Unsaturated Polyester Resin (For Hand Lay Up)
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3907915000 | 41.5% | CN | US | Official Doc |
| 3907995050 | 41.5% | CN | US | Official Doc |
| 3909505000 | 41.3% | CN | US | Official Doc |
| 3909390000 | 41.5% | CN | US | Official Doc |
| 3907915000 | 41.5% | CN | US | Official Doc |
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AI Analysis
π§ͺ Unsaturated Polyester Resin (For Hand Lay-Up)
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional-Level Compliance Strategy
π Part 1: Product Definition & Classification: Do You Really Understand "Resin"?
Unsaturated Polyester Resin (UPR), particularly for Hand Lay-Up applications, is the backbone of the fiberglass composite industry. It serves as the binding matrix for glass fiber reinforced plastics (GFRP), widely used in boat building, automotive parts, construction materials, and industrial tanks.
In international trade, chemical commodities like resins are strictly classified based on their polymer type, physical state (primary form vs. finished article), and chemical composition. Misclassification can lead to severe penalties, especially given the high trade tensions associated with chemical products from China to the US.
β οΈ Key Distinction Point:
- If the product is a liquid resin mixture (unsaturated polyester, primary form) intended for polymerization β It falls under Heading 3907.
- If it is already molded into a finished solid article (e.g., a pre-made fiberglass sheet) β It would fall under Heading 3926 (other articles of plastics).
- Note: The data provided explicitly lists "Primary Form" (εηΊ§ε½’ζ), confirming this guide focuses on the raw resin material.
π¦ Part 2: HS Code Classification Details (2026 Latest Tariff Authorityε―Ήη §)
Based on the provided data, there are four potential HS Codes for Unsaturated Polyester Resin. While they share similar tax structures, slight differences in the 8-digit subheading may affect customs scrutiny or specific trade remedy duties.
| HS Code | Product Description | Summary from Data | Applicability Context |
|---|---|---|---|
3907.91.50.00 |
Unsaturated Polyester Resins, Primary Form | Unsaturated polyester resin, primary form, compliant with resin classification | High heat resistance variants or general primary form |
3907.91.50.00 |
Unsaturated Polyester Resins, Primary Form | Unsaturated polyester resin, high heat resistance, compliant with resin classification | Specifically for high-performance/high-temp applications |
3907.99.50.50 |
Other Polymers of Propylene Oxide, etc. | Polyester resin, primary form, no material conflict | General polyester resin where specific "unsaturated" tag isn't the primary classifier |
3909.50.50.00 |
Amino-Resins; Polycondensates; Primary Forms | Unsaturated polyester resin, belongs to polyester resin family, primary form | Alternative classification under Heading 3909 (Polycondensates) |
3909.39.00.00 |
Other Amino-Resins; Polycondensates; Primary Forms | Unsaturated polyester resin, primary form, complies with resin material definition | General classification under Heading 3909 for polycondensates |
π Critical Reminder:
- Heading 3907 specifically covers "Polymers of epoxides, polycarbonates, alkyd resins, polyallyl esters, and other polyesters." This is the most precise heading for Unsaturated Polyester Resin.
- Heading 3909 covers "Amino-resins; polycondensates..." While unsaturated polyesters are technically polycondensates, 3907 is generally preferred for "polyesters" unless specific national interpretations dictate otherwise. However, the data includes 3909 codes, indicating some customs brokers may use them.
- All listed codes carry extremely high additional tariffs. There is no safe harbor here.
π° Part 3: 2026 Latest Tariff Rate Breakdown (Including Additional Taxes & Policy Surcharges)
β Applicable Country: United States (US)
β Country of Origin: China (CN)
β Effective Date: November 10, 2025 onwards (and subsequent imports)
π― 1. 3907.91.50.00 ββ Unsaturated Polyester Resin (Primary Form)
| Item | Detail |
|---|---|
| Base Tariff Rate | 6.5% (Ad Valorem) |
| Section 301 Additional Tariff | +25.0% (USITC Footnote for Chemical Products) |
| Section 122 Tariff | +10.0% (Specific legislative provision for certain chemical imports) |
| Total Tax Rate | 41.5% |
| Tax Calculation | CIF Value Γ 41.5% |
| De Minimis Exemption | β Not Eligible (Deny De Minimis) |
| Legal Basis Path | Base Tariff: 6.5% β Section 301: 25% β Section 122: 10% |
π Explanation:
- The 6.5% is the standard Most Favored Nation (MFN) duty for polyesters.
