Short Fiber Graphite Rigid Felt
Short Fiber Graphite Rigid Felt is an advanced, high-purity carbon insulation material engineered for superior performance in the most demanding high-temperature processes. Manufactured from rayon-based short fibers, it offers exceptional thermal insulation, minimal thermal mass, and outstanding dimensional stability up to 3000°C in inert or vacuum atmospheres. This material is the preferred choice for critical applications requiring uniform thermal properties and ultra-low contamination, such as Silicon Carbide (SiC) semiconductor substrate production and epitaxial growth furnaces.
Specification of
Short Fiber Graphite Rigid Felt
Our SR4-grade short fiber felt is characterized by its consistent density, high purity, and reliable thermal performance.
Typical Grade Specifications: All values are typical; custom grades available on request.
Certifications:
Size of
Short Fiber Graphite Rigid Felt
We provide versatile sizing and full custom machining capabilities to meet exact furnace designs.
Contact us for a detailed stock list or to discuss your custom size requirements.
What is Short Fiber Graphite Rigid Insulation Felt?
Short Fiber Graphite Rigid Felt is a monolithic, board-like insulation material produced by molding and high-temperature processing a matrix of short, randomly oriented carbon/graphite fibers bonded together. Unlike long fiber felts, which offer higher tensile strength along the fiber direction, the short fiber structure provides a more isotropic, uniform, and fine-grained material. This results in consistent thermal and mechanical properties in all directions, superior surface finish for machining, and minimal risk of delamination, making it perfect for complex, precision-machined hot zone components.
Key Properties of Short Fiber Graphite Rigid Insulation Felt
- Excellent Thermal Insulation: Very low thermal conductivity minimizes heat loss and improves furnace efficiency.
- High Thermal Shock Resistance: Withstands rapid heating and cooling cycles without cracking.
- Ultra-High Purity & Low Outgassing: Rayon-based fiber with ash content <20 ppm (and lower with HP) ensures a clean process environment, crucial for semiconductor growth.
- Excellent Isotropic Properties: Uniform behavior in all directions due to short, random fiber orientation.
- Low Thermal Mass: Enables faster furnace cycling, reducing process time and energy consumption.
- High Dimensional Stability: Low CTE maintains shape and tolerances under extreme thermal cycling.
- Good Machinability: Can be precision-machined into complex geometries with tight tolerances.
Production Process of Short Fiber Graphite Rigid Insulation Felt
The manufacturing process ensures a homogeneous, high-purity, and rigid final product.
- Fiber Preparation: Selected rayon precursor fibers are precisely cut to create short fibers.
- Slurry Formation & Molding: Fibers are mixed with a resin binder to form a slurry, which is then molded into the desired shape (board, cylinder).
- Curing: The binder is cured to provide initial green strength.
- Carbonization & Graphitization: The part undergoes pyrolysis (carbonization) followed by high-temperature treatment (>2400°C) in an inert atmosphere to convert it into a pure graphite structure.
- High-Temperature Purification: Optional Halogen Purification (HP) process to reduce metallic impurities to ultra-low levels (<5 ppm ash).
- Precision Machining: Final CNC machining to achieve exact customer dimensions and tolerances.
Application of
Short Fiber Graphite Rigid Felt
Third-Generation Semiconductors
Primary insulation material for Silicon Carbide (SiC) substrate production and epitaxial induction furnaces.
Traditional Semiconductors
Ideal for silicon crystal growth furnaces (Czochralski) and epitaxial reactors in the PV and electronics industries.
High-Temperature Furnaces
Used in sintering, graphitization, MOCVD, and research furnaces requiring excellent thermal insulation and low outgassing.
Aerospace & Advanced Materials
Components for thermal protection systems and processing of advanced ceramics.
Related Materials and Products
We offer a complete system solution for high-temperature insulation needs.
Graphite Soft Felt