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π§ͺ Polybutene Resin Board Raw Material
π HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Level Entry Strategy
π I. Product Definition & Classification: What Exactly is "Polybutene Resin"?
Polybutene resin is a low molecular weight polyalphaolefin produced from butene-1. It exists as a viscous liquid, paste, or solid depending on its molecular weight. In international trade, raw materials are often misclassified due to confusion with "Polyethylene" (PE) or "Polypropylene" (PP).
Key Distinction:
Polybutene (C4-based): A distinct polymer chain made from butene monomers.
Polyethylene (C2-based) / Polypropylene (C3-based): Different chemical structures with different HS codes.
Physical State Matters:* Liquid/Viscous forms fall under different sub-headings than solid sheets/powders, though many customs authorities group them under the same base code if they are primary forms.
β οΈ Critical Differentiation Point:
- If it is a primary form (liquid, paste, powder, granules, or crude solid blocks) β HS 3901.90 or 3902.90 (depending on polymer type).
- If it is compounded with additives (stabilizers, fillers) for specific industrial use β Still often HS 3901.90 if it hasn't been processed into finished articles.
- NOT "Rubber" or "Plastic Articles" (Chapter 40 or 3904-3926). It is a Basic Polymer.
π¦ II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Application Scenario | Physical State | Chemical Basis |
|---|---|---|---|---|
3901.90.40.00 |
Other primary forms of polyethylene, in irregular shapes or similar bulk forms | Note: Often misused for Polybutene in some databases, but strictly PE. | Solid/Granules | C2 (Ethylene) |
3902.90.00.00 |
Other primary forms of propylene polymers | Note: Strictly PP. | Solid/Granules | C3 (Propylene) |
3901.90.00.00 |
Other primary forms of ethylene polymers | Commonly used for Polybutene in many jurisdictions if not specifically listed. | Liquid/Paste/Solid | C2/C4 Mix |
3824.99.92.00 |
Other prepared binding agents (if highly compounded/additized) | If heavily modified for adhesive use | Viscous Liquid | Complex Mixture |
3906.90.00.00 |
Acrylic polymers in primary forms | Strictly Acrylic. | Solid/Liquid | Acrylic |
π Key Reminder:
- Polybutene is chemically distinct from PE and PP. However, in many national tariff schedules (including US HTS), it falls under 3901.90 ("Other") or sometimes 3902.90 if classified loosely, but the most accurate scientific classification for polybutene often lands in 3901.90 (as an "other ethylene polymer" derivative) or specifically 3906/3907 if mistaken.
- Correction for US HTS 2026: Polybutene is typically classified under HTS 3901.90.40 (Other primary forms of polyethylene) OR 3902.90 if considered a propylene copolymer. However, the most precise global standard for Polybutene is often HS 3901.90 (Other ethylene polymers) or 3902.90 (Other propylene polymers) depending on the specific copolymer ratio.
- For US Imports: The most common and defensible HS Code for Polybutene Resin is 3901.90.40.00 (Other primary forms of polyethylene) or 3902.90.00.00 if viewed as a propylene derivative. See Tax Section for specific US rates.
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: Post-November 10, 2025 (Including subsequent imports)
π― 1. 3901.90.40.00 / 3902.90.00.00 ββ Polybutene / Other Primary Polymers
| Item | Content |
|---|---|
| Base Tariff Rate | 0% (ad valorem) |
| USITC Surtax (Section 301) | +7.5% β 25% (Depends on specific sub-heading and USITC footnote). Note: Many chemical polymers were reduced to 7.5% or removed from 25% list in recent reviews, but verify current IEEPA status. |
| IEEPA Surtax | +10% (On China/HK products, effective Nov 10, 2025) |
| Total Tariff Rate | 17.5% β 35% (Estimate: 0% + 7.5%-25% + 10%) |
| Tax Calculation | CIF Value Γ Total Rate |
| De Minimis Eligibility | β No (deny_de_minimis applies to most chemicals from China) |
| Legal Path | IEEPA:9903.01.25 β USITC:3901.90.40.00 β FOOTNOTE:3901.90 |
π Explanation:
- Base Rate 0%: Most basic polymers have no MFN tariff.
- Section 301 (USITC): Historically 25%, but many plastic resins were moved to 7.5% or exempted in Phase 1/2 reviews. Check current IEEPA list. If not exempt, assume 7.5% or 25%.
- IEEPA 10%: New surcharge on Chinese plastics/polymers.
- Combined Risk: If the 301 rate is 25%, total is 35%. If reduced to 7.5%, total is 17.5%.β οΈ Critical Note for Polybutene:
Some polybutene products may be classified as Prepared Binding Agents (3824.99.92.00) if heavily compounded.
- 3824.99.92.00 Base Rate: 0%
- 301 Surtax: 25% (Chemicals often remain at 25%)
- IEEPA Surtax: 10%
- Total: 35%
- If classified as a "Plastic Article" (e.g., pre-made board), rate jumps to 2.5%-5% base + 25% + 10% = 37.5%+.
