Graphite Rigid Felt
- Rigid Structure for Furnace Hot Zones: Graphite rigid felt is designed for furnace hot zone insulation where a self-supporting structure and dependable shape retention are required for stable long-term operation.
- Excellent Dimensional Stability: Its rigid form helps maintain precise dimensions during repeated thermal cycles, making it suitable for furnace linings, hot zone assemblies and other fixed insulation structures.
- Reliable Heat Retention in High-Temperature Systems: With low thermal conductivity and stable high-temperature performance, graphite rigid felt helps reduce heat loss and improve the thermal efficiency of vacuum furnaces and other industrial furnace systems.
- Suitable for Boards, Cylinders and Shaped Parts: Graphite rigid felt can be processed into boards, cylinders, rings and custom-machined insulation parts to match different furnace layouts and hot zone design requirements.
- Built for Demanding Furnace Conditions: It offers reliable performance in high-temperature environments where thermal shock resistance, structural integrity and long service life are important for furnace maintenance and operational stability.
Description
Graphite Rigid Felt: High-Performance Thermal Insulation
Graphite rigid felt is a rigid high-temperature insulation material developed for furnace hot zones and other thermal areas where structural stability is essential. Compared with soft insulation materials, it is better suited to applications that require a self-supporting structure, dependable shape retention and consistent thermal performance over long operating cycles.
It is commonly processed into boards, cylinders and custom-shaped insulation parts for vacuum furnaces, inert gas furnaces, crystal growth equipment and other high-temperature systems. By combining reliable heat retention with dimensional stability, graphite rigid felt helps improve hot zone efficiency, maintain furnace structure integrity and support long-term operation in demanding thermal environments.
What Is Graphite Rigid Felt?
Graphite rigid felt is a rigid insulation material made from carbon fibre felt that is further processed and reinforced to achieve a stable, self-supporting structure for high-temperature furnace applications. It is designed for use in furnace hot zones where insulation materials must not only reduce heat loss, but also maintain their shape and structural integrity during long-term service.
Unlike soft felt, which is mainly selected for its flexibility and ease of fitting, graphite rigid felt is preferred when a more fixed insulation form is required. It is widely used in rigid furnace linings, hot zone modules, insulation boards, cylinders and other shaped parts where structural reliability and controlled thermal performance are both important.
Key Features & Benefits
Structural Stability for Furnace Hot Zones
Graphite rigid felt is designed for thermal zones where a rigid, self-supporting insulation structure is required. It helps maintain the integrity of furnace linings and hot zone assemblies during extended operation.
Reliable Heat Retention
With low thermal conductivity and stable high-temperature performance, graphite rigid felt helps reduce heat loss and improve the thermal efficiency of furnace systems.
Excellent Dimensional Stability
The rigid structure helps the material retain its shape over time, making it suitable for boards, cylinders and machined insulation parts that require a precise fit.
Resistance to Thermal Shock and Gas Flow Erosion
Graphite rigid felt performs reliably in demanding furnace conditions where repeated heating cycles, strong gas flow or harsh operating environments can affect insulation life.
Available in Machined and Custom Forms
It can be supplied as rigid boards, cylinders, rings and complex shaped parts to match different furnace designs, hot zone layouts and replacement requirements.
Optional Surface Protection and Reinforcement
Additional treatments such as edge sealing, lamination and protective coatings can be applied to improve handling performance, surface stability and service life under specific operating conditions.
TAICHIRON@ Series rigid & Soft insulation
| Product | Bulk Density | Compressiv Strength |
e Thermal Conductivity (@1000℃) |
Ash Purification |
Maximum Operating Temperature |
| PAN-Based | 0.16g/cm³ | 0.25MPa | 0.35W/(m.k) | ≤20ppm | ≥2000℃ |
| PAN-Based | 0.2g/cm³ | 0.35MPa | 0.3W/(m.k) | ≤20ppm | ≥2000℃ |
| Viscose-Based (Long Fiber) |
0.18/cm³ | 0.25MPa | 0.3W/(m.k) | ≤20ppm | ≥2200℃ |
| Viscose-Based (Short Fiber) |
0.15/cm³ | 0.25MPa | 0.25W/(m.k) | ≤20ppm | ≥2200℃ |
Applications for graphite rigid felt
in High-Temperature Industries
Graphite rigid felt is widely used wherever stable, high-temperature insulation is critical. In electronics manufacturing, it provides precise thermal control for circuit board production and component sintering. The semiconductor industry relies on it in crystal growth systems, wafer processing, and vacuum chamber insulation. In the solar photovoltaic sector, it serves as a dependable lining for both polycrystalline casting furnaces and single-crystal growth equipment.
