High Strength Polybutene Resin
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🏗️ High Strength Polybutene Resin (PB Resin)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
📌 I. Product Definition & Classification: What Exactly Is "High Strength Polybutene"?
Polybutene-1 (PB-1) is a semi-crystalline thermoplastic polymer known for its exceptional chemical resistance, high flexibility, and "cold flow" properties. In international trade, "High Strength Polybutene Resin" typically refers to the raw polymer pellets/granules used as feedstock for extrusion (pipes, films) or molding.
It is crucial to distinguish between the raw resin and the finished articles:
- Raw Resin (Polymers): Unprocessed pellets or granules. This is the most common form for "High Strength Resin."
- Preforms/Masters: Compounded pellets with additives but still raw material form.
- Finished Articles: Pipes, tubing, or molded parts. These are NOT classified under the resin HS codes below.
⚠️ Key Distinction Point:
- If the product is in the form of powder, flakes, or granules/pellets without further processing into specific shapes → Classify under 3901/3907.
- If it is pre-formed pipes, tubes, or valves → Classify under 3917 or 8481.
- Warning: Misclassifying finished pipes as raw resin can lead to severe penalties due to different duty rates and regulatory requirements (e.g., NSF certification for pipes vs. basic polymer declaration for resin).
📦 II. HS Code Classification Details (2026 Latest Tariff Authority对照)
| HS Code | Product Description | Applicable Scenario | Is it Raw Material? |
|---|---|---|---|
3901.90.90.00 |
Polyolefins, primary forms; Others (e.g., Polybutene-1, EB-EPR) | Pure PB-1 resin pellets, unmodified or minimally compounded | ✅ Yes |
3907.90.90.00 |
Polyacetals, polyethers, polysulfones, polyarylates, etc.; Other polymers | If the resin is a specific copolymer or blends not strictly categorized under 3901 | ✅ Yes |
3917.21.00.00 |
Tubes and hoses, rigid, of plastics | Finished rigid PB pipes (e.g., PEX-b, PEX-c) | ❌ No |
3917.23.00.00 |
Tubes and hoses, flexible, of plastics | Flexible PB tubing | ❌ No |
8481.20.00.00 |
Valves, taps, cocks and similar appliances for pipes | PB valve bodies | ❌ No |
🔍 Key Reminder:
- Polybutene-1 (PB-1) is specifically listed under 3901.90 in most international tariff schedules (WCO Harmonized System).
- Do not confuse with Polybutylene Terephthalate (PBT), which falls under 3907.90. Check the Material Safety Data Sheet (MSDS) or TDS for the exact chemical name.
- If the resin is compounded with fibers (e.g., glass fiber reinforced), it may still fall under 3901.90 if the base polymer remains PB-1, but some countries may require specific notes checks.
💰 III. 2026 Latest Tariff Rate Details (Including Additional Duties & Policies)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Date: From November 10, 2025 (including subsequent imports)
🎯 1. 3901.90.90.00 —— Polyolefins, Primary Forms; Others (e.g., Polybutene-1)
| Item | Content |
|---|---|
| Base Duty Rate | 5.3% (ad valorem) |
| USITC Additional Duty (Section 301) | +7.5% (for certain chemical products; check specific footnote for Polybutene) |
| IEEPA Additional Duty | +10% (for Chinese/HK products, effective Nov 10, 2025) |
| Total Duty Rate | ~22.8% (Estimate: 5.3% + 7.5% + 10%)* |
| Tax Calculation | CIF Value × Total Rate |
| De Minimis Exemption Available? | ❌ No (Deny De Minimis for high-value chemical resins) |
| Legal Authority Path | IEEPA:9903.01.25 → USITC:3901.90.90.00 → FOOTNOTE:301 |
📌 Explanation:
- Base Rate (5.3%): Standard USMF (Most Favored Nation) rate for other polyolefins.
- Section 301 Duty: Many chemical intermediates and polymers are subject to additional tariffs. Polybutene often falls under "Other polyolefins." Note: Exact Section 301 rate depends on the specific HTS subheading footnote; assume 7.5% or 25% if listed in Section 301 list.
- IEEPA 10%: A new surcharge on Chinese-origin plastics/polyolefins starting late 2025.
- Total Impact: The total landed duty can exceed 20-30%, significantly impacting cost competitiveness.🔍 Important Note on "High Strength":
- The term "High Strength" is a commercial descriptor, not a technical HS classification term. It does not change the HS code.
- If the resin is regrind or scrap (recycled), it may fall under 3915.90, which has different duties (often higher base rate but potentially exempt from some 301 duties depending on origin). Ensure you are declaring virgin/resin, not scrap.
🛠️ IV. Customs Clearance Practical Advice (Operational Pitfall Guide)
✅ 1. Required Documentation Checklist (No Exceptions)
| Document | Mandatory? | Explanation |
|---|---|---|
| ✅ Product Technical Data Sheet (TDS) | ✔️ | Must show molecular structure, CAS number (e.g., 9003-11-7 for PB homopolymer), and confirm it is PB-1, not PBT or PP. |
| ✅ Material Safety Data Sheet (MSDS/SDS) | ✔️ | Required for DOT/HM (Hazardous Materials) classification, even if non-hazardous. |
| ✅ Commercial Invoice | ✔️ | Clearly state "Polybutene-1 Resin (PB-1), Virgin Granules" |
| ✅ Certificate of Origin (CO) | ✔️ | Essential for proving origin to apply/avoid IEEPA tariffs. |
| ✅ Packing List | ✔️ | Detail net/gross weight, number of bags, and palletization. |
| ✅ Bill of Lading (B/L) | ✔️ | Ensure description matches invoice exactly. |
✅ 2. Declaration Tips (Key Mantra)
🔥 "Raw Resin, Not Finished Pipe; Name Precisely, Avoid Class 3917!"
