Use:
Class H motor slot insulation, turn to turn, interlayer and pad insulation, as well as high temperature resistant electrical and electronic equipment insulation.
Technical parameters:
Indicator Name（6650) | Unit | Indicator value | ||||||||
Nominal thickness | mm | 0.16 | 0.19 | 0.21 | 0.24 | 0.26 | 0.3 | 0.36 | ||
Thickness tolerance | mm | ±0.02 | ±0.03 | ±0.04 | ±0.05 | |||||
Quantitative | g/㎡ | 175±25 | 195±30 | 230±35 | 260±40 | 300±45 | 330±45 | 410±50 | ||
Nominal thickness of polyimide film | μm | 50 | 75 | 100 | 125 | 150 | 190 | 250 | ||
Nominal thickness of polyimide fiber paper | μm | 50 | 50 | 50 | 50 | 50 | 50 | 50 | ||
Tensile strength | Vertical | No bending | N/10mm Width | ≥120 | ≥140 | ≥160 | ≥180 | ≥200 | ≥250 | ≥270 |
After bending | ≥70 | ≥90 | ≥90 | ≥130 | ≥150 | ≥170 | ≥180 | |||
Horizontal | No bending | ≥80 | ≥90 | ≥100 | ≥110 | ≥120 | ≥150 | ≥170 | ||
After bending | ≥50 | ≥70 | ≥80 | ≥80 | ≥100 | ≥110 | ≥130 | |||
Elongation | Vertical | % | ≥10 | |||||||
Horizontal | ≥8 | |||||||||
Breakdown voltage | No bending | kv | ≥8 | ≥9 | ≥10 | |||||
After bending | ≥7 | ≥8 | ≥9 | |||||||
Layering | -- | No delamination, no bubbles or other defects | ||||||||
Subject to heat (200 ± 2°C, 10 min or as agreed upon by the supplier and buyer) | -- | No delamination, no bubbling, no glue dripping | ||||||||
Stiffness | N | Pending | ||||||||
Long-term heat resistance Temperature index (TI) | -- | ≥180 | ||||||||
Indicator Name（6650A) | Unit | Indicator value | ||||||||
Nominal thickness | mm | 0.15 | 0.19 | 0.21 | 0.23 | 0.26 | 0.3 | 0.31 | ||
Thickness tolerance | mm | ±0.02 | ±0.03 | ±0.04 | ±0.05 | |||||
Quantitative | g/㎡ | 155±25 | 175±25 | 195±30 | 230±35 | 260±40 | 300±45 | 330±50 | ||
Nominal thickness of polyimide film | μm | 50 | 75 | 100 | 125 | 150 | 190 | 250 | ||
Nominal thickness of polyimide fiber paper | μm | 50 | 50 | 50 | 50 | 50 | 50 | 50 | ||
Tensile strength | Vertical | No bending | N/10mm Width | ≥120 | ≥140 | ≥160 | ≥180 | ≥200 | ≥250 | ≥270 |
After bending | ≥70 | ≥90 | ≥110 | ≥130 | ≥150 | ≥170 | ≥180 | |||
Horizontal | No bending | ≥100 | ≥120 | ≥140 | ≥150 | ≥170 | ≥200 | ≥220 | ||
After bending | ≥70 | ≥90 | ≥110 | ≥120 | ≥140 | ≥160 | ≥170 | |||
Elongation | Vertical | % | ≥10 | |||||||
Horizontal | ≥8 | |||||||||
Breakdown voltage | No bending | kv | ≥8 | ≥9 | ≥10 | |||||
After bending | ≥7 | ≥8 | ≥9 | |||||||
Layering | -- | No delamination, no bubbles or other defects | ||||||||
Subject to heat (200 ± 2°C, 10 min or as agreed upon by the supplier and buyer) | -- | No delamination, no bubbling, no glue dripping | ||||||||
Stiffness | N | Pending | ||||||||
Long-term heat resistance Temperature index (TI) | -- | ≥180 | ||||||||
Polyimide film polyaramid fiber paper composite material (6650NHN) is one of the most widely used high-temperature electrical insulation laminates in the global motor, transformer, and industrial power equipment markets. Combining polyimide film with two layers of polyaramid fiber paper, the NHN composite provides excellent thermal endurance, mechanical strength, dielectric reliability, and long-term stability in demanding electrical environments. Classified as Class H (180°C) insulation, 6650NHN is specifically engineered for modern high-efficiency electrical machines requiring stable long-term insulation under high thermal stress, high frequency, strong vibration, and extended operation cycles. Because of its unique multilayer structure, outstanding varnish absorption, tear resistance, and superior breakdown voltage, NHN insulation is widely selected as a preferred slot liner, phase insulation, gasket material, and interlayer insulation in various electrical engineering applications.