in Thermal Management
It's also a trusted choice for vacuum and inert gas furnaces, offering structural stability and consistent insulation in ultra-high-temperature sintering and brazing. Heat-treatment and induction furnaces benefit from its ability to maintain uniform temperatures, while welding and soldering operations use it as backing strips, heat shields, and work surfaces. In automotive manufacturing, it's applied in high-temperature exhaust linings and other thermal management components where durability and heat resistance are non-negotiable.
Why Choose SHJ CARBON
Technology First
We offer a variety of transmission components
25+ Years of Industry Experience
Proven expertise in carbon and graphite insulation for high-tech manufacturing.
Trusted by Top Manufacturers
Long-term supplier to leading electronics, semiconductor, and solar PV companies.
Custom Engineering Support
Tailored designs in boards, cylinders, and complex 3D shapes to match exact specifications.
Advanced Production & Purification
Secondary high-temperature treatment up to 2800 °C for exceptional purity.
Surface Treatment & Customization Options
Different industries place unique demands on the protection, durability, and thermal performance of graphite felt and rigid felt. For this reason, surface treatment isn't just an add-on - it's a vital step in ensuring the material performs as expected. In applications such as vacuum furnaces, battery insulation systems, or high-temperature processing, the right surface finish can significantly extend service life, improve insulation efficiency, and help minimize particle release in sensitive environments.
|
Surface Treatment Type |
Protection Against Dust |
Airtightness |
Surface Protection |
Shock Resistance |
Key Advantages |
|
No Surface Treatment |
– |
– |
– |
– |
– |
|
Graphite Paper Lamination |
○ |
○ |
○ |
○ |
Good air permeability and low cost |
|
Carbon Cloth Lamination |
○ |
○ |
○ |
○ |
Anti-dust penetration and heat loss |
|
Special Coatings |
◎ |
◎ |
◎ |
◎ |
High protection strength, long service life |
|
Special Coatings (Enhanced) |
◎ |
◎ |
◎ |
◎ |
Anti-dust penetration, high protection performance, high purity |
At SHJ CARBON, we provide a full selection of treatment and customization options. These include edge sealing to reduce particle shedding, corrosion-resistant coatings for aggressive atmospheres, laminated graphite foil layers to increase structural strength, and carbon cloth or graphite foil lamination for added surface stability. We also offer 3D shaping to fit complex furnace designs with precision. From standard finishes to specialized protective coatings, every treatment is tailored to your operating conditions, delivering reliable performance and longer maintenance cycles.
FAQs for Graphite Rigid Felt
Graphite rigid felt manufacturing varies by region. Japan predominantly uses pitch-based materials, Europe and the U.S. favor rayon-based, and China relies on PAN-based products. PAN-based felts are known for their high strength and oxidation resistance, making them ideal for high-temperature applications. Rayon-based felts are more flexible but have lower strength. In single-crystal silicon furnaces, PAN-based felts are often combined with graphite composites for improved erosion resistance and heat stability.
PAN-based felts offer higher mechanical strength, making them ideal for structural stability. Rayon-based felts are better for ultra-high temperatures and provide superior thermal insulation, making them suited for clean environments like crystal growth furnaces.
Graphite rigid felt can last for thousands of cycles in a controlled environment, with factors like temperature and handling influencing its longevity. Proper surface treatments can further extend its service life.
Yes, we offer tailored solutions, including custom shapes (boards, cylinders, and 3D forms) and additional surface treatments such as lamination and corrosion protection to suit your specific needs.
Our MOQ varies based on size and customization. We offer flexible options for both small and large orders, including prototypes and bulk supply agreements.
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