Corrosion Resistant Polyester Resin Raw Material
CN โ US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 3911904500 | 40.8% | CN | US | Official Doc |
| 3907915000 | 41.5% | CN | US | Official Doc |
| 3907995050 | 41.5% | CN | US | Official Doc |
| 3208100000 | 38.7% | CN | US | Official Doc |
| 3208900000 | 38.2% | CN | US | Official Doc |
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๐ญ Polyester Resin Corrosion Resistant Raw Material: HS Code Guide & Customs Strategy
๐ HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
๐ I. Product Definition & Classification: What Exactly is "Corrosion Resistant Polyester Resin"?
Polyester resin, specifically formulated for corrosion resistance, is a thermosetting polymer widely used in fiberglass-reinforced plastics (FRP), chemical storage tanks, pipelines, and industrial coatings. In international trade, the classification of this raw material depends heavily on its physical state (primary shape vs. prepared product) and its chemical composition (based on specific polymers).
Key Distinction Points: * Primary State (Chapters 39): If the resin is in its raw, unpolymerized, or simply polycondensed form (pellets, flakes, liquids) without specific functional additives for direct painting, it falls under Chapter 39 (Plastics and Articles Thereof). * Prepared/Coating State (Chapter 32): If the resin is already mixed with solvents, catalysts, or other agents to form a ready-to-use paint, varnish, or coating medium, it may fall under Chapter 32 (Tanning or Dye Extracts; Tannins and Their Derivatives; Dyestuffs, Pigments and Other Colouring Matter; Paints and Varnishes).
โ ๏ธ Critical Clarification:
- "Corrosion resistance" is a performance characteristic, not a chemical definition. Customs classifies based on composition and form, not end-use.
- If itโs a pure polymer precursor โ Chapter 39.
- If itโs a prepared paint/coating base โ Chapter 32.
๐ฆ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Classification Logic | Tax Detail Breakdown |
|---|---|---|---|
| 3911.90.45.00 | Polyester resins in primary forms, not elsewhere specified | "ๅ ๅบ็ฑป็ฎ" (Catch-all for Primary Resins): Fits the logic of "unsaturated polyester resins" in primary form, not covered by more specific 3907 subheadings for certain modified types. | Total Tax: 40.8% โข Base Tariff: 5.8% โข Section 301 (25%): Yes โข Section 301 (10% - 122 List): Yes |
| 3907.91.50.00 | Other unsaturated polyester resins in primary forms | "ๅ็บงไบงๅ็นๅพ" (Primary Product Characteristics): Directly classified as "unsaturated polyester" (a subset of acrylic polymers) in primary forms. This is the most common classification for standard raw resin. | Total Tax: 41.5% โข Base Tariff: 6.5% โข Section 301 (25%): Yes โข Section 301 (10% - 122 List): Yes |
| 3907.99.50.50 | Other unsaturated polyester resins in other forms | "ๅ ถไป่้ ฏๅ็ฑป้ป่พ" (Other Polyester Logic): Applies if the resin is in a form not explicitly covered by 3907.91 (e.g., specific blends or secondary forms not defined as "primary"). | Total Tax: 41.5% โข Base Tariff: 6.5% โข Section 301 (25%): Yes โข Section 301 (10% - 122 List): Yes |
| 3208.10.00.00 | Coatings based on unsaturated polyester resins | "ๅบไบ่้ ฏ็่ๅ็ฉๅฑๆง" (Polymer-Based Attribute): Used if the product is a prepared coating (mixed with solvents/additives) where polyester is the main binder. Not a raw material, but a formulated product. | Total Tax: 38.7% โข Base Tariff: 3.7% โข Section 301 (25%): Yes โข Section 301 (10% - 122 List): Yes |
| 3208.90.00.00 | Coatings based on other synthetic polymers | "้ๆฐดไป่ดจๆๅ็ฑป็ฎ" (Non-Aqueous Component Category): A broader catch-all for prepared coatings where the synthetic polymer binder is not specified as acrylic or vinyl in 3208.10. Less precise for pure polyester but applicable if mixed. | Total Tax: 38.2% โข Base Tariff: 3.2% โข Section 301 (25%): Yes โข Section 301 (10% - 122 List): Yes |
๐ Key Insight:
- Raw Resin (Ch39) typically incurs higher total tax (40.8%โ41.5%) due to higher base tariffs, even with similar Section 301 additions.
- Prepared Coatings (Ch32) have lower base tariffs (3.2%โ3.7%) but still carry heavy Section 301 penalties, resulting in slightly lower total tax (38.2%โ38.7%).
- Misclassification Risk: Declaring raw resin as a coating (or vice versa) can lead to customs audits, penalties, and delayed releases.