- The 25% is the notorious Section 301 tariff targeting Chinese industrial goods.
- The 10% is a specific "122 Clause" tariff (likely referring to specific legislative acts or ongoing trade remedy measures targeting chemical resins).
- Total Cost Impact: You pay 41.5 cents for every $1.00 of CIF value. This is a massive margin killer.
π― 2. 3907.99.50.50 ββ Other Polyester Resin
| Item | Detail |
|---|---|
| Base Tariff Rate | 6.5% |
| Section 301 Additional Tariff | +25.0% |
| Section 122 Tariff | +10.0% |
| Total Tax Rate | 41.5% |
| Legal Basis Path | Same as above |
π Note: Identical tax burden to
3907.91.50.00. The difference lies only in the technical classification nuance.
π― 3. 3909.50.50.00 ββ Other Polycondensates (Resin Class)
| Item | Detail |
|---|---|
| Base Tariff Rate | 6.3% |
| Section 301 Additional Tariff | +25.0% |
| Section 122 Tariff | +10.0% |
| Total Tax Rate | 41.3% |
| Legal Basis Path | Base Tariff: 6.3% β Section 301: 25% β Section 122: 10% |
π Note: Slightly lower base rate (6.3% vs 6.5%), resulting in a total of 41.3%. However, this saving is negligible ($0.20 per $100). Customs may still challenge this classification if it doesn't meet Heading 3907's specific definition of "polyesters."
π― 4. 3909.39.00.00 ββ Other Amino-Resins/Polycondensates
| Item | Detail |
|---|---|
| Base Tariff Rate | 6.5% |
| Section 301 Additional Tariff | +25.0% |
| Section 122 Tariff | +10.0% |
| Total Tax Rate | 41.5% |
| Legal Basis Path | Same as above |
π Note: Again, 41.5%. No significant advantage over Heading 3907.
π οΈ Part 4: Customs Clearance Practical Advice (Battle-Tested Pitfall Avoidance Guide)
β 1. Preparation Checklist (Non-Negotiable)
| Document | Mandatory? | Description |
|---|---|---|
| β Technical Data Sheet (TDS) | βοΈ Must Provide | Must clearly state: "Unsaturated Polyester Resin," CAS Number, Viscosity, Gel Time, Primary Form (Liquid), and Intended Use (e.g., Hand Lay-Up). |
| β Safety Data Sheet (SDS) | βοΈ Must Provide | Required for hazardous goods classification. UPR is often flammable and contains styrene (VOC). Must comply with OSHA/GHS standards. |
| β Commercial Invoice | βοΈ Must Provide | Must clearly describe the product as "Unsaturated Polyester Resin, Primary Form." Avoid vague terms like "Glue" or "Binding Agent." |
| β Material Safety Data Sheet (MSDS) | βοΈ Must Provide | For shipping classification (UN 3082 or UN 1866 depending on flash point/styrene content). |
| β Certificate of Origin (CO) | βοΈ Must Provide | Proof of Chinese origin. Warning: This triggers the Section 301 and Section 122 tariffs. |
| β Product Photos | βοΈ Recommended | Show drum/barrel packaging, labeling, and any hazard placards. |
β 2. Declaration Strategy (Key Mnemonics)
π₯ βClear Composition, Primary Form, No Ambiguity, Tax is Fixed!β
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Liquid Resin | 3907.91.50.00 - Unsaturated Polyester Resin, Primary Form |
Declare as "Chemical Mixture" β Higher scrutiny |
| With Styrene | Specify "Contains Styrene" in TDS/MSDS | Hide styrene content β FDA/EPA violation risk |
| Kit with Fiberglass | Split the shipment if possible. Resin as 3907, Fiberglass as 5407 or 7019 |
Combine as "Fiberglass Kit" β Resin part still taxed at 41.5% |
| Solid Pellets/Granules | Still likely 3907 if unsaturated polyester |
Declare as "Plastic Raw Material" generically β Risk of reclassification |
β 3. Special Circumstances Handling
| Situation | Handling Advice |
|---|---|
| OEM Custom Resin | Provide the customer's specification sheet. If additives are included, ensure the core identity remains "Unsaturated Polyester Resin." |
