Use:
It is composed of polyester film coated with high temperature resistant adhesive and polyester
fiber non-woven fabric. It has excellent mechanical, dielectric and heat resistance properties, and is suitable for groove insulation and the same insulation in F class motor.
Technical parameters:
Indicator Name（6641) | Unit | Indicator value | |||||||||||||||
Nominal thickness | mm | 0.15 | 0.18 | 0.2 | 0.23 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | |||||||
Thickness tolerance | mm | ±0.02 | ±0.025 | ±0.03 | ±0.03 | ±0.03 | ±0.03 | ±0.035 | ±0.04 | ±0.045 | |||||||
Quantitative | g/㎡ | 140±20 | 190±28 | 200±30 | 220±33 | 260±39 | 270±40 | 300±45 | 325±48 | 350±52 | 380±57 | 425±63 | 460±69 | 500±75 | 560±84 | ||
Nominal film thickness | μm | 50 | 75 | 75 | 100 | 125 | 125 | 150 | 150 | 190 | 190 | 250 | 250 | 300 | 350 | ||
Tensile strength | Vertical | Without bending | N/10mm Width | ≥80 | ≥120 | ≥130 | ≥150 | ≥180 | ≥190 | ≥180 | ≥240 | ≥270 | ≥280 | ≥320 | ≥330 | ≥350 | ≥370 |
After bending | ≥80 | ≥105 | ≥110 | ≥130 | ≥150 | ≥170 | ≥180 | ≥200 | ≥220 | ≥250 | ≥300 | ≥310 | ≥320 | ≥350 | |||
Horizontal | Without bending | ≥80 | ≥105 | ≥110 | ≥130 | ≥150 | ≥170 | ≥190 | ≥200 | ≥220 | ≥250 | ≥300 | ≥310 | ≥320 | ≥350 | ||
After bending | ≥70 | ≥90 | ≥100 | ≥110 | ≥120 | ≥150 | ≥170 | ≥150 | ≥180 | ≥220 | ≥250 | ≥280 | ≥300 | ≥250 | |||
Elongation | Vertical | Without bending | % | ≥15 | ≥5 | ≥5 | |||||||||||
After bending | ≥10 | ≥5 | ≥3 | ||||||||||||||
Horizontal | Vertical | ≥20 | ≥5 | ≥5 | |||||||||||||
Horizontal | ≥10 | ≥5 | ≥2 | ||||||||||||||
Breakdown voltage | KV | ≥6 | ≥7 | ≥8 | ≥9 | ≥10 | ≥12 | ≥13 | ≥14 | ≥15 | ≥16 | ≥18 | ≥19 | ≥21 | ≥22 | ||
Layering | - | No delamination, no bubbles or other defects | |||||||||||||||
Subject to heat (180 ± 2°C, 10 min or as agreed upon by both supplier and buyer) | - | No delamination, no bubbling, no glue dripping | |||||||||||||||
Stiffness | N | Pending | |||||||||||||||
Long-term heat resistance Temperature index (TI) | - | ≥155 | |||||||||||||||
DMD-F6641 polyester film and polyester fiber nonwoven composite insulation is engineered for high-temperature, high-load electrical environments where superior electrical insulation and mechanical performance are required. The three-layer composite construction—polyester nonwoven + polyester film + polyester nonwoven—provides a balance of strength, dielectric reliability, and thermal endurance suitable for continuous operation at 155°C. This material is commonly used in industrial motors, transformers, electric tools, generators, coils, and various electromechanical systems operating under demanding conditions.
Designed for long-term electrical insulation stability, DMD-F6641 is formulated to handle repeated thermal cycles without delamination or structural failure. The polyester film layer offers high dielectric breakdown resistance, while the polyester nonwoven contributes strong flexibility, varnish absorption, and mechanical durability. This makes DMD-F6641 ideal for applications involving vibration, moisture, and high heat.
Its enhanced corona resistance and thermal aging stability help protect motors and transformers from premature insulation failure, significantly extending equipment service life. The smooth, uniform surface supports automated manufacturing, which is critical in modern mass-production industries.
Outstanding thermal stability at 155°C
High breakdown voltage suitable for medium- and high-voltage systems
Low moisture absorption and stable performance in humid environments
Strong adhesion with epoxy and polyester varnishes
High flexural strength supporting precise forming and shaping
Suitable for slot liners, interlayer insulation, coil wrapping, and gaskets
Improved anti-aging properties under repeated thermal cycling
Dielectric Strength: 6–10 kV depending on thickness
Tensile Strength: high due to PET core
Flexibility: excellent, ideal for bending and slot insertion
Thermal Class: F (155°C)
Thickness Options: 0.15–0.40 mm
Shrinkage: minimal even after 180°C heat exposure
Industrial motors: pumps, compressors, CNC equipment
Household appliance motors: air conditioners, refrigerators, washers
Transformers: dry-type, distribution, welding, inverter transformers
Generators
Coils and windings
EV motors and high-efficiency drive systems
Magnetic coils and power electronics
Supports manual and robotic slot insertion
Compatible with VPI varnish systems
Recommended to store and use in dry conditions
Avoid over-bending extremely small radii
Clean surfaces before varnish bonding
Supplied in rolls, sheets, or die-cut parts
Store at 5–35°C with<70% humidity
Avoid pressure that may deform the rolls
Q: Can this material be used in inverter motors?
Yes, its strength and thermal stability make it suitable.
Q: What varnishes can it absorb?
Epoxy, polyurethane, and polyester systems.
Q: Is it suitable for dry-type transformers?
Yes, widely adopted.
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