biir 薄膜
CN → US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 4008115000 | 38.3% | CN | US | Official Doc |
| 4008210000 | 35.0% | CN | US | Official Doc |
| 3921190090 | 41.5% | CN | US | Official Doc |
| 3921905050 | 39.8% | CN | US | Official Doc |
| 3920991000 | 41.0% | CN | US | Official Doc |
| 3920992000 | 39.2% | CN | US | Official Doc |
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AI Analysis
🧪 BIIR Film (Butyl Rubber Film) – HS Code Classification & Customs Clearance Guide
🌐 HS Code Reference & Customs Strategy | 2026 Latest Tariff Analysis | Professional Clearance Guide
📌 I. Product Definition & Classification: Do You Really Understand "BIIR Film"?
BIIR (Butyl Rubber) film is a specialized elastomeric material known for its exceptional gas barrier properties, heat resistance, and chemical stability. In international trade, it is primarily used in medical packaging (stopers, seals), automotive inner liners, and industrial lining.
However, classification is NOT straightforward. It depends heavily on: 1. Material Composition: Is it pure硫化 (vulcanized) rubber or a blend with plastics/synthetics? 2. Physical Form: Is it in sheets, rolls, strips, or specific molded shapes? 3. Manufacturing Process: Is it purely rubber or a composite?
⚠️ Key Classification Pitfalls:
- If classified as "Plastic" (Chapter 39) when it's actually "Rubber" (Chapter 40) → High Risk of Rejection & Penalties.
- If classified as "Rubber" but it contains significant plastic polymers → Misclassification Risk.
- Correct HS Code selection directly impacts your tariff burden (ranging from 35% to 41.5%).
📦 II. HS Code Classification Details (2026 Authoritative Mapping)
Based on the provided data, here are the 5 specific HS Codes applicable to BIIR Film, with detailed tax breakdowns.
| HS Code | Product Description | Material Form | Key Characteristics | Total Tax Rate |
|---|---|---|---|---|
| 3920.99.10.00 | BIIR Film, Plastic/Synthetic Rubber blend | Sheet/Film/Foil | Classified under Plastics due to synthetic polymer content | 41.0% |
| 4008.11.50.00 | BIIR Film, Vulcanized Rubber | Sheet | Pure rubber nature, sheet form | 38.3% |
| 3921.19.00.90 | BIIR Film, Synthetic Rubber/Plastic blend | Plate/Sheet/Film | Classified under Other Plastic Products | 41.5% |
| 4008.21.00.00 | BIIR Film, Vulcanized Rubber | Strip/Belt | Matched Success; specific rubber strip form | 35.0% |
| 3921.90.50.50 | BIIR Film, Synthetic Rubber/Plastic blend | Plate/Sheet | Other plastic products, specific composite | 39.8% |
🔍 Critical Insight:
- HS 4008.21.00.00 offers the LOWEST tax (35.0%). This requires the product to be clearly defined as "Vulcanized Rubber in Strip/Belt form".
- HS 3921.19.00.90 has the HIGHEST tax (41.5%). This applies if the product is deemed a "Plastic Product" with rubber/plastic blend.
- Chapter 39 (Plastics) vs. Chapter 40 (Rubber): The core difference lies in whether the material is primarily classified as plastic or rubber by customs experts. Vulcanization is a key indicator for Chapter 40.
💰 III. 2026 Latest Tariff Rate Breakdown (Including Surtaxes)
✅ Applicable Country: USA (US)
✅ Origin: China (CN)
✅ Effective Date: Since Nov 10, 2025 (for subsequent imports)
🎯 1. Lowest Tax Scenario: 4008.21.00.00 – BIIR Film (Vulcanized Rubber, Strip/Belt)
| Item | Content |
|---|---|
| Base Tariff | 0.0% |
| USITC Surtax | +25% (Under Section 301) |
| 122 Clause Tariff | +10% (Specific to this category) |
| Total Tax Rate | 35.0% |
| Tax Calculation | CIF Value × 35% |
| De Minimis Exemption | ❌ Not Available |
| Legal Basis Path | USITC:4008.21.00.00 → Section 301: 25% → Clause 122: 10% |
📌 Explanation:
- This is the most favorable code if your product can be legally described as "Vulcanized Rubber Strip/Belt".
- 0% Base Tax is rare for Chinese goods, but surtaxes still apply.
- Total 35% is significantly lower than the ~41% for plastic-classified films.
🎯 2. Highest Tax Scenario: 3921.19.00.90 – BIIR Film (Synthetic Rubber/Plastic, Plate/Sheet/Film)
| Item | Content |
|---|---|
| Base Tariff | 6.5% |
| USITC Surtax | +25% (Under Section 301) |
| 122 Clause Tariff | +10% |
| Total Tax Rate | 41.5% |
| Tax Calculation | CIF Value × 41.5% |
| De Minimis Exemption | ❌ Not Available |
| Legal Basis Path | USITC:3921.19.00.90 → Section 301: 25% → Clause 122: 10% |
📌 Explanation:
- High Base Tax (6.5%) + Surtaxes = Highest Burden.
- This occurs when customs classifies the film as a Plastic Product (Chapter 39) rather than Rubber.
- Avoid this classification if possible by providing proof of rubber vulcanization.
🎯 3. Mid-Range Scenarios: Other HS Codes
| HS Code | Total Tax | Base Tariff | Surtax (301) | 122 Clause |
|---|---|---|---|---|
| 3920.99.10.00 | 41.0% | 6.0% | +25% | +10% |
| 4008.11.50.00 | 38.3% | 3.3% | +25% | +10% |
| 3921.90.50.50 | 39.8% | 4.8% | +25% | +10% |
📌 Note:
- All scenarios include 25% Section 301 Surtax and 10% 122 Clause Tariff.
