Graphite Felt Insulation For Vacuum Furnace Hot Zones
- Superior Thermal Insulation for Hot Zones: Our graphite felt insulation provides efficient thermal insulation in vacuum furnace hot zones, maintaining consistent temperatures and reducing energy loss.
- Rayon Graphite Felt for High Efficiency: Rayon graphite felt offers superior efficiency compared to PAN graphite felt, ensuring quick temperature adjustments and energy savings in demanding furnace applications.
- Cost-Effective PAN Graphite Felt: PAN graphite felt is a reliable and cost-effective insulation option, providing consistent thermal stability and improving furnace performance without high costs.
- Durability and Chemical Resistance: Graphite felt offers excellent chemical resistance and durability, ensuring long-lasting performance under high-temperature conditions, reducing maintenance needs.
- Expert Graphite Felt Replacement Recommendations: Our experts help you determine when to replace graphite insulation to maintain furnace efficiency, offering tailored solutions and one-stop service for material selection and installation.
Description
Ensure Consistent Thermal Performance with Graphite Felt
At SHJ CARBON, we provide top-tier graphite felt insulation solutions specifically designed for vacuum furnace hot zones. Whether you're operating in a MIM (Metal Injection Molding) application or any high-performance furnace, graphite felt ensures that your furnace maintains stable temperatures, reducing energy loss and optimizing efficiency.
Why Graphite Felt is Essential for Vacuum Furnace Hot Zones
Graphite felt insulation is one of the most important materials in vacuum furnaces, especially in thermal insulation systems. The thermal insulation layer plays a vital role in the furnace's ability to retain heat, thus maintaining consistent processing temperatures. In the hot zone of the furnace, where the highest temperatures are maintained, graphite felt acts as a critical barrier to prevent heat loss and ensure uniform heat distribution.
By using graphite felt, you ensure your furnace performs consistently, keeping the temperature stable and reliable throughout your heating and sintering processes.

TAICHIRON@ Series rigid & Soft insulation
Types of Graphite Felt for Insulation
SHJ CARBON offers two popular types of graphite felt insulation for use in vacuum furnace hot zones: rayon graphite felt and PAN graphite felt. Each offers unique benefits tailored to specific furnace needs.
- Rayon Graphite Felt: This type is known for superior thermal conductivity, which helps maintain uniform heat distribution. It's more efficient than PAN graphite felt, making it ideal for high-performance applications where energy savings and temperature control are critical.
- PAN Graphite Felt: While PAN graphite felt is more affordable, it still offers good thermal performance for many industrial applications, providing excellent insulation properties that reduce heat loss and improve furnace energy efficiency.
Both materials have their own advantages, and SHJ CARBON experts can help you choose the best option based on your furnace's specific requirements.
1. Graphite-Based Rigid Felts
| Grade | Type | Bulk Density (g/cm³) |
Compressive strength (MPa) |
Flexural strength (MPa) |
Vacuum Thermal conductivity 1200℃ (W/m.k) |
Available sizes |
Available Designs |
| TCR-L14 | Rayon Base Long Fiber |
0.14 | 1.00 | 0.80 | 0.39 | 1000x1500mm Thickness Designed to customer request |
Board/Cylinder |
| TCR-S18 | Rayon Base Short Fiber |
0.18 | 1.10 | 1.03 | 0.32 | 1500x1500x250mm | Board/Cylinder/Disk/ Components |
2. Graphite-Based Soft Felts
| Grade | Type | Bulk Density(g/cm³) | Vacuum Thermal conductivity 1000℃ (W/m.k) |
Ash Content (ppm) | Thickness | Application | |
| TCS-20 | Rayon Base Long Fiber |
0.095±10% | 0.13 | ≤100 | 10mm±10% | Thermal Field for Fiber Optics and Quartz Industries |
|
| TCS-21 | 0.095±10% | 0.13 | ≤20 | 10mm±10% | Semiconductor Crystal Growth Furnace Insulation Spare Parts |
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| TCS-22 | 0.095±10% | 0.13 | ≤5 | 10mm±10% | Insulation for Finished Semiconductor Crystal Growth Furnaces |
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| TCS-23 | 0.1±10% | 0.15 | ≤100 | 10mm±10% | General-purpose thermal field material | ||
| TCS-24 | 0.1±10% | 0.15 | ≤20 | 10mm±10% | Insulated Soft Felt for Powder Handling in the Semiconductor Industry |
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How Graphite Felt Enhances Furnace Performance
The graphite felt insulation layer significantly impacts the performance of your vacuum furnace. When used in vacuum heat treatment furnaces, graphite felt helps maintain thermal stability. The low thermal inertia of graphite allows the furnace to reach target temperatures faster, improving overall efficiency and reducing energy costs.
By providing excellent resistance to high temperatures and offering chemical inertness, graphite felt ensures that your furnace operates smoothly, without interference from thermal fluctuations or the buildup of unwanted materials.
When to Replace Your Vacuum Furnace Graphite Felt
Over time, graphite felt in your vacuum furnace will wear out due to normal usage. Typically, after 3-5 years of use, the thermal insulation properties of graphite felt begin to degrade, often due to furnace door opening, corrosion, or heat exposure. Replacing graphite felt insulation when it becomes worn will restore your furnace's efficiency and help maintain temperature uniformity in the hot zone.
If you notice hot spots or uneven temperature distribution in your furnace, it might be time to replace your graphite felt insulation. we have another page detail introduce about hot zone Performance Optimization and Upgrades, please click to this page

Frequently Asked Questions
FAQ 1: What is graphite felt used for in a vacuum furnace?
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Graphite felt is used as an insulation material in vacuum furnaces, helping maintain stable temperatures in the hot zone. It prevents heat loss, ensuring consistent heat distribution for more efficient processing in applications like MIM (Metal Injection Molding).
FAQ 2: How long does graphite felt last in a vacuum furnace?
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Graphite felt insulation typically lasts 3-5 years, depending on the furnace's usage. Over time, it may degrade due to high temperatures and wear, requiring replacement to maintain furnace efficiency and temperature stability.
FAQ 3: Why choose rayon graphite felt over PAN graphite felt?
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Rayon graphite felt is more efficient than PAN graphite felt due to better thermal conductivity, allowing for faster temperature regulation and improved energy efficiency. It's ideal for high-performance applications in vacuum furnaces.
FAQ 4: Can graphite felt help reduce energy costs in my vacuum furnace?
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Yes, graphite felt insulation reduces energy costs by minimizing heat loss and ensuring temperature stability in the vacuum furnace hot zone, resulting in more efficient heating and less energy consumption.
FAQ 5: When should I replace the graphite felt in my vacuum furnace?
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Replace graphite felt when you notice a drop in thermal efficiency or uneven heating in your furnace. Typically, graphite felt needs replacement every 3-5 years due to natural wear and tear.
Why Choose SHJ CARBON for Graphite Felt Insulation?

Powerful Solutions For Business Growth
Ensure your vacuum furnace operates at efficiency with SHJ CARBON's high-quality graphite felt insulation. Contact us today to discuss your specific needs, and let us help you enhance your furnace's performance with the right graphite insulation solution.
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Contact SHJ CARBON for Expert Graphite Felt Insulation Solutions
Ensure your vacuum furnace operates at peak efficiency with SHJ CARBON's high-quality graphite felt insulation. Contact us today to discuss your specific needs, and let us help you enhance your furnace's performance with the right graphite insulation solution.
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