Other Unsaturated Polyester Boards
CN โ US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3907914000 | 40.8% | CN | US | Official Doc |
| 3907915000 | 41.5% | CN | US | Official Doc |
| 3908907000 | 41.5% | CN | US | Official Doc |
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AI Analysis
๐งช Other Unsaturated Polyester Boards (Unsaturated Polyester Resin Boards)
๐ HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Entry Strategy
๐ I. Product Definition & Classification: What Exactly Are "Unsaturated Polyester Boards"?
Unsaturated Polyester Boards are rigid sheets or plates made from Unsaturated Polyester Resins, often reinforced with glass fibers (fiberglass) or other fillers. In international trade, they are classified under Chapter 39 (Plastics and Articles Thereof), specifically as primary shapes of synthetic polymers.
Key Characteristics: * Material: Unsaturated Polyester Resin (a thermosetting polymer). * Form: Boards, Sheets, or Plates (considered "Primary Shapes" in HS classification logic). * Usage: Construction (roofing, cladding), chemical tanks, automotive parts, and industrial flooring.
โ ๏ธ Critical Distinction:
- If the product is a board/plate made of unsaturated polyester, it falls under 3907.91 ("Other polyesters in primary forms").
- If it were a finished article (e.g., a pre-cut car door), it would fall under Chapter 39.16โ39.26.
- Note: One entry in the data incorrectly suggests "Polyimide" (3908.90). This is a material mismatch and should be disregarded unless the product is explicitly Polyimide, not Polyester.
๐ฆ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Logic from Data | Total Tax | Tax Detail Breakdown |
|---|---|---|---|---|
3907.91.40.00 |
Other Polyesters, Primary Forms | "Unsaturated polyester resin" matches material; "Board" is considered a primary shape. Fits "Other" category. | 40.8% | Base: 5.8%, Section 301: 25.0%, Section 122: 10.0% |
3907.91.50.00 |
Other Polyesters, Primary Forms | "Unsaturated polyester resin" matches; "Board" is a physical form; "Other" matches the code category. | 41.5% | Base: 6.5%, Section 301: 25.0%, Section 122: 10.0% |
3907.91.40.00 |
Other Polyesters, Primary Forms | Material "Unsaturated Polyester Resin" + Form "Board" (Primary Shape) perfectly matches "Unsaturated Polyester" & "Other" categories. | 40.8% | Base: 5.8%, Section 301: 25.0%, Section 122: 10.0% |
3907.91.50.00 |
Other Polyesters, Primary Forms | Material "Unsaturated Polyester Resin" matches "Unsaturated Polyester"; "Board" is primary shape, fitting "Other" logic. | 41.5% | Base: 6.5%, Section 301: 25.0%, Section 122: 10.0% |
3908.90.70.00 |
Polyamides (Nylon) & Other Polyamides | โ MISMATCH WARNING: Data claims "Polyimide" matches "Polyamide". Unsaturated Polyester is NOT Polyimide or Polyamide. This classification is highly risky and likely incorrect for Polyester products. | 41.5% | Base: 6.5%, Section 301: 25.0%, Section 122: 10.0% |
๐ Key Insight:
- The two valid HS codes for Unsaturated Polyester Boards are 3907.91.40.00 and 3907.91.50.00.
- The distinction between.40and.50often lies in specific sub-category nuances (e.g., viscosity, reinforcement, or specific manufacturer definitions) not fully detailed in the short summary, but both are valid for "Primary Forms".
- Ignore3908.90.70.00unless you are importing Polyimide (a high-performance plastic), not Polyester. Using this code for Polyester boards constitutes misclassification.
๐ฐ III. 2026 Latest Tariff Rate Breakdown (Including Surcharges & Policy Add-ons)
โ Applicable Country: United States (US)
โ Origin: China (CN)
โ Effective Time: 2025/2026 (Current Trade War Context)
๐ฏ 1. 3907.91.40.00 & 3907.91.50.00 โ Unsaturated Polyester Resins (Primary Forms)
| Item | Content |
|---|---|
| Base MFN Rate | 5.8% (for .40) or 6.5% (for .50) |
| Section 301 Tariff | +25.0% (List 4B/4C inclusion for plastics/resins) |
| Section 122 Tariff | +10.0% (Specific duty on certain Chinese plastics/composites) |
| Total Effective Rate | 40.8% (Code .40) or 41.5% (Code .50) |
| Calculation Basis | CIF Value ร Total Rate |
| De Minimis Exemption? | โ NO (Deny De Minimis) โ Small shipments are NOT exempt from these tariffs. |
| Legal Basis Path | HTSUS: 3907.91.40/50 โ USITC: 301 Tariff โ USTR: Section 122 |
๐ Explanation:
- Base Rate: The standard Most Favored Nation (MFN) duty for unsaturated polyesters.
- Section 301 (25%): The largest component, imposed under US Trade Law to counter unfair trade practices.
- Section 122 (10%): An additional duty often applied to specific categories of Chinese imports, including certain plastic raw materials.
- Total Impact: A ~41% tax burden significantly impacts profitability. Importers must factor this into landed cost calculations.