- The difference comes from the Base Tariff (0% to 6.5%) and whether it’s Chapter 39 (Plastic) or 40 (Rubber).
🛠️ IV. Customs Clearance Practical Advice (Expert Pitfall Guide)
✅ 1. Documentation Checklist (Non-Negotiable)
| Document | Required? | Explanation |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Must clearly state: Material (Butyl Rubber/Biir), Process (Vulcanized/Unvulcanized), Form (Sheet/Strip/Film) |
| ✅ Material Composition Report | ✔️ | Third-party lab report proving rubber content vs. plastic content |
| ✅ Product Photos | ✔️ | Clear images of the film, showing texture, thickness, and roll/sheet form |
| ✅ Commercial Invoice | ✔️ | Must match HS Code description precisely. Do NOT use vague terms like "Rubber Film" |
| ✅ Certificate of Origin (CO) | ✔️ | Required for surtax calculation |
| ✅ Customs Ruling (Pre-Ruling) | ✔️ | Highly Recommended to lock in HS Code before shipment |
✅ 2. Declaration Tips (Key Strategy)
🔥 "Clarify Vulcanization, Specify Form, Choose Chapter 40 if Possible!"
| Scenario | Correct Declaration | Incorrect Declaration | Consequence |
|---|---|---|---|
| Vulcanized Rubber Strip | 4008.21.00.00 |
"Plastic Film" | 35% Tax ✅ |
| Rubber/Plastic Blend Sheet | 3921.19.00.90 |
"Vulcanized Rubber" | 41.5% Tax |
| General BIIR Film | 4008.11.50.00 |
"BIIR Film" | 38.3% Tax |
📌 Pro Tip:
- If your BIIR film is predominantly rubber, argue for Chapter 40 (Rubber).
- If it contains significant plastic polymers, prepare for Chapter 39 (Plastic).
- Always specify the physical form (Sheet, Strip, Film) in the declaration.
✅ 3. Special Cases & Solutions
| Case | Solution |
|---|---|
| OEM Custom BIIR Film | Provide customer spec sheet + material composition proof to support Chapter 40 classification |
| BIIR Film with Plastic Lining | If the plastic layer is minimal, still argue for Chapter 40; if major, Chapter 39 is safer |
| Rolls vs. Sheets | "Strip/Belt" (4008.21.00.00) has the lowest tax. If you can cut/shape into strips, declare as such |
| Medial Grade BIIR | Ensure FDA compliance docs are included to avoid regulatory holds |
🌍 V. Global Market Comparison (2026)
| Market | Recommended HS Code | Total Tax (China Origin) | Key Certification |
|---|---|---|---|
| 🇺🇸 USA | 4008.21.00.00 (Best) |
35.0% | None specific |
| 🇨🇳 China | 4008.21.00.00 |
15% (Est.) | CCC (if applicable) |
| 🇪🇺 EU | 4008.11.00 |
3.9% (Est.) | REACH, RoHS |
| 🇬🇧 UK | 4008.11.00 |
3.9% (Est.) | UKCA |
| 🇯🇵 Japan | 4008.11.00 |
4.5% (Est.) | JIS |
📌 Conclusion:
- USA has the highest effective tax rate due to 301 and 122 clauses.
- Choosing the right HS Code (Chapter 40 vs. 39) saves 6-7% in taxes.
- Pre-Ruling is essential to avoid post-import audits and back-taxes.
📌 VI. Common Mistakes & Pitfalls (Lessons Learned)
❌ Mistake 1: Declaring "BIIR Film" without specifying Vulcanization
👉 Consequence: Customs may default to Chapter 39 (Plastic) → 41.5% Tax instead of 35%
❌ Mistake 2: Using "Plastic Film" for a predominantly rubber product
👉 Consequence: Audit Risk, Potential Fraud Charges, and Back-Taxes
❌ Mistake 3: Not providing Material Composition Report
👉 Consequence: Customs cannot verify Chapter 40 eligibility → Delayed Clearance
❌ Mistake 4: Assuming all BIIR films are the same
👉 Consequence: Misclassification → Penalties + Interest
✅ Correct Approach:
"BIIR Film, Vulcanized Butyl Rubber, Strip Form, 0.5mm Thickness, For Medical Sealing"
🎯 VII. Conclusion: Precise Classification, Maximized Savings!
🎯 Key Takeaways:
🔹 "Vulcanized = Chapter 40 = Lower Tax"
🔹 "Plastic Blend = Chapter 39 = Higher Tax"
🔹 "Strip Form = 35% Tax | Sheet Form = 38-41% Tax"
🔹 "Pre-Ruling is Your Best Friend"
📌 Action Items:
- Get a Material Composition Report from your supplier.
- Consult a Customs Broker to determine if Chapter 40 is defensible.
- Apply for a Pre-Ruling from US Customs and Border Protection (CBP) if the product value is high.
- Clearly Describe the product as "Vulcanized Rubber" if applicable.
📣 Immediate Action:
📞 Contact your freight forwarder + Provide Material Data + Request HS Code Confirmation
🚀 Avoid the 41.5% Trap, Target the 35% Sweet Spot!
✨ Professional Clearance Starts with Accurate Classification!
💼 Every Percent Saved 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) — Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) — More specific grouping within the chapter
- Subheading (6 digits) — Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) — 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 — The standard duty rate applied to WTO members
- General rate — Applied to countries without trade agreements
- Trade remedy duties — 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.