๐ฐ III. 2026 Latest Tariff Rate Breakdown (Including Surcharges & Policy Add-ons)
โ Applicable Country: United States (US)
โ Origin: China (CN)
โ Effective Date: November 10, 2025 onwards (including subsequent imports)
๐ฏ 1. 3911.90.45.00 โ Polyester Resins (Primary Form, Catch-All)
| Item | Details |
|---|---|
| Base Tariff | 5.8% (ad valorem) |
| Section 301 Surtax | +25% (USITC Footnote 9903.33.01) |
| Section 122 Surtax | +10% (Targeted Chinese products, effective Nov 10, 2025) |
| Total Rate | 40.8% |
| Calculation | CIF Value ร 40.8% |
| De Minimis Eligibility | โ No (Not eligible for Section 321 de minimis exemption) |
| Legal Basis Path | USITC:3911.90.45.00 โ FOOTNOTE:9903.33.01 โ IEEPA:9903.01.25 |
๐ Explanation:
- The 25% surtax applies to all goods under HTS 3911.90.45.00 per Section 301.
- The 10% surtax is part of the updated "List 122" measures targeting specific Chinese industrial chemicals.
- Total burden: 40.8%. This is a high-cost classification.
๐ฏ 2. 3907.91.50.00 โ Unsaturated Polyester Resins (Primary Form)
| Item | Details |
|---|---|
| Base Tariff | 6.5% |
| Section 301 Surtax | +25% |
| Section 122 Surtax | +10% |
| Total Rate | 41.5% |
| Calculation | CIF Value ร 41.5% |
| De Minimis Eligibility | โ No |
| Legal Basis Path | USITC:3907.91.50.00 โ FOOTNOTE:9903.33.01 โ IEEPA:9903.01.25 |
๐ Note:
- This is the standard classification for raw unsaturated polyester resins.
- Even slightly higher base tariff (6.5% vs. 5.8%) makes it the most expensive option in this list.
- Applies to pellets, flakes, or liquid monomers/polyesters intended for further polymerization.
๐ฏ 3. 3907.99.50.50 โ Other Unsaturated Polyester Resins
| Item | Details |
|---|---|
| Base Tariff | 6.5% |
| Section 301 Surtax | +25% |
| Section 122 Surtax | +10% |
| Total Rate | 41.5% |
| Calculation | CIF Value ร 41.5% |
| De Minimis Eligibility | โ No |
| Legal Basis Path | USITC:3907.99.50.50 โ FOOTNOTE:9903.33.01 โ IEEPA:9903.01.25 |
๐ Note:
- Similar to 3907.91.50.00, but for resin forms not explicitly covered in 3907.91.
- Same tax burden. Use only if 3907.91.50.00 is not technically accurate.
๐ฏ 4. 3208.10.00.00 โ Coatings Based on Unsaturated Polyester Resins
| Item | Details |
|---|---|
| Base Tariff | 3.7% |
| Section 301 Surtax | +25% |
| Section 122 Surtax | +10% |
| Total Rate | 38.7% |
| Calculation | CIF Value ร 38.7% |
| De Minimis Eligibility | โ No |
| Legal Basis Path | USITC:3208.10.00.00 โ FOOTNOTE:9903.33.01 โ IEEPA:9903.01.25 |
๐ Note:
- Applies if the product is a prepared coating (e.g., gel coat, marine coating) with solvents/catalysts.
- Lower total tax than raw resin due to lower base tariff.
- Must prove itโs a coating, not raw resin.
๐ฏ 5. 3208.90.00.00 โ Other Coatings Based on Synthetic Polymers
| Item | Details |
|---|---|
| Base Tariff | 3.2% |
| Section 301 Surtax | +25% |
| Section 122 Surtax | +10% |
| Total Rate | 38.2% |
| Calculation | CIF Value ร 38.2% |
| De Minimis Eligibility | โ No |
| Legal Basis Path | USITC:3208.90.00.00 โ FOOTNOTE:9903.33.01 โ IEEPA:9903.01.25 |
๐ Note:
- The lowest total tax in this list.
- Use only if the coating doesnโt fit 3208.10.00.00 precisely.
- High risk of misclassification if declared as raw resin.
๐ ๏ธ IV. Customs Clearance Practical Advice (Real-World Pitfall Avoidance)
โ 1. Required Documentation Checklist (All Mandatory)
| Document | Required | Notes |
|---|---|---|
| โ Product Specification Sheet | โ๏ธ | Must detail chemical composition, polymerization state, and intended use. |
| โ MSDS (Material Safety Data Sheet) | โ๏ธ | Confirms chemical nature; helps distinguish between raw resin and prepared coating. |
| โ Product Photos (Clear & Labeled) | โ๏ธ | Show packaging, labeling, and physical form (pellets, liquid, etc.). |
| โ Third-Party Test Report | โ๏ธ | Certify corrosion resistance properties, but note: performance does not dictate HS code. |
| โ Commercial Invoice | โ๏ธ | Must clearly state: "Unsaturated Polyester Resin" or "Coating Based on Polyester Resin". |
| โ Bill of Lading | โ๏ธ | Ensure consistent description with invoice. |
| โ Certificate of Origin | โ๏ธ | Required for Section 301 determination. |
โ 2. Declaration Tips (Key Mnemonics)
๐ฅ "Form Dictates Code, Not Function. Raw = Ch39, Coated = Ch32."
