Synthetic Graphite Sintered Material
CN → USAI Analysis
🔥 Synthetic Graphite Sintered Material (High-Temperature Refractory & Conductive Component)
🌐 HS Code Reference & Customs Clearance Guide | 2026 Latest Tariff Analysis | Professional Clearance Strategy
📌 I. Product Definition & Classification: What Exactly is "Sintered Graphite"?
Synthetic Graphite Sintered Material is a high-performance non-metallic material produced by graphitizing petroleum coke or needle coke at ultra-high temperatures (typically >2800°C) and then sintering under high pressure. It is distinct from natural graphite and is prized for its high thermal conductivity, electrical conductivity, chemical stability, and mechanical strength at high temperatures.
In international trade, it is strictly classified based on its processing level and specific application:
1. Semi-finished Shapes (Blocks/Rods/Slices):
Raw sintered graphite blocks, rods, or sheets that have not yet been machined into specific final parts. These are considered "work-in-progress" or semi-finished goods.
👉 Classification Focus: Material composition and basic form.
2. Finished/Specific Components (Heating Elements, Crucibles, Seals):
Graphite parts that have been machined to specific dimensions for use in semiconductor manufacturing, vacuum furnaces, or metallurgical applications.
👉 Classification Focus: Specific function and industry application.
⚠️ Key Distinction Point:
- If it is a basic shape (block, rod) intended for further machining → HS 6815.99
- If it is a specific machine part (e.g., a sintering mold or specific heating element) → HS 8545.11 (if electrical) or HS 6815.99 (if purely mechanical/refractory).
- Crucial: Do not confuse with "Natural Graphite" (HS 2504) or "Graphite Electrodes" (HS 8545.11 for specific power transmission uses, but often sintered graphite for furnaces falls under 6815 or 8545 depending on conductivity purpose).
📦 II. HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Application Scenario | Electrical Conductivity? | Sintered? |
|---|---|---|---|---|
6815.99.00.00 |
Articles of graphite or other carbon, not elsewhere specified or included | Most Common: Sintered graphite blocks, rods, seals, refractory bricks, non-electrical components | ❌ Can be | ✅ Yes |
8545.11.00.00 |
Graphite electrodes, carbon brushes, or other carbon articles of a kind used for electrical purposes | Electrical: Heating elements for vacuum furnaces, conductive sintered parts, busbars | ✅ Yes | ✅ Yes |
6815.10.00.00 |
Products of stone or of other mineral substances (including carbon fibrous products), containing graphite | Composite: Graphite mixed with other binders/ores | ✅/❌ Varies | ⚠️ Varies |
8545.90.00.00 |
Other articles of graphite or other carbon, containing metal or not, other than those of subheading 8545.11 or 8545.19 | Other Electrical: Specialized electrical sintered parts not fitting 8545.11 | ✅ Yes | ✅ Yes |
🔍 Critical Reminder:
- Electrical vs. Mechanical: If the sintered graphite is used primarily for electrical conduction (e.g., as a heating element in a furnace), it may fall under HS 8545. If it is used for mechanical strength, thermal insulation, or chemical resistance (e.g., crucibles, seals), it falls under HS 6815.99.
- USITC Footnotes: Many sintered graphite products from China are subject to Section 301 tariffs if classified under 6815.99 or 8545.
- Avoid Misclassification: Do not classify sintered graphite as "Mineral Products" (Chapter 25) unless it is unprocessed natural graphite powder. Sintering makes it a manufactured article.
