Pre-oxidized fiber is an intermediate product in PAN-based carbon fiber production. It is oxidized at ~300°C, has 50–60% carbon content, excellent flame retardancy (LOI ≥ 45), good flexibility, and is more cost-effective than full carbon fiber.
Poly-p-phenylene benzobisoxazole (PBO) fiber is an ultra-high-performance organic fiber with a tensile strength of 5.8 GPa and decomposition temperature ≥ 650°C. It provides outstanding heat and impact resistance.
Combining 92% pre-oxidized fiber with 8% PBO delivers excellent thermal stability and mechanical strength at a lower cost than pure PBO felt.
Fiber Blending and Carding: the fibers are blended in a 92:8 ratio, opened, and carded into a uniform web.
Needle Punching Technology: teedle punching entangles fibers into a dense, durable felt suitable for high-temp use.
Heat Treatment and Surface Finishing: the felt is heat-treated at 200–400°C in an inert atmosphere for dimensional stability. Optional coatings enhance oxidation resistance.
| Parameter | Typical Value |
|---|---|
| Areal Density | 100–1000 g/m² |
| Thickness | 1–10 mm |
| Tensile Strength | ≥50 MPa |
| Long-Term Temp Resistance | 200–300°C (short-term up to 500°C) |
| LOI | ≥50 |
| Thermal Conductivity | 0.05–0.1 W/(m·K) |
| Chemical Stability | Resistant to acids, alkalis, and organic solvents |
High-Temperature Insulation: used in industrial furnace linings, fireproof blankets, and aerospace thermal barriers.
Protective Clothing and Equipment: ideal for firefighting suits, welding protection felts, and military ballistic liners.
Sealing, Friction, and Filtration: applications include high-temp gaskets, brake pad reinforcement, and flue gas filtration in waste incineration plants.
New Energy Applications: reinforces lithium battery separators to improve thermal safety.
This hybrid felt is lightweight, flame-retardant, corrosion-resistant, and cost-effective. However, its lower PBO content means slightly lower mechanical performance than pure PBO textiles.
Market Trends and Future R&D: Manufacturers are increasing PBO content to 10–15% for better strength and are developing ceramic coatings for extreme conditions.
Why Choose Pre-Oxidized Fiber and PBO Felt? This felt provides a balance of cost, performance, and safety for industrial high-temperature insulation, protective equipment, and more.