๐ ๏ธ IV. Customs Clearance Practical Advice (Real-World Pitfall Guide)
โ 1. Required Documentation Checklist (Non-Negotiable)
| Document | Required? | Notes |
|---|---|---|
| โ Product Specification Sheet | โ๏ธ | Must state "Unsaturated Polyester Resin," form (Board/Sheet), and not "Polyimide" or "Nylon". |
| โ Material Safety Data Sheet (MSDS) | โ๏ธ | Proves chemical composition. Ensure it lists "Unsaturated Polyester" and hardener details. |
| โ Commercial Invoice | โ๏ธ | Must clearly describe goods as "Unsaturated Polyester Resin Boards" or "Fiberglass Reinforced Polyester Sheets." |
| โ Packing List | โ๏ธ | Detail weight and dimensions. |
| โ Country of Origin Certificate | โ๏ธ | Essential for applying correct Section 301/122 rates. |
| โ Generic "Plastic Boards" | โ | Do NOT use vague terms. HS codes are strict about polymer type. |
โ 2. Declaration Tips (Critical Keywords)
๐ฅ "Be Specific: Resin Type + Form + Origin"
| Situation | Correct Declaration | Wrong Declaration |
|---|---|---|
| Glass-Reinforced Polyester Board | "Unsaturated Polyester Resin Boards, Fiberglass Reinforced, Primary Form" | "Fiberglass Sheets" (Too vague, may trigger higher scrutiny) |
| Pure Polyester Plate | "Unsaturated Polyester Resin Boards, Non-Reinforced, Primary Shape" | "Plastic Boards" |
| Misclassified as Polyimide | DO NOT USE 3908.90.70.00 for Polyester |
Using 3908 for Polyester = Seizure/Fraud Risk |
โ 3. Special Handling Scenarios
| Scenario | Recommendation |
|---|---|
| Mixed Containers | If containers have both Polyester and Polyimide, separate line items are mandatory. Do not batch under one HS code. |
| Customs Inspection | Be prepared for a lab test to verify resin type. Have the MSDS ready to prove it is not Polyimide (which costs more but has different duties). |
| Duty Reduction Strategy | Check for HTS Exclusions (Exclusion Lists) for Section 301. Some polyester products may have been excluded from the 25% tariff. Verify current USTR exclusion status. |
๐ V. Global Market Comparison (2026 Update)
| Market | HS Code | Tariff (China Origin) | Key Requirement |
|---|---|---|---|
| ๐บ๐ธ USA | 3907.91.40/50 |
~41% (High) | Strict Section 301 & 122 application. |
| ๐จ๐ณ China | 3907.91 |
Low/Zero (Import) | Standard MFN rates apply. |
| ๐ช๐บ EU | 3907.91 |
6.5% | No Section 301 equivalent, but anti-dumping duties may apply to specific resins. |
| ๐ฏ๐ต Japan | 3907.91 |
6.0% | Standard MFN. |
๐ Conclusion:
- The USA is the most challenging market due to the ~41% total tariff.
- EU and Japan are far more competitive with rates around 6-7%.
- Consider supply chain diversification (e.g., sourcing from Vietnam or Mexico) if targeting the US market to avoid Section 301/122 duties.
๐ VI. Common Mistakes & Pitfalls (Lessons Learned)
โ Mistake 1: Using 3908.90.70.00 for Polyester Boards
๐ Consequence: Customs will reject the declaration as "Material Misrepresentation." Polyimide and Polyester are chemically distinct.
๐ Risk: Fines, seizure, and backlog.
โ Mistake 2: Vague Description "Plastic Boards"
๐ Consequence: Customs may assign a higher tariff code by default or request extensive proof, causing delays.
๐ Risk: Delayed clearance, storage fees.
โ Mistake 3: Ignoring Section 122 Tariff
๐ Consequence: Underpayment of duties by 10%.
๐ Risk: Post-audit penalties and back-taxes.
โ Correct Practice:
"Unsaturated Polyester Resin Boards, Reinforced with Glass Fiber, Primary Form, CN Origin, MSDS Attached"
๐ฏ VII. Conclusion: Strategic Importing for Polyester Boards
๐ฏ Key Takeaway:
๐น "Polyester โ Polyimide." Ensure your chemical composition is accurately declared.
๐น "41% is the US Price." Factor in Section 301 (25%) + Section 122 (10%) + Base Duty (~6%).
๐น "Documentation is King." MSDS and precise material descriptions are your best defense against audits.
๐ Pro Tip:
If you are importing large volumes, apply for a Customs Ruling from US CBP to confirm the specific HS sub-heading (.40 vs .50) for your product line. This provides legal certainty and can prevent future disputes.
๐ฃ Action Plan:
๐ Verify with your supplier the exact chemical name (Unsaturated Polyester vs. Polyimide).
๐ Prepare MSDS and Certificate of Origin.
๐งฎ Calculate Landed Cost including ~41% duty.
๐ Consider sourcing from non-China countries if targeting the US market to mitigate trade war risks.
โจ Accurate Classification Saves Thousands!
๐ผ Know Your Polymer, Pay the Right Tax!
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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) โ Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) โ More specific grouping within the chapter
- Subheading (6 digits) โ Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) โ 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 โ The standard duty rate applied to WTO members
- General rate โ Applied to countries without trade agreements
- Trade remedy duties โ 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.