Polyester film and polyester fiber nonwoven composite material (6630DMD) is a widely used Class B (130°C) electrical insulation laminate designed for motors, transformers, coils, and industrial electrical equipment that require stable mechanical strength and dependable dielectric performance. This DMD composite consists of high-quality polyester nonwoven on both sides and a strong polyester film core in the middle, forming a soft yet durable multilayer insulation material with excellent flexibility, smooth surface, and uniform thickness. The polyester film provides superior dielectric strength and dimensional stability, while the polyester nonwoven layer enhances tear resistance, mechanical toughness, and varnish absorption, making the material ideal for vacuum pressure impregnation and long-term electrical insulation applications. With its combination of toughness and insulation reliability, 6630DMD polyester composite insulation is widely used for motor slot liners, interlayer insulation, coil wrapping, phase insulation, transformer layer insulation, and various electrical component barriers. It also demonstrates strong mechanical performance during high-speed slot insertion and coil assembly, ensuring that the insulation layer stays intact without cracking or delamination. The nonwoven surface improves bonding strength with resins and varnishes, providing enhanced stability and extending the service life of electrical machinery under continuous thermal stress. As a cost-effective and versatile insulation material, polyester film and polyester fiber nonwoven DMD laminate supports excellent heat resistance, smooth processing, and easy die-cutting, making it suitable for automated production lines and precision insulation manufacturing. Its resistance to moisture, breakdown voltage, and mechanical fatigue ensures consistent performance in household appliances, industrial motors, EV auxiliary motors, welding equipment, power tools, pumps, and generators. With growing demand for reliable mid-temperature electrical insulation, 6630DMD laminated polyester insulation remains one of the most preferred solutions for manufacturers seeking durability, stable electrical performance, and economical insulation options. Whether used as slot insulation, interturn insulation, gaskets, or protective layers in transformers and coils, 6630DMD delivers dependable dielectric strength and mechanical reinforcement, helping ensure efficient, long-lasting operation of electrical devices in a wide range of industrial and commercial environments.