polymer-based binders | PU-based adhesives fitting "polymer-based binder" material requirements | β Polymer-based Adhesive |
3506.99.00.00 |
Other prepared adhesives; common adhesive materials | Formulated adhesives fitting general adhesive categories | β Prepared Adhesive |
π Key Reminder:
- "Structural Cement" is a composite form. It can be argued as either a resin application or an adhesive formulation. - No material conflict: Polyurethane components are inherent to both resin and adhesive classifications, but the base tariff rate differs significantly.
π° III. 2026 Latest Tariff Rate Breakdown (Including Surtaxes & Policy Add-ons)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Date: 2025 November 10 onwards (including subsequent imports)
π― 1. 3909.50.50.00 β Polyurethane Resin/Composite Application
| Item | Content |
|---|---|
| Base Tariff | 6.3% (Ad Valorem) |
| Section 301 Surcharge | +25.0% (USITC Footnote 9903.88.01) |
| Section 122 / IEEPA Add-on | +10.0% (Targeting China/HK products) |
| Total Tax Rate | 41.3% |
| Tax Calculation | CIF Value Γ 41.3% |
| De Minimis Exemption? | β No (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 β IEEPA:9903.01.24 β USITC:3909.50.50.00 β FOOTNOTE:9903.88.01 |
π Explanation:
- The 6.3% base tariff is significantly higher than the adhesive category. - Combined with 25% Section 301 and 10% IEEPA, the total burden is 41.3%. - This classification is riskier for cost control due to the higher base rate.
π― 2. 3909.50.20.00 β Polyurethane Resin (Typical Form)
| Item | Content |
|---|---|
| Base Tariff | 2.1% (Ad Valorem) |
| Section 301 Surcharge | +25.0% |
| Section 122 / IEEPA Add-on | +10.0% |
| Total Tax Rate | 37.1% |
| Tax Calculation | CIF Value Γ 37.1% |
| De Minimis Exemption? | β No |
| Legal Basis Path | IEEPA:9901.25 β IEEPA:9903.01.24 β USITC:3909.50.20.00 β FOOTNOTE:9903.88.01 |
π Note:
- Lower base tariff (2.1%) makes this cheaper than 3909.50.50.00 by 4.2 percentage points. - Suitable if the product can be clearly defined as a "typical form" of PU resin rather than a composite cement mix.
π― 3. 3506.91.50.00 β Polymer-Based Adhesive
| Item | Content |
|---|---|
| Base Tariff | 2.1% (Ad Valorem) |
| Section 301 Surcharge | +25.0% |
| Section 122 / IEEPA Add-on | +10.0% |
| Total Tax Rate | 37.1% |
| Tax Calculation | CIF Value Γ 37.1% |
| De Minimis Exemption? | β No |
| Legal Basis Path | IEEPA:9901.25 β IEEPA:9903.01.24 β USITC:3506.91.50.00 β FOOTNOTE:9903.88.01 |
π Critical Advantage:
- Classified as an adhesive (based on polymer binders). - Same total rate as 3909.50.20.00 (37.1%), but often easier to justify for construction chemicals.
π― 4. 3506.99.00.00 β Other Prepared Adhesives
| Item | Content |
|---|---|
| Base Tariff | 2.1% (Ad Valorem) |
| Section 301 Surcharge | +25.0% |
| Section 122 / IEEPA Add-on | +10.0% |
| Total Tax Rate | 37.1% |
| Tax Calculation | CIF Value Γ 37.1% |
| De Minimis Exemption? | β No |
| Legal Basis Path | IEEPA:9901.25 β IEEPA:9903.01.24 β USITC:3506.99.00.00 β FOOTNOTE:9903.88.01 |
π General Category:
- A "catch-all" for formulated adhesives. - Useful if the product doesn't fit the specific "polymer-based" definition of 3506.91.50.00.
π οΈ IV. Customs Clearance Operational Advice (Practical Pitfall Avoidance)
β 1. Required Documentation Checklist (None Can Be Omitted)
| Document | Must Provide | Explanation |
|---|---|---|
| β Product Specification Sheet | βοΈ | Must detail composition: % PU resin, % cement, additives. |
| β Formula/Composition Breakdown | βοΈ | Critical for distinguishing between "Resin" vs. "Adhesive". |
| β Product Photos (with Label) | βοΈ | Clear view of packaging, warnings, and intended use (e.g., "Structural Bonding"). |
| β Third-Party Test Report | βοΈ | Strength tests, chemical resistance, polymer content verification. |
| β Commercial Invoice | βοΈ | Describe as "Polyurethane Adhesive" or "Polymer-Based Structural Cement" β avoid vague terms. |
| β Certificate of Origin (CO) | βοΈ | If not CN origin, may qualify for lower rates. |
| β Packing List | βοΈ | Show single-item shipments to avoid split declaration issues. |
β 2. Declaration Strategies (Key Mnemonics)
π₯ "Adhesive Wins, Resin Costs More; Base Rate is Key!"
