Aramid III high-strength, high-modulus filament used in the tire cord of new energy vehicles
Jul 16,2025
Aramid III Filament
Aramid III filament is a high-performance heterocyclic aramid fiber independently developed in China. It has reached internationally advanced levels in mechanical properties, heat resistance, and overall stability, making it especially suitable for high-end fields such as national defense and aerospace.
Aramid III is a heterocyclic aramid, copolymerized from terephthaloyl chloride, p-phenylenediamine, and benzimidazole monomers. The introduction of a heterocyclic structure significantly improves the molecular chain rigidity and thermal stability. Its filament form uses "denier (D)" to indicate linear density; for example, 1000D means 1000 grams per 9000 meters of fiber, belonging to the category of high-load industrial yarns.
Aramid III 1000D Filament Core Characteristics
Mechanical Properties
Ultra-High Strength and Modulus : Strength exceeding 4,500 MPa, modulus reaching over 139 GPa, suitable for lightweight, high-load structures such as spacecraft and missile casings.
Low Elongation ： Breaking elongation is only 2.9%-3.3%, providing high dimensional stability, but the bonding process with the resin matrix needs optimization to prevent interfacial delamination.
Thermal and Flame Retardant Properties
High Temperature Resistance : Long-term use temperature >200℃, short-term resistance to 560℃, softening point 367-370℃, non-melting in flames and self-extinguishing after removal from flame.
Thermo-Oxidative Stability : Strength retention rate >78% after aging at 250℃ for 192 hours; the heterocyclic structure significantly slows down aging.
Environmental Adaptability
Chemical Resistance : Resistant to organic solvents and salt solutions, but performance degradation requires protection in strong acid/strong alkali environments.
UV Sensitivity : Strength loss of approximately 40% after prolonged exposure to sunlight; coating or composite treatment is required.
Moisture Absorption : Moisture absorption can reach 7%; in a wet state, it can easily affect the interfacial performance of composite materials.
Aramid III 1000D Filament Application Fields
National Defense and Protection
Ballistic Equipment : Multi-layer fabrics are laminated to produce bulletproof vests and helmet liners, combining lightweight and impact resistance.
Firefighting Suits/Special Workwear : Used to produce high-temperature resistant and flame-retardant clothing.
High-End Industry
Optical Cable Reinforcement : As a tensile reinforcement, ensuring a 20-year service life and adapting to extreme climates.
Automotive Components : Tire cords, high-pressure hoses, and battery separators for new energy vehicles, improving wear resistance and thermal stability.
Composite Materials : Spacecraft casings, wound pressure vessels (resin impregnation process needs optimization to improve interlaminar shear strength).
Special Equipment
Climbing ropes, cut-resistant gloves, friction sealing materials, etc.
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