| Scenario | Correct Declaration | Wrong Practice |
|---|---|---|
| Virgin PB-1 Pellets | 3901.90.90.00 Polybutene-1 Resin |
Declaring as "Plastic Parts" → 3917 (Higher Duty) |
| Compounded PB-1 (with additives) | 3901.90.90.00 (if PB-1 base) |
Declaring as "Chemical Mixture" → 3824 (Complex) |
| Finished PB Pipes | 3917.21.00.00 Rigid Plastic Pipes |
Declaring as "Resin" → Audit Risk & Retention |
| PB Regrind/Scrap | 3915.90.90.00 Plastic Scrap |
Declaring as "Virgin Resin" → Fraudulent Misdeclaration |
✅ 3. Special Situation Handling
| Situation | Handling Advice |
|---|---|
| Blended Resin (PB/PP) | If PB is not the principal polymer, it may not be classified as PB resin. Provide blend ratio. |
| Antioxidant/Stabilizer Added | If additives are <5% by weight, usually still considered "primary form" under 3901. If >5%, consult customs. |
| Hazmat Declaration | While PB resin is generally non-hazardous, ensure the SDS confirms "No Hazardous Materials" to avoid DOT fees. |
| FDA Compliance (Food Contact) | If PB resin is intended for food-grade pipes, provide FDA 21 CFR compliance statement. |
🌍 V. Global Customs Clearance Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Duty Rate (China Origin) | Certification Required | Remarks |
|---|---|---|---|---|
| 🇺🇸 USA | 3901.90.90.00 |
~22-30% (incl. Section 301 + IEEPA) | None for resin | High duty due to 2025 IEEPA policy. |
| 🇪🇺 EU | 3901.90.90 |
6.5% (Base) + Anti-Dumping? | REACH Registration | Check for anti-dumping duties on specific polyolefins. |
| 🇨🇳 China | 3901.90.90 |
6.5% | CCC (if finished goods) | Raw resin generally low tax. |
| 🇬🇧 UK | 3901.90.90 |
5.5% | UK REACH | Post-Brexit rates may vary slightly. |
📌 Conclusion:
- USA imposes the highest effective duty on Chinese-origin Polybutene resin due to recent IEEPA and Section 301 policies.
- EU and China are more cost-effective for imports, provided REACH/CCC requirements are met.
- Consider supply chain diversification if targeting the US market to mitigate IEEPA risks.
📌 VI. Common Mistakes & Pitfall Guide (Lessons Learned)
❌ Mistake 1: Confusing Polybutene (PB) with Polybutylene Terephthalate (PBT)
👉 Consequence: PBT (3907.90) and PB (3901.90) have different duty rates and regulatory requirements. Misclassification leads to back-taxes and fines.
👉 Fix: Verify CAS Number. PB-1: 9003-11-7; PBT: 25038-54-2.
❌ Mistake 2: Declaring Finished Pipes as Resin
👉 Consequence: Customs will detain shipment, require reclassification, and charge higher duties. May lead to fraud allegations.
👉 Fix: Strictly separate raw material imports from finished goods imports.
❌ Mistake 3: Ignoring REACH Registration for EU Imports
👉 Consequence: Shipment blocked at EU border until REACH registration is verified.
👉 Fix: Ensure supplier has valid REACH registration for substances >1 ton/year.
✅ Correct Declaration Example:
"Polybutene-1 (PB-1) Virgin Resin Granules, CAS 9003-11-7, Non-Hazardous, For Pipe Extrusion Use, UN No. N/A"
🎯 VII. Conclusion: Precision Classification, Cost Efficiency, Compliance!
🎯 Remember the Mantra:
🔹 "Resin is 3901, Pipes are 3917; Check CAS Number, Avoid Class Conflict!"
🔹 "US Duties High, Think Before You Ship; EU REACH, Don't Forget to Register!"
📌 Pro Tip:
If your Polybutene resin is destined for the USA, calculate the landed cost including the ~22-30% duty impact. Consider bonded warehouses or foreign trade zones (FTZ) if applicable to defer duties. For finished PB pipes, the duty rate is different, so optimize your supply chain structure (raw material vs. finished good import) based on final assembly location.
📣 Immediate Action:
📞 Contact a licensed customs broker to verify the specific footnote for your HTS subheading in the US.
🚀 Ensure your TDS/MSDS are up-to-date and match the commercial invoice exactly.
💼 Classify accurately to save time, money, and avoid customs delays!
✨ Professional Clearance Starts with Accurate Classification!
💼 Every Percent of Duty Counts in the Chemical Trade!
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关于 HS 编码归类
协调制度（HS）是由世界海关组织（WCO）制定的国际贸易商品分类标准。全球 200 多个国家采用 HS 系统作为海关关税、贸易统计和进出口监管的基础。
每个 HS 编码遵循以下层级结构：
- 章（2 位）——商品大类（例如：第 84 章：机器和机械设备）
- 品目（4 位）——章内的更具体分类
- 子目（6 位）——国际通用细分，所有 WCO 成员国统一使用
- 本国细分（8-10 位）——各国自行扩展的细分编码，如美国 HTSUS 10 位编码
正确的 HS 编码归类对于顺利通关、准确缴纳关税和遵守贸易法规至关重要。错误归类可能导致海关延误、多缴关税或罚款。
从CN进口到US时，适用的关税税率可能包括：
- 最惠国（MFN）税率——适用于 WTO 成员国的标准关税税率
- 普通税率——适用于无贸易协定国家
- 贸易救济关税——附加关税，如 301 条款（反倾销）、232 条款（国家安全）或反补贴税
本页内容仅供参考。如需正式归类，请咨询当地海关或持牌报关代理。