6650NHN is a three-layer insulation composite consisting of:
Outer layer: Polyaramid fiber paper
Middle layer: High-temperature polyimide film
Inner layer: Polyaramid fiber paper
This combination provides the mechanical toughness of aramid paper and the superior dielectric strength of polyimide film. The result is a highly stable composite insulation material that maintains excellent electrical performance even under extreme conditions such as high temperatures, high voltages, high mechanical stress, and frequent thermal cycling.
Unlike standard insulating laminates such as DMD or NMN, 6650NHN is designed for continuous high-temperature operation, making it suitable for advanced applications including servo motors, traction motors, industrial variable-frequency motors, aerospace devices, and high-voltage electrical components.
Class H (180°C) thermal rating
High breakdown voltage
Excellent dielectric strength
Outstanding heat-resistance and thermal aging performance
Excellent mechanical toughness and tear resistance
Smooth surface and uniform thickness
High flexibility and easy processing
Great compatibility with varnish and epoxy resins
Stable chemical resistance and moisture resistance
No delamination under long-term stress
Excellent corona resistance
These advantages make 6650NHN a highly reliable insulation material in demanding electrical environments.
| Property | Typical Value |
Thermal Class | Class H 180°C |
Thickness Range | 0.15mm – 0.40mm |
Breakdown Voltage | ≥12 kV (depending on thickness) |
Tensile Strength | ≥70 N/10 mm |
Temperature Resistance | Long-term 180°C; short-term up to 220°C |
Density | 1.2–1.4 g/cm³ |
Dielectric Loss | Very low |
Moisture Absorption | <3% |
Resin Compatibility | Excellent with VPI, vacuum impregnation, and epoxy |
Actual parameters may vary depending on thickness, manufacturer settings, and customer requirements.
Slot liners
Slot wedges
Phase insulation
Coil wrapping
Layer insulation
NHN is widely used in H-class motors, servo motors, traction motors, automotive motors, and EV components.
Interlayer insulation
Winding insulation
Core insulation
Gaskets and spacers
NHN helps maintain long-term stability in high-temperature dry-type transformers.
High-temperature relays
Sensors
Electronic modules
Solenoids
Welding machines
High-temperature wiring
Electrical assemblies in aircraft
Specialized high-voltage insulation
Wind turbine generators
EV motors and charging systems
High-voltage battery insulation
6650NHN is easy to:
Punch
Die-cut
Fold
Wrap
Laminate
Its flexibility allows accurate forming without cracking or delamination.
Excellent penetration
Stable bonding after curing
No softening under heat
Compatible with polyurethane, polyester, epoxy, and VPI systems.
Keep material clean and dry
Avoid excessive bending at low temperature
Store in sealed packaging
Avoid contact with acids or alkaline solutions
6650NHN typically meets:
IEC 60674
GB/T 5591
UL standards (for specific models)
RoHS and REACH environmental requirements
Up to 180°C continuous, short-term peaks up to 220°C.
Yes, its aramid fiber paper has excellent varnish absorption.
No, its laminated structure ensures long-term dimensional stability.
Yes, NHN is widely used in EV traction motors and high-temperature modules.
Slot insulation: 0.20–0.30 mm
Interlayer: 0.13–0.20 mm
Gaskets/spacers: 0.25–0.40 mm
Standard rolls: 50–100 m
Customized widths available
Store at 10–35°C
Avoid humidity above 70%
Shelf life: 12–24 months under correct storage
Polyimide film polyaramid fiber paper composite material (6650NHN) is a high-performance insulation solution designed for challenging electrical applications requiring superior heat resistance, dielectric strength, and long-term reliability. Its combination of polyimide film and aramid fiber paper makes it one of the most durable, stable, and trusted insulation materials for modern motors, transformers, and industrial electrical systems.
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