π οΈ IV. Customs Clearance Practical Advice (Real-World Pitfall Avoidance Guide)
β 1. Required Documents Checklist (All Must-Has)
| Document | Required | Description |
|---|---|---|
| β Product Specification Sheet | βοΈ | Must include: Molecular weight, viscosity, state (liquid/solid), CAS number (e.g., 9003-27-4 for some polybutenes) |
| β COA (Certificate of Analysis) | βοΈ | From manufacturer showing purity and chemical composition |
| β MSDS (SDS) | βοΈ | Required for safety clearance, especially if liquid/viscous |
| β Commercial Invoice | βοΈ | Must clearly state: "Primary Form Polybutene Resin, Not for Retail Use" |
| β Packing List | βοΈ | Detail net/gross weight, container type (Drums, IBC, Flexitank) |
| β Bill of Lading | βοΈ | Ensure description matches invoice exactly |
β 2. Declaration Tips (Key Mantra)
π₯ "Primary Form, Chemical Name, CAS Number, No Finish!"
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Raw Polybutene Liquid | 3901.90.40.00 - "Polybutene Resin, Primary Form, CAS 9003-27-4" |
Calling it "Plastic Paste" β Misclassification |
| Polybutene Pellets | 3901.90.40.00 - "Polybutene Granules" |
Calling it "Plastic Parts" β Higher Tariff |
| Compounded Adhesive | 3824.99.92.00 - "Prepared Binding Agent" |
Calling it "Resin" β Risk of re-classification |
| Finished Polybutene Sheet | 3920.99.00.00 - "Other Plastic Plates" |
Calling it "Resin" β Wrong Chapter |
π Advice:
- Always include the CAS Number in the description.
- Specify "Primary Form" to distinguish from finished goods.
- If the product is a copolymer, specify the monomer ratio if possible.
β 3. Special Cases Handling
| Scenario | Handling Advice |
|---|---|
| Liquid Polybutene | Use Flexitank or Drums. Ensure IMDG/ADR compliance for transport. |
| High Viscosity Paste | Declare as "Viscous Liquid" or "Paste" to avoid confusion with solid plastic sheets. |
| OEM Private Label | Provide Authorization Letter and Formula Sheet to prove it's a chemical raw material, not a branded consumer good. |
| Used for Adhesives | If primarily used as an adhesive component, consider 3824.99.92.00 but verify if 301 tax is lower/higher. |
π V. Global Main Market Clearance Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff | Certification | Remarks |
|---|---|---|---|---|
| πΊπΈ USA | 3901.90.40.00 |
17.5% - 35% (CN) | None (Chemicals) | IEEPA 10% applies |
| π¨π³ China | 3901.90.40.00 |
0% - 5% | None | Import duty often 0% for raw materials |
| πͺπΊ EU | 3901.90.40.00 |
6.5% | REACH Registration | REACH compliance mandatory |
| π¦πΊ Australia | 3901.90.40.00 |
5% | None | No additional surtaxes |
| π―π΅ Japan | 3901.90.40.00 |
6% | JIS/PSM | No additional surtaxes |
π Conclusion:
- USA has the highest risk due to IEEPA 10% and Section 301.
- EU requires REACH registration for chemicals.
- China has low tariffs, making it a hub for processing.
π VI. Common Errors & Pitfall Guide (Blood & Tears Lessons)
β Error 1: Classifying Polybutene as Polyethylene (3901.10)
π Consequence: If audited, may be reclassified to 3901.90, leading to duty differences and penalties.
π Correction: Use 3901.90 or 3902.90 based on monomer type.
β Error 2: Declaring as "Plastic Sheets" when it is Liquid Resin
π Consequence: HS Code 3920 vs 3901. Tariff and documentation requirements differ significantly.
π Correction: Clearly state "Primary Form" and "Liquid/Paste".
β Error 3: Ignoring REACH for EU Imports
π Consequence: Goods held at customs for REACH compliance check β Delays & Storage Fees.
π Correction: Ensure supplier has REACH Registration or you are the Only Representative.
β Error 4: Missing CAS Number in Declaration
π Consequence: Customs may reject declaration or request additional info β Delay.
π Correction: Always include CAS Number in the product description.
β Correct Practice:
"Polybutene Resin, Primary Form, Liquid, CAS 9003-27-4, Net Weight 1000kg, Used for Adhesive Manufacturing"
π― VII. Conclusion: Professional Declaration, Save Time & Cost!
π― Remember the Mantra:
πΉ "Primary Form, CAS Number, No Finish!"
πΉ "HS Code 3901/3902, Tax 0% Base + Surtax, Declare Clearly!"
πΉ "Liquid/Paste vs Solid, Choose Right Code!"
π Tip:
If your polybutene is imported from Vietnam, Malaysia, or Thailand, check for Free Trade Agreements (FTAs) to reduce Section 301 taxes.
Recommend Advance Ruling if the product is a copolymer with ambiguous monomer ratios.
π£ Immediate Action:
π Contact a licensed customs broker + Provide CAS Number + SDS
π Ensure smooth clearance, avoid delays, and optimize costs!
β¨ Professional Clearance Starts with Accurate Classification!
πΌ Every dollar saved on misclassification is pure profit!
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.