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Hebei Carbon Valley Carbon Fiber Co., Ltd

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Manager Zhao (Composite Products): 13944687090

Address: 226 Shifu East Road, Gaocheng District, Shijiazhuang City, Hebei Province

What are the main raw materials for carbon fiber production?

2026-01-10 14:30:35

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The main raw materials for carbon fiber production are called precursors—organic polymers that can be converted into carbon-rich fibers through high-temperature carbonization and graphitization. These precursors determine the final performance, cost, and application scope of carbon fibers. Below are the three mainstream precursors used in industrial production, along with their characteristics and application scenarios:

1. Polyacrylonitrile (PAN) – The Most Dominant Precursor (≈90% of Global Production)

PAN is a synthetic polymer resin, and PAN-based carbon fibers account for the vast majority of industrial and aerospace-grade carbon fiber supply.

Why it’s mainstream: It has a high carbon yield (50–60% after carbonization, higher than other precursors), and the resulting carbon fibers boast an excellent balance of tensile strength and modulus. The manufacturing process is mature and controllable, making it suitable for mass production.

Industrial processing: PAN is first spun into continuous filaments (via wet spinning, dry spinning, or dry-jet wet spinning). These filaments are then stretched, stabilized (oxidized at 200–300°C), carbonized (1000–1500°C), and optionally graphitized (2000–3000°C) to form carbon fibers.

Applications: Covers almost all carbon fiber scenarios—wind turbine blades, automotive lightweight parts, aerospace structures, sports equipment, and industrial pressure vessels.

2. Pitch – High-Modulus Precursor for Specialized Scenarios

Pitch is a viscous, carbon-rich byproduct from petroleum refining or coal tar processing. It is divided into isotropic pitch and mesophase pitch, with mesophase pitch being the primary raw material for high-performance carbon fibers.

Key advantage: It has an extremely high carbon yield (up to 80–90%) and can produce carbon fibers with ultra-high tensile modulus (450–900 GPa), far exceeding PAN-based carbon fibers. However, its tensile strength is relatively lower.

Industrial processing: Pitch is first heated to form a liquid crystalline (mesophase) structure, then spun into filaments, stabilized, carbonized, and graphitized. The highly oriented molecular structure of mesophase pitch gives the final fibers exceptional stiffness.

Applications: Targeted at high-stiffness, low-deformation needs—satellite antenna supports, high-precision instrument frames, heat-dissipating components, and military aerospace equipment.

3. Rayon (Viscose) – Traditional Precursor with Limited Use

Rayon is a regenerated cellulose fiber made from wood pulp or cotton linters. It was the first precursor used for carbon fiber production (dating back to the 1950s).

Drawbacks: Low carbon yield (only 20–30%), complex manufacturing process, and the resulting carbon fibers have lower strength and modulus compared to PAN and pitch-based alternatives.

Remaining applications: Mostly limited to high-temperature resistant scenarios (e.g., fire-resistant fabrics, thermal insulation materials for industrial furnaces) because rayon-based carbon fibers have good thermal stability and low thermal conductivity.

Auxiliary Raw Materials in Production

In addition to the core precursors, several auxiliary materials are essential for industrial carbon fiber manufacturing:

Stabilization auxiliaries: Oxidants or catalysts to accelerate the oxidation of precursor filaments during the stabilization stage, improving production efficiency.

Surface treatment agents: Chemicals (e.g., epoxy sizing agents) applied to carbon fiber surfaces to enhance bonding with resin matrices in prepreg production.

Process gases: Inert gases (nitrogen, argon) for the carbonization and graphitization stages to prevent fiber oxidation at high temperatures; oxidizing gases (air) for the stabilization stage.

Carbon Fiber,Pre-oxidized Fiber,Carbon Fiber Prepreg