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1. Short glass fiber reinforced PA66-GF (mass production mainstream solution)
(1) 15%~20% GF PA66 (light-load small auxiliary brackets)
Applicable parts: small side fixing brackets for seats, headrest support bases, wire harness clip brackets, side trim supports for seat backs
Properties: Excellent retained toughness, smooth surface with minimal glass fiber blooming, easy injection molding, balancing appearance and basic rigidity;
Applicable working conditions: Low static load, no severe impact, exposed visible interior parts.
(2) 25%~35% GF PA66 (main grade for full vehicle seat frames, with 33% GF as the most widely used)
Applicable parts: Main support frames of seat backs, cushion base frames, large slide rail mounting brackets, side anti-collision supports, recliner fixing bases
Core properties (benchmark of 33% GF PA66): Tensile strength 180~200MPa, flexural modulus 9000~9800MPa, heat deflection temperature at 1.8MPa ≥250℃, balanced fatigue resistance; low-temperature toughened formulation meets the requirements of vehicles for cold regions;
Advantages: Optimal balance of strength, toughness and processability, a universal standard material for OEMs and a mainstream alternative to aluminum alloy;
Modification matching: Dual modification of low VOC and hydrolysis-resistant toughening to address damp-heat aging and low-temperature brittle cracking inside vehicles.
(3) 40%~45% GF PA66 (heavy-duty special supports)
Applicable parts: Heavy-duty seat bases of new energy vehicles, main load-bearing brackets for commercial vehicles/MPVs, reinforced brackets with child seat interfaces
Features: Ultra-high rigidity and extremely low creep, no deformation under long-term heavy loads; Disadvantage: Reduced toughness, only applied to concealed heavy-load structures rather than exposed components.
2. Long Glass Fiber Reinforced LFT-PA66 (for high-end new energy vehicle seat frames)
With glass fiber lengths ranging from 10 to 15 mm, a continuous three-dimensional reinforcing network is formed. Compared with short glass fiber PA66 of the same filling ratio, its tensile strength is increased by 20% and creep resistance by 40%. It can directly replace thin steel sheets to manufacture integrated full seat back panels for maximum lightweighting performance, and is widely applied in high-end battery electric vehicles. Its drawbacks include higher equipment investment and longer injection molding cycles.
3. Custom Formulas with Special Modifications (for differentiated application requirements)
Toughened modified GF-PA66: Designed for vehicles operated in cold northern regions, it improves low-temperature impact resistance at -30°C to prevent fracture in winter collisions.
Halogen-free low-smoke flame-retardant GF-PA66: Used for new energy vehicle seats, it meets fire protection standards for areas surrounding batteries and achieves UL94 V-2/V0 flame retardancy ratings.
Low-odor and low-fogging special compound: Applied to interior parts of passenger vehicles, it strictly controls volatile organic compounds (VOCs) and passes vehicle-level odor grading tests.
Wear-resistant and self-lubricating modified material: For integrated brackets of seat adjustment mechanisms, it eliminates abnormal noise caused by metal friction without the need for additional grease lubrication.
