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 material is a premium Class F (155°C) electrical insulation designed for modern industrial motors, transformers, generators, power equipment, and household appliances that require high thermal endurance, stable dielectric performance, and long-term mechanical reliability. As an upgraded version of traditional 6630 DMD, the F-class 6641 DMD uses heat-resistant polyester film combined with two layers of reinforced high-temperature polyester nonwoven, forming a robust laminated insulation structure suitable for high-performance electrical systems. This composite offers enhanced thermal resistance, superior mechanical strength, excellent varnish absorption, and improved dimensional stability under elevated temperatures, making it a preferred insulation for industrial-grade electromechanical equipment.
DMD-F6641 is produced using a thermal-lamination process that precisely bonds a central polyester film (PET) with two outer layers of heat-resistant polyester nonwoven. The polyester film acts as the dielectric layer, providing high breakdown voltage and dimensional stability, while the polyester nonwoven layers contribute flexibility, toughness, and enhanced varnish bonding. Together, the three layers create a composite insulation with balanced thermal, mechanical, and electrical performance.
The material maintains its structural integrity in high-temperature environments, resists thermal aging, and remains flexible during mechanical processing such as winding, cutting, folding, and slot insertion. Compared with B-class 6630 DMD, DMD-F6641 insulation material provides significantly better heat resistance, moisture stability, and corona resistance, ensuring long equipment lifespan even in demanding industrial conditions.
Class F (155°C) thermal endurance, meeting IEC and GB/T insulation standards
High dielectric strength, stable even after thermal aging cycles
Excellent mechanical strength and resistance to tearing and delamination
Superior varnish absorption for enhanced bonding performance
Smooth surface + flexible body, ideal for high-speed automated slot insertion
High dimensional stability with low shrinkage under heat
Corrosion-resistant, moisture-resistant, and aging-resistant
Suitable for motor slots, phase insulation, interlayer insulation, coil wrapping, and transformer insulation
| Property | Value |
Thermal Class | F (155°C) |
Breakdown Voltage | ≥ 6 kV (varies with thickness) |
Thickness | 0.15 mm – 0.40 mm |
Tensile Strength | High, based on PET core |
Density | Uniform |
Color | White / Milky |
Heat Shrinkage | Very low at 155°C |
Varnish Compatibility | Excellent with epoxy, polyester, polyurethane |
Sheet/Roll Width | 10 mm – 1000 mm customizable |
DMD-F6641 is ideal for high-temperature applications including:
Industrial motors
EV drive motors
Pumps and compressors
Household appliance motors
Fan motors and washing machine motors
Dry-type transformers
Distribution transformers
High-frequency transformers
Welding transformers
Layer insulation
Coil wrapping
Interturn insulation
Phase insulation
Generators
Magnetic coils
Welding machines
UPS power systems
Can be slit, punched, die-cut, folded, and formed
Keep edges smