Polyester film and polyester fiber nonwoven composite material (DMD-F6641) is a high-quality Class F (155°C) electrical insulation laminate designed for motors, transformers, coils, generators, and various electrical devices requiring stable thermal endurance and reliable dielectric performance. This advanced composite is produced by laminating a strong polyester film between two layers of premium polyester fiber nonwoven, forming a multilayer insulation structure with excellent flexibility, uniform thickness, and high mechanical resilience. The upgraded formulation of DMD-F6641 polyester composite insulation provides enhanced heat resistance, improved breakdown voltage, and superior dimensional stability compared to standard DMD materials, making it ideal for medium- and high-voltage electrical applications. The polyester film layer contributes strong dielectric strength and stability under continuous thermal load, while the polyester nonwoven enhances tear resistance, mechanical toughness, and varnish absorption, ensuring firm bonding and long-term durability after vacuum pressure impregnation. This combination allows DMD-F6641 laminated polyester insulation to maintain stable electrical performance during slot insertion, coil wrapping, transformer layering, and high-speed automated winding operations. Its smooth surface and flexible structure make it easy to cut, punch, fold, and shape, supporting precise manufacturing processes and automated production lines. Widely used in industrial motors, household appliances, EV drive systems, welding machines, pumps, generators, and transformers, DMD-F6641 polyester nonwoven laminate delivers dependable mechanical strength and thermal resistance even under harsh and humid environments. The material’s resistance to corona, mechanical fatigue, and thermal aging ensures long service life, helping electrical equipment maintain energy efficiency and performance stability. As industries increasingly demand insulation materials that combine cost-effectiveness with high reliability, DMD-F6641 polyester film composite insulation has become a preferred solution for manufacturers seeking durable, stable, and high-temperature insulation for modern electrical machinery. Whether applied as slot insulation, interlayer insulation, coil wrapping, gasket materials, phase insulation, or barrier components, DMD-F6641 offers consistent dielectric strength, strong bonding characteristics, and reliable mechanical protection. With its balanced performance and high compatibility with insulating varnishes and bonding resins, this composite material stands out as an essential choice for ensuring safe, long-lasting, and efficient operation of electrical devices across industrial and commercial sectors.