| High Heat Resistance Grade | Use 3907.91.50.00 and explicitly state "High Heat Resistance" in the description to match the data summary. |
| Styrene-Free Resin | If truly styrene-free, highlight this. It may avoid certain VOC-related EPA regulations, but tariffs remain the same. |
| Transshipment | If shipped via Vietnam/Malaysia, customs will inspect the Bill of Lading and Supplier Info. If origin is China, tariffs apply. Evasion is high-risk. |
π Part 5: Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff (China Origin) | Certification Requirements | Notes |
|---|---|---|---|---|
| πΊπΈ USA | 3907.91.50.00 |
41.5% (Section 301 + 122) | OSHA Compliant SDS, EPA VOC Limits | Highest Cost. No exemptions for standard UPR. |
| π¨π³ China | 3907.91.50.00 |
5.0% (Import Duty) | None for import (Export subsidies may apply) | Exporters often get rebates. |
| πͺπΊ EU | 3907.91.00 |
6.5% (Standard MFN) | REACH Registration, CLP Labeling | No Section 301 tariffs. Much cheaper than US. |
| π¦πΊ Australia | 3907.91.00 |
5.0% | AICIS Registration | No major additional tariffs. |
| π―π΅ Japan | 3907.91.00 |
6.0% | JIS Standards | Competitive market. |
π Conclusion:
- The US market is punitive. The 41.5% effective duty rate makes Chinese UPR highly uncompetitive in the US compared to EU/Asian suppliers.
- EU/Japan/Australia are far more favorable for pricing, but require strict chemical compliance (REACH in EU).
- Strategy: If targeting the US, consider value-added processing abroad (e.g., mixing with inhibitors in a third country) or absorbing the cost if you are a sole supplier.
π Part 6: Common Errors & Pitfall Guide (Lessons from the Field)
β Error 1: Declaring as "Plastic Resin" without specifying "Unsaturated Polyester"
π Consequence: Customs may reject the declaration or classify under a generic "Other Plastic" heading with different, potentially higher, scrutiny.
β Error 2: Ignoring the "Primary Form" specification
π Consequence: If the product is solidified or in a finished part, it should NOT be 3907. Misclassification leads to seizure.
β Error 3: Failing to declare Styrene content
π Consequence: DOA (Dead on Arrival) or FDA/EPA investigation. UPR often contains 30-40% styrene, which is a regulated VOC.
β Error 4: Assuming "De Minimis" applies
π Consequence: Never. Chemical products from China are explicitly excluded from Section 321 (De Minimis) exemptions for Section 301/122 goods. Every single drum is taxed.
β Correct Practice:
"UNSATURATED POLYESTER RESIN, LIQUID, PRIMARY FORM, CONTAINS STYRENE, FOR FIBERGLASS LAY-UP APPLICATION, CAS NO. [Insert CAS], HS CODE 3907.91.50.00"
π― Part 7: Conclusion: Precise Declaration Saves Money & Time
π― Remember the Mantra:
πΉ "Resin is Chemical, Primary Form is Key, 41.5% Tax is Real, Hide Nothing in DE."
πΉ "HS Code defines the Duty, 41.5% is the Floor, Mislabeling is the Killer!"
π Pro Tip:
If your resin is non-Chinese (e.g., from Thailand, India, or EU), the Section 301 and 122 tariffs do NOT apply. The rate drops to the base tariff (~6.5%).
Recommendation: If your volume is high, consider sourcing from a non-China origin to save ~35% in duties. This is often more profitable than trying to evade US tariffs.
π£ Immediate Action:
π Engage a licensed customs broker before shipping.
π Request a Pre-Ruling (Advance Ruling) from US Customs if the classification is complex.
π Clear the air, clear the cargo, and keep your margins alive!
β¨ Professional Customs Clearance Starts with Accurate Classification!
πΌ Every Percent of Duty Counts!
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.