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| High PU Content, Primary Use: Bonding | 3506.91.50.00 or 3506.99.00.00 (37.1%) |
Declared as 3909.50.50.00 β 41.3% |
| Cement-Dominant, PU as Additive | Argue for 3506.99.00.00 |
Declared as 3909.50.20.00 β Risk of reclassification |
| Pure PU Resin (No Cement) | 3909.50.20.00 |
Declared as adhesive β Customs Rejection |
| Mixed Chemical Package | Provide formula proof | Vague description β Audit/Seizure |
β 3. Special Circumstances Handling
| Situation | Handling Advice |
|---|---|
| OEM Custom Formulations | Provide client specs + R&D formulas to justify adhesive classification. |
| Dual-Use (Sealant + Adhesive) | Use 3506.99.00.00 as it covers "other prepared adhesives." |
| New Product Launch | Request Advance Ruling (CBP Ruling) to lock in HS Code. |
| Supply Chain Diversification | If shipped from Vietnam/Mexico, check for IEEPA exemptions. |
π V. Global Market Clearance Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Total Tariff | Certification Required | Notes |
|---|---|---|---|---|
| πΊπΈ United States | 3506.91.50.00 / 3506.99.00.00 |
37.1% | TSCA + SDS | Avoid 3909.50.50.00 (41.3%) |
| π¨π³ China | 3506.91.50.00 |
5% | ISO 9001 | No Section 301/IEEPA |
| πͺπΊ EU | 3506.91.50.00 |
0%~6.5% | REACH + CLP | No major surcharges |
| π¦πΊ Australia | 3506.99.00.00 |
5% | GHS | Stable rates |
| π―π΅ Japan | 3506.91.50.00 |
0%~2.5% | JIS | Low duty environment |
π Conclusion:
- The US is the most expensive market due to 301 + IEEPA surcharges. - Choosing3506(Adhesive) over3909.50.50(Resin) saves 4.2% on total duty. - Non-China origins (e.g., Vietnam) may still face US surcharges, so verify origin rules carefully.
π VI. Common Errors & Pitfall Guide (Lessons Learned)
β Error 1: Declaring "Polyurethane Cement" as 3909.50.50.00 (Resin)
π Consequence: Pay 41.3% instead of 37.1%. Unnecessary 4.2% cost increase.
β Error 2: Vague description "Chemical Material"
π Consequence: Customs assigns highest possible duty + penalties. Delays & Seizures.
β Error 3: Ignoring Section 122 / IEEPA 10%
π Consequence: Underpayment leads to back-taxes + interest. Total 41.3% or 37.1% is mandatory.
β Error 4: Claiming "Adhesive" when product is >90% Raw PU Resin
π Consequence: Customs reclassifies to 3909.50.20.00 or 50.50. Audits & Back-payment.
β Correct Practice:
"Polyurethane-Based Structural Adhesive Cement, Formulated Polymer Binder, Model XYZ, SDS Attached, TSCA Compliant"
π― VII. Conclusion: Precision Classification Saves Money!
π― Remember the Golden Rule:
πΉ "Adhesive (3506) = 37.1% | Resin (3909.50.50) = 41.3%. Choose Adhesive if applicable!"
πΉ "HS Code determines tax, 4% difference is pure profit!"
πΉ "Declare accurately, avoid audits, and secure your margin!"
π Pro Tip:
If your Polyurethane Structural Cement is originated from Vietnam, Mexico, or Thailand, apply for IEEPA Exemption. The tax could drop to 0%~5%.
Recommendation: Always apply for a CBP Advance Ruling before large shipments to lock in the lower 3506 classification.
π£ Immediate Action:
π Contact a certified customs broker + Provide Formula Breakdown + Apply for HS Code Advance Ruling
π Ensure your Polyurethane Structural Cement clears smoothly, efficiently, and profitably!
β¨ Professional Clearance Starts with Accurate Classification!
πΌ Every cent of duty saved is a cent of profit earned!
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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.