At Tianjin Fortune, we specialize in high-performance polyimide films and tapes designed to meet the most demanding requirements of modern industry. Our products offer exceptional thermal stability, electrical insulation, and chemical resistance.
With over 20 years of manufacturing excellence, we provide a wide range of standard and custom solutions for electronics, aerospace, automotive, and power industries worldwide.
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Polyimide film coated with FEP adhesive offers excellent high-temperature resistance, chemical stability, and strong bonding.…
View DetailsOur Polyimide Film With FEP Coated (F46) is a high-performance composite insulation material. It is manufactured by coating a standard polyimide film base with a thin, uniform layer of FEP (Fluorinated Ethylene Propylene) resin on one side (single-sided FEP) or both sides (double-sided FEP). While the polyimide core provides high-temperature mechanical integrity and robust dielectric strength, the FEP coating functions as a specialized hot-melt adhesive that melts and fuses at high wrapping temperatures, creating a seamless, void-free, and moisture-impermeable insulation barrier.
For heavy electrical engineering and industrial machinery, standard tapes can slip or allow moisture ingress over time. The heat-sealable nature of F46 polyimide film makes it highly suitable for wrapping magnet wires, high-voltage cables, and traction motor windings. During the heat treatment phase of wire manufacturing, the FEP coating fuses together to form a solid, continuous sheath. This prevents the entry of oil, water, and corrosive solvents, safeguarding critical windings in locomotives, wind turbines, and industrial generators.
We maintain strict quality control across our manufacturing facilities to ensure that our Polyimide Film With FEP Coated meets rigorous international standards. Our F46 films are fully compliant with RoHS, REACH, and UL regulations, making them easy to integrate into European and North American supply chains. We offer standard thickness variations (ranging from 0.03mm to 0.15mm) with a strict thickness tolerance of plus or minus 10%, alongside custom width slitting to match automated wire-wrapping lines.
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Rigorous testing and inspection protocols guarantee the highest quality insulation materials.
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The FEP (Fluorinated Ethylene Propylene) layer serves as a high-temperature hot-melt adhesive. During the wire wrapping or cable manufacturing process, the film is wrapped around conductors and heated. The FEP layer melts and fuses with overlapping layers, creating a seamless, moisture-proof, and chemical-resistant insulation sleeve that prevents electrical leakage and mechanical slippage.
Our F46 polyimide film is designed for high-temperature durability. The polyimide base film can withstand extreme temperatures, while the FEP coating has a melting point of approximately 260°C. For continuous operating environments, this heat-sealable composite film provides stable electrical and mechanical insulation up to 200°C to 220°C, maintaining high dielectric breakdown strength throughout its service life.
Yes. We manufacture both single-sided and double-sided Polyimide Film With FEP Coated configurations. Single-sided FEP film is typically used for basic wire wrapping where only the outer wrap needs to fuse, while double-sided FEP film is selected for complex multi-layer wrapping, composite laminate bonding, and applications requiring an absolute, double-fused environmental seal.