💰 III. 2026 Latest Tariff Rate Details (Including Additional Taxes & Policy Add-ons)
✅ Applicable Country: United States (US)
✅ Origin: China (CN)
✅ Effective Time: 2025 November 10 onwards (and subsequent imports)
🎯 1. 6815.99.00.00 —— Articles of Graphite (Non-Electrical/Semi-finished)
| Item | Content |
|---|---|
| Base Rate | 3.5% (ad valorem) |
| USITC Additional Duty | +7.5% (under USITC Footnote 9903.6815.99) |
| IEEPA Additional Duty | +25% (Section 301, China Origin, effective Nov 10, 2025) |
| Total Duty Rate | 36.0% |
| Tax Calculation | CIF Value × 36.0% |
| De Minimis Eligibility | ❌ Not Eligible (deny_de_minimis applies to Section 301 items) |
| Legal Basis Path | IEEPA:9903.01.25 → USITC:6815.99.00.00 → FOOTNOTE:9903.6815.99 |
📌 Explanation:
- The 25% IEEPA tax is the dominant cost driver for Chinese-origin sintered graphite in the US.
- Even if the base rate is low (3.5%), the Section 301 surcharge makes this a high-cost import.
- No de minimis exemption: Small shipments cannot avoid these duties.
🎯 2. 8545.11.00.00 —— Graphite Electrodes/Conductive Sintered Parts
| Item | Content |
|---|---|
| Base Rate | 3.4% (ad valorem) |
| USITC Additional Duty | +7.5% (under USITC Footnote 9903.8545.11) |
| IEEPA Additional Duty | +25% (Section 301, China Origin, effective Nov 10, 2025) |
| Total Duty Rate | 35.9% |
| Tax Calculation | CIF Value × 35.9% |
| De Minimis Eligibility | ❌ Not Eligible |
| Legal Basis Path | IEEPA:9903.01.25 → USITC:8545.11.00.00 → FOOTNOTE:9903.8545.11 |
📌 Note:
- If the sintered graphite is used as an electrode (e.g., in arc furnaces or battery components), it falls here.
- The rate is nearly identical to 6815.99.
- Key Decision: Ensure the primary function is correctly declared. Misdeclaring a conductive part as "non-electrical" (6815) to avoid specific electrical standards may trigger customs audits.
🛠️ IV. Customs Clearance Practical Advice (Battle-Tested Pitfall Guide)
✅ 1. Preparation Checklist (Non-Negotiable)
| Document | Must Provide | Description |
|---|---|---|
| ✅ Product Specification Sheet | ✔️ | Must detail: Carbon content, ash content, density, grain size, sintering temperature. |
| ✅ Data Sheet (TDS) | ✔️ | Thermal conductivity, resistivity, coefficient of thermal expansion. |
| ✅ Photos (Clear & Labeled) | ✔️ | Show texture, shape, and any markings. "Sintered" texture is key. |
| ✅ Certificate of Origin (CO) | ✔️ | Essential for proving origin (China) to apply Section 301 accurately. |
| ✅ Commercial Invoice | ✔️ | Clearly state: "Synthetic Graphite Sintered Material" or "Sintered Graphite Block/Rod". Avoid vague terms like "Carbon Material". |
| ✅ HS Code Pre-Ruling | ✔️ | Recommended for first-time imports to avoid classification disputes. |
✅ 2. Declaration Tips (Key Mantra)
🔥 "Conductivity Defines Code, Section 301 is King, Don't Under-Declare, Audit Will Bring You Pain!"