| Scenario | Correct HS Code | Wrong Action |
|---|---|---|
| Raw polyester resin (pellets/liquid) | 3907.91.50.00 |
Declaring as coating โ 38.2% (but audit risk!) |
| Prepared marine coating (with solvents) | 3208.10.00.00 |
Declaring as raw resin โ 41.5% (overpayment) |
| Mixed with catalysts for immediate use | Likely 3208.10.00.00 |
Declaring as raw resin โ Audit risk |
| Unpolymerized monomers | 3907.91.50.00 |
Declaring as 3907.99.50.50 โ No benefit |
โ 3. Special Case Handling
| Situation | Handling Advice |
|---|---|
| OEM Custom Resin | Provide customer specs + chemical structure to justify 3907.91.50.00. |
| Resin with Catalyst Pre-Mixed | Likely Coating (3208.10.00.00). Declare as such to save ~3.3% tax, but provide proof of mixing. |
| Gel Coat for Boat Hulls | Definitely Coating (3208.10.00.00). Do not declare as raw resin. |
| Raw Resin for Fabrication | Clearly declare as "Unsaturated Polyester Resin, Primary Form" โ 3907.91.50.00. |
๐ V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Total Tariff (China Origin) | Certification Requirements | Notes |
|---|---|---|---|---|
| ๐บ๐ธ United States | 3907.91.50.00 (Raw) / 3208.10.00.00 (Coating) |
41.5% (Raw) / 38.7% (Coating) | None specific | Highest duty burden globally. Section 301 + 122 List applies. |
| ๐จ๐ณ China | 3907.91.00.00 |
~5% | CCC (if applicable) | No Section 301. Much cheaper if importing into China. |
| ๐ช๐บ European Union | 3907.91.00 |
~6.5% | REACH Compliance | No 25% surtax. Much more favorable than US. |
| ๐ฌ๐ง United Kingdom | 3907.91.00 |
~6.5% | UKCA/REACH | Post-Brexit rules apply, but no US-style surtax. |
| ๐ฏ๐ต Japan | 3907.91.00 |
~6.0% | JIS Standards | Moderate duty, no major surtaxes. |
๐ Conclusion:
- The US market is the most expensive for polyester resin imports from China due to Section 301 (25%) and Section 122 (10%) surtaxes.
- EU and Japan offer significantly lower total tariffs (~6โ7%), making them more attractive for cost-sensitive supply chains.
- Considerไพๅบ้พ diversification: If targeting the US, explore sourcing from non-China origins to avoid surtaxes.
๐ VI. Common Mistakes & Pitfall Avoidance (Lessons Learned)
โ Mistake 1: Declaring raw resin as a "coating" to save tax
๐ Consequence: Customs audit, penalty, and potential seizure if proof of mixing/coating formulation is lacking.
โ Mistake 2: Declaring a pre-mixed coating as "raw resin"
๐ Consequence: Overpayment of ~3.3% tax, plus potential penalties for misdeclaration.
โ Mistake 3: Ignoring the "122 List" surtax
๐ Consequence: Failure to include the 10% surtax leads to underpayment and interest/penalties.
โ Mistake 4: Using vague descriptions like "Chemical Resin"
๐ Consequence: Customs may classify under a higher tariff or demand detailed chemical analysis.
โ Best Practice:
"Unsaturated Polyester Resin, Primary Form, Unpolymerized, for FRP Fabrication, No Solvents Added, Model XYZ, MSDS Available."
๐ฏ VII. Conclusion: Precise Classification Saves Money
๐ฏ Remember the Golden Rule:
๐น "Form Dictates Code: Raw = Ch39 (40.8โ41.5%), Coated = Ch32 (38.2โ38.7%)."
๐น "Section 301 + 122 List = +35% surtax on top. Always declare accurately."
๐น "Performance (corrosion resistance) does NOT determine HS code. Composition and form do."
๐ Pro Tip:
If your product qualifies as a prepared coating (Ch32), you can save ~3.3% in total tax compared to raw resin (Ch39). However, you must provide evidence of formulation (MSDS, specs showing solvents/additives).
If itโs raw resin, stick to 3907.91.50.00 to avoid audit risks.
๐ฃ Immediate Action:
๐ Engage a licensed customs broker + Provide MSDS + Product Specs + Apply for Advance Ruling (CBP Ruling) if uncertain.
๐ Ensure smooth clearance, avoid penalties, and optimize your landed cost.
โจ Professional Classification Starts with Precision!
๐ผ Every percent saved in duty is pure profit!
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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.