天然橡胶发泡橡胶绝缘板
CN → US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 4005910000 | 35.0% | CN | US | Official Doc |
| 4005990000 | 35.0% | CN | US | Official Doc |
| 4008111000 | 35.0% | CN | US | Official Doc |
| 4008115000 | 38.3% | CN | US | Official Doc |
AI Analysis
🧱 Natural Rubber Foamed Insulating Boards (海绵橡胶/泡沫橡胶绝缘板)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Transit Strategy
📌 I. Product Definition & Classification: Do You Really Understand "Rubber Boards"?
Natural Rubber Foamed Insulating Boards are specialized rubber products made from natural rubber, processed into a foamed/porous structure (sponge rubber) and formed into sheets/plates. In international trade, their classification hinges on two critical factors: 1. Material Composition: Pure natural rubber vs. blended/synthetic. 2. State of Vulcanization: Unvulcanized (raw/milled) vs. Vulcanized (finished/flexible).
⚠️ Key Distinction Points:
- If the rubber is unvulcanized (raw, pliable, requires further processing) → Falls under Chapter 4005 (Unvulcanized Rubber).
- If the rubber is vulcanized (finished, elastic, ready-to-use insulating sheets) → Falls under Chapter 4008 (Vulcanized Rubber Sheets).
- Foamed/Sponge Rubber is treated as a specific physical form within these chapters.
📦 II. HS Code Classification Details (2026 Latest Tariff Authority Cross-Reference)
| HS Code | Product Description | Application Scenario | Vulcanization State | Total Tax Rate |
|---|---|---|---|---|
4005.91.00.00 |
Unvulcanized composite rubber (containing natural rubber), in slabs, sheets, or strips | Raw rubber slabs for further manufacturing; industrial mixing | ❌ Unvulcanized | 35.0% |
4005.99.00.00 |
Other unvulcanized rubber (mixed/blended), in slabs/sheets/strips | Generic unvulcanized rubber sheets; no specific natural rubber dominance | ❌ Unvulcanized | 35.0% |
4008.11.10.00 |
Vulcanized rubber plates, sheets, or strips, of open-cell foam or cellular rubber | Finished insulating sponge mats; acoustic dampening panels | ✅ Vulcanized | 35.0% |
4008.11.50.00 |
Vulcanized rubber plates, sheets, or strips, of cellular foam, other | Premium foamed rubber insulation; high-density sponge boards | ✅ Vulcanized | 38.3% |
🔍 Key Reminder:
- "Foam" (海绵/泡沫) in the product name directly maps to "cellular foam" (泡沫橡胶) in HS Code 4008.11.
- "Unvulcanized" (未硫化) maps to HS Code 4005.
- Misclassification Risk: Declaring a finished vulcanized sponge board as "unvulcanized" to avoid higher taxes is a common customs violation.
💰 III. 2026 Latest Tariff Rate Breakdown (Including Surcharges & Policy Add-ons)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Date: November 10, 2025 (and subsequent imports)
🎯 1. 4005.91.00.00 & 4005.99.00.00 —— Unvulcanized Natural Rubber Boards
| Item | Content |
|---|---|
| Base Rate | 0% (ad valorem) |
| USITC Surcharge | +25% (from USITC Footnote 9903.88.01 under Section 301) |
| IEEPA Surcharge | +10% (for China/HK products, effective Nov 10, 2025) |
| Total Rate | 35.0% |
| Tax Calculation | CIF Value × 35% |
| De Minimis Eligibility | ❌ Not Eligible (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:4005.xxxx → FOOTNOTE:9903.88.01 |
📌 Explanation:
- These codes cover raw, unvulcanized rubber. If your product is a finished insulating sheet, do not use these codes.
- The 35% total rate applies to unvulcanized natural rubber imports from China.
🎯 2. 4008.11.10.00 —— Vulcanized Open-Cell Foam Rubber Boards
| Item | Content |
|---|---|
| Base Rate | 0% (ad valorem) |
| USITC Surcharge | +25% (from USITC Footnote 9903.88.01 under Section 301) |
| IEEPA Surcharge | +10% (for China/HK products, effective Nov 10, 2025) |
| Total Rate | 35.0% |
| Tax Calculation | CIF Value × 35% |
| De Minimis Eligibility | ❌ Not Eligible (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:4008.11.10.00 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- This code is for vulcanized (finished) foamed rubber.
- "Open-cell foam" is explicitly mentioned. Most "sponge rubber" (海绵橡胶) falls here.
- Total 35% is the standard rate for finished foamed rubber insulation from China.
🎯 3. 4008.11.50.00 —— Vulcanized Cellular Foam Rubber Boards (Other)
| Item | Content |
|---|---|
| Base Rate | 3.3% (ad valorem) |
| USITC Surcharge | +25% (from USITC Footnote 9903.88.01 under Section 301) |
| IEEPA Surcharge | +10% (for China/HK products, effective Nov 10, 2025) |
| Total Rate | 38.3% |
| Tax Calculation | CIF Value × 38.3% |
| De Minimis Eligibility | ❌ Not Eligible (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 → IEEPA:9903.01.24 → USITC:4008.11.50.00 → FOOTNOTE:9903.88.01 |
📌 Explanation:
- This is the "catch-all" for cellular foam rubber that doesn't fit the "open-cell" description or has other specific characteristics.
- The base rate is higher (3.3%), leading to a 38.3% total rate.
- Use this only if4008.11.10.00is definitively incorrect based on foam structure (e.g., closed-cell vs. open-cell distinctions).
🛠️ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Avoidance Guide)
✅ 1. Required Documentation Checklist (None Can Be Omitted)
| Document | Mandatory? | Notes |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Must detail: Natural Rubber content %, Foam density (kg/m³), Open-cell/Closed-cell status, Dimensions. |
| ✅ Material Safety Data Sheet (MSDS) | ✔️ | Proves composition and hazard classification. |
| ✅ Product Photos (Clear & Detailed) | ✔️ | Show texture (foam structure), edges, and any markings. |
| ✅ Commercial Invoice | ✔️ | Must state: "Vulcanized/Closed-cell/Open-cell Foam Rubber Board" – avoid vague "Rubber Sheet". |
| ✅ Packing List | ✔️ | Weight and dimensions per package. |
| ✅ Certificate of Origin (CO) | ✔️ | Essential for proving CN origin; triggers surcharges. |
✅ 2. Declaration Tips (Key Mantras)
🔥 "State State State: Vulc or Unvulc, Foam Type, Natural Content!"
| Scenario | Correct Declaration | Wrong Approach |
|---|---|---|
| Finished Sponge Board (Insulation) | 4008.11.10.00 + "Vulcanized Open-Cell Foam Rubber" |
Declare as 4005.xxxx → Misclassification Penalty |
| Raw Rubber Slab (Unfinished) | 4005.91.00.00 + "Unvulcanized Natural Rubber Slab" |
Declare as 4008.xxxx → Wrong Tax Base |
| Mixed Rubber (Synthetic + Natural) | 4005.99.00.00 or 4008.19.xxxx |
Claim 100% Natural → Customs Audit |
| Thin Rubber Mat (Not Foam) | 4008.19.00.00 (Non-foam) |
Claim "Foam" → Rate Increase to 38.3% |
✅ 3. Special Handling Cases
| Situation | Handling Advice |
|---|---|
| "Sponge" vs. "Foam" Terminology | Use official HS terminology: "Cellular Foam Rubber" or "Open-Cell Foam". "Sponge" is informal; use it in description but align HS code with "Foam". |
| Mixed Materials | If >50% natural rubber, it qualifies for natural rubber codes. If synthetic dominates, rates may change (check synthetic rubber tariffs). |
| Thickness < 3mm | Some thin foams may fall under different subheadings. Verify exact thickness. |
| Recycled Rubber | Must declare as "Recycled". Different HS code (4004.00.00.00) with 45%+ tax. Do not misdeclare as "Natural Rubber". |
🌍 V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff Rate | Certification | Notes |
|---|---|---|---|---|
| 🇺🇸 USA | 4008.11.10.00 |
35.0% | None Specific | High surcharges apply. |
| 🇨🇳 China | 4008.11.10.00 |
5% (Import) | CCC (if applicable) | No surcharges. |
| 🇪🇺 EU | 4008.11.10.00 |
0-6.5% | REACH | No US-style surcharges. |
| 🇯🇵 Japan | 4008.11.10.00 |
0-6.0% | JIS | Free Trade Agreement (EPA) may apply. |
📌 Conclusion:
- USA is the most expensive market due to 35% total rate.
- EU and Japan are significantly cheaper (0-6.5%).
- Consider supply chain diversification if US tariffs are prohibitive.
📌 VI. Common Errors & Pitfall Guide (Lessons Learned)
❌ Error 1: Declaring Vulcanized foam as Unvulcanized (4005 vs 4008)
👉 Consequence: Customs reclassification → Back taxes + Penalties.
👉 Correction: Ensure product is physically unvulcanized (sticky, unelastic) for 4005.
❌ Error 2: Calling it "Rubber Mat" instead of "Foam Rubber Board"
👉 Consequence: Ambiguity leads to highest possible duty (38.3% or more).
👉 Correction: Use precise HS language: "Cellular Foam".
❌ Error 3: Ignoring Open-Cell vs. Closed-Cell distinction
👉 Consequence: 4008.11.10.00 (35%) vs 4008.11.50.00 (38.3%).
👉 Correction: Test foam structure. Open-cell = breathes; Closed-cell = waterproof.
❌ Error 4: Failing to declare Natural Rubber Content
👉 Consequence: Customs assumes synthetic or mixed → higher base rates.
👉 Correction: Provide lab report showing % Natural Rubber.
✅ Correct Declaration Example:
"Vulcanized Open-Cell Foam Rubber Board, Natural Rubber Based, Insulating Use, 50mm Thickness, Model XYZ, CE Certified"
🎯 VII. Conclusion: Precise Classification Saves Money!
🎯 Remember the Mantras:
🔹 "Vulcanized = Foam (4008), Unvulcanized = Slab (4005)"
🔹 "Open-Cell is 35%, Other Foam is 38.3%"
🔹 "Natural Rubber is Key; Don't Mix Without Proof"
📌 Pro Tip:
If your product is 100% Natural Rubber Open-Cell Foam, use 4008.11.10.00 for the lowest possible 35% rate.
For closed-cell or mixed foams, expect 38.3%.
📣 Immediate Action:
📞 Consult a licensed customs broker
📦 Prepare foam structure test reports
🚀 Clear Customs Efficiently, Minimize Costs!
✨ Professional Clearance Starts with Accurate Classification!
💼 Every Percent of Tax Matters!
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) — 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.