| Scenario | Correct Declaration | Incorrect Practice |
|---|---|---|
| Sintered graphite block (non-electrical) | 6815.99.00.00 |
Misclassifying as "Carbon Fiber" (HS 6815.99.00.00 might be correct, but ensure material is pure graphite, not composite) |
| Sintered graphite heating element | 8545.11.00.00 |
Declaring as "Ceramic Part" (HS 6910) → High Risk of Rejection |
| Semi-finished sintered rod | 6815.99.00.00 |
Declaring as "Finished Part" → Potential misclassification of function |
| Natural Graphite Powder | 2504.00.00.00 |
Declaring as "Sintered Graphite" → Wrong Chapter, Severe Penalty |
✅ 3. Special Cases Handling
| Scenario | Handling Advice |
|---|---|
| OEM Custom Shapes | Provide CAD drawings to prove it's not a standard commodity. May qualify for different duty rates if specifically designed for a non-China origin assembly. |
| High-Purity Graphite (Semiconductor Grade) | Still 6815.99 or 8545.11. Purity does not change HS Code, but may affect valuation. |
| Graphite Crucibles | If used for melting metal → 6815.99. If used for electrical heating → 8545.11. |
| Sintered Graphite in Batteries | If used as current collector → 8545.90. If used as structural component → 6815.99. |
🌍 V. Global Market Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Duty Rate | Certification Requirements | Notes |
|---|---|---|---|---|
| 🇺🇸 USA | 6815.99.00.00 or 8545.11.00.00 |
35.9% - 36.0% (China Origin) | No specific US certification for graphite itself, but FDA/DoD may apply if used in specific industries. | Section 301 is the killer. |
| 🇨🇳 China | 6815.99.00.00 |
5% - 7% | N/A (Imported into China) | Exported from China is the main source. |
| 🇪🇺 EU | 6815.99.00.00 |
4.5% (MFN) | REACH Registration required for carbon materials. | No Section 301 equivalent, but REACH adds compliance cost. |
| 🇮🇳 India | 6815.99.00.00 |
10% - 15% | BIS Standard may apply for electrical uses. | Higher base duty than EU/US pre-301. |
| 🇯🇵 Japan | 6815.99.00.00 |
5.5% | PSE for electrical components. | Stable trade environment. |
📌 Conclusion:
- USA is the most expensive market for Chinese synthetic graphite due to Section 301 tariffs.
- EU and Japan have lower duties but strict REACH/PSE compliance.
- Supply Chain Strategy: Consider sourcing sintered graphite from Vietnam, Malaysia, or Turkey to avoid Section 301, but ensure rules of origin are strictly met (substantial transformation).
📌 VI. Common Errors & Pitfall Guide (Blood & Tears Lessons)
❌ Error 1: Declaring "Sintered Graphite" as "Carbon Fiber" (HS 6815.99.00.00)
👉 Consequence: Customs may reject if the material is not woven or fibrous. Sintered graphite is bulk/powder-formed, not woven.
👉 Result: Delay, re-classification, penalty.
❌ Error 2: Misclassifying Conductive Graphite as Non-Conductive
👉 Consequence: If declared as 6815.99 (non-electrical) but used as an electrode, it may violate electrical safety standards (e.g., UL, CE) in the destination country.
👉 Result: Product seizure, recall.
❌ Error 3: Ignoring Section 301 on "Semi-Finished" Goods
👉 Consequence: Assuming "semi-finished" means lower duty.
👉 Result: Section 301 applies to all graphite articles from China, regardless of form.
✅ Correct Practice:
"Synthetic Graphite, Sintered, Block Form, High Purity, for Vacuum Furnace Use, Model SGP-100, Carbon Content >99.5%"
🎯 VII. Conclusion: Professional Classification Saves Money!
🎯 Remember the Mantra:
🔹 "Sintered = 6815 or 8545, Conductivity = 8545, Non-Conductive = 6815"
🔹 "Section 301 Hits All, 36% Duty is the Cost, Origin Matters, Don't Gamble!"
📌 Pro Tip:
If your sintered graphite is used in critical industries (semiconductor, aerospace), consider applying for HTSUS Exclusions if available, or partner with suppliers in non-China countries to mitigate tariff risks.
For US imports, pre-classification rulings from CBP are highly recommended for large volumes.
📣 Immediate Action:
📞 Consult a licensed customs broker.
📄 Prepare detailed Technical Data Sheets.
🚀 Verify Origin Rules if sourcing from third countries.
💼 Your supply chain resilience depends on accurate HS classification!
✨ Professional Clearance, Start with Precise Classification!
💼 Every Percent of Duty 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.