Description:
PAN Precursor:

Polyacrylonitrile-based carbon fiber is formed through several stages, including spinning, pre-oxidation, and carbonization of polyacrylonitrile. It features high strength, high stiffness, lightweight, high-temperature resistance, corrosion resistance, excellent electrical properties, and strong compressive and bending capabilities. It has maintained a leading position in reinforced composite materials.

Polyacrylonitrile (PAN), also known as polyethylene cyanide and Creslan 61, is a synthetic semi-crystalline organic polymer resin with the molecular formula (C3H3N)n. Although it is thermoplastic, it does not melt under normal conditions and degrades before melting. If the heating rate is 50°C per minute or higher, it will melt above 300°C. Nearly all polyacrylonitrile resins are copolymers made from a mixture of monomers with acrylonitrile as the primary monomer.

It is a versatile polymer used in the production of various products, including ultrafiltration membranes, reverse osmosis hollow fibers, textile fibers, and oxidized polyacrylonitrile fibers. Polyacrylonitrile fibers are the chemical precursors for high-quality carbon fibers. Polyacrylonitrile is first heat-oxidized in air at 230°C to form oxidized polyacrylonitrile fibers, and then carbonized in an inert atmosphere at temperatures above 1000°C to produce carbon fibers used in various high-tech and everyday applications such as civilian and military aircraft structures, missiles, solid propellant rocket engines, pressure vessels, fishing rods, tennis rackets, and bicycle frames.

It is a repeating unit in several important copolymers, such as styrene-acrylonitrile (SAN) and acrylonitrile-butadiene-styrene (ABS) plastics.

Pitch-based carbon fiber: Pitch-based carbon fiber is made from petroleum pitch or coal tar pitch as raw materials, which are refined, spun, pre-oxidized, carbonized, or graphitized. The production cost of the raw materials is lower than that of PAN-based carbon fiber.

Rayon-based carbon fiber: Rayon-based carbon fiber is obtained through the dehydration, pyrolysis, and carbonization of cellulose-based viscose fibers.

Vapor-grown carbon fiber: Vapor-grown carbon fiber is produced by using benzene, methane, and other raw materials, with iron, cobalt, nickel, and other metal alloys and compounds as catalysts, in a reducing atmosphere with hydrogen gas as the carrier gas.

Item	Unit	1K	3K	6K	12K	25K	35K	50K
Linear Density	g/m	0.118-0.122	0.353-0.367	0.705-0.735	1.470-1.530	2.890-3.010	3.945-4.105	5.635-5.865
Tensile Strength	CN/dtex	≥6.20	≥6.20	≥6.20	≥6.10	≥6.00	≥6.00	≥6.00
Elongation	%	11±2	11±2	13±2	13±2	15±2	15±2	15±2
Oil Content	%	1.5±0.3	1.5±0.3	1.2±0.2	1.2±0.2	1.2±0.2	1.2±0.2	1.2±0.2

Application:

Wind power generation
Automobile lightweight
Rail Traffic
Electronic Instrument
Civil Construction
Aerospace

1.Polyacrylonitrile-based carbon fiber is formed through several stages, including spinning, pre-oxidation, and carbonization, from polyacrylonitrile.
2.It possesses characteristics such as high strength, high stiffness, lightweight, high-temperature resistance, corrosion resistance, and excellent electrical properties.
3.Additionally, it has strong compressive and bending resistance, maintaining a dominant position in reinforced composite materials.
1K, 3K, 6K, 12K, 25K, 35K, 50K

Level Standards	Tow Size (K)	Linear Density g/1000m	Tensile Strength MPa	Tensile Modulus GPa	Elongation %	Density g/cm³	Carbon Content %
GX400	1K	68±3	≥3700
	3K	198±6	≥4000
	6K	396±12	≥4200
	12K	800±20	>4200~4900	≥235	>1.6~2.0	1.77±0.03	≥93
	25K	1600±20
	35K	2100±50
	50K	2580±80
GX700	12K	800±20	>4900	>235	>1.7~2.2	1.77±0.03	>93
	25K	1600±20
	35K	2100±50
	50K	2580±80

Physical Properties:

High Strength: Carbon fiber filaments are extremely strong. A bundle of standard 12k carbon fiber yarns can support approximately 130 kg of weight, which is much stronger than many common metals like steel and aluminum. This high strength makes 12k carbon fiber yarns valuable in structures that need to withstand greater stresses, effectively enhancing the load-bearing capacity of the structure.
Low Density: The density of carbon fiber is only 1/5 that of steel, 2/5 that of titanium, and 3/5 that of aluminum. This means that carbon fiber can provide greater strength and stiffness at the same weight, making it ideal for lightweight applications such as aerospace and automotive manufacturing. It helps reduce the overall weight of structures, improving energy efficiency and performance.
Good Dimensional Stability: The coefficient of thermal expansion of carbon fiber filaments is close to 0, meaning their dimensions remain nearly unchanged between -100°C and +100°C. This characteristic allows 12k carbon fiber yarns to maintain stable size and performance in environments with large temperature fluctuations, making them highly reliable in applications requiring high dimensional accuracy.

Chemical properties:

Corrosion Resistance: Carbon fiber filaments have excellent resistance to corrosion and can withstand various acids, alkalis, salts, and organic solvents. In harsh chemical environments, such as in the chemical industry or marine engineering, 12k carbon fiber filaments can be used for long periods without the risk of corrosion or rusting like metals, extending the service life of structures.
Oxidation Resistance: Carbon fiber filaments also have good resistance to oxidation in high-temperature and oxygen-rich environments. They can resist oxidative reactions to some extent, maintaining their performance stability. This makes carbon fiber filaments advantageous in applications like engine parts, high-temperature pipelines, and other areas exposed to high heat or oxygen.

Characteristics:

Good Processability: Although carbon fiber filaments are a high-performance material, they still exhibit good processability. 12k carbon fiber filaments can be processed into various shapes and structures through weaving, winding, pultrusion, and other techniques to meet different application needs. For example, they can be woven into carbon fiber fabrics for reinforcing building structures, or wound around pipes and containers to enhance strength and corrosion resistance.
Good Compatibility with Matrix Materials: Carbon fiber filaments bond well with matrix materials such as resins, metals, and ceramics to form composite materials. In composites, carbon fiber filaments significantly improve the strength, stiffness, and wear resistance of the matrix. At the same time, the matrix material can protect and support the carbon fibers, thus enhancing the overall performance and service life of the composite material.

Economic Features:

High Cost-Performance Ratio: In small filament bundle carbon fibers, the yield of carbon fiber filaments is relatively high, and the production process is mature, making them cost-effective. Compared to small filament bundles with higher k-values, carbon fiber filaments offer a better balance between performance and price. For applications requiring high performance but with budget limitations, carbon fiber filaments are an ideal choice.
Long Service Life: Carbon fiber filaments have a long service life due to their excellent corrosion resistance, oxidation resistance, and wear resistance. During long-term use, they require minimal maintenance and replacement, reducing operational and maintenance costs, and offering higher economic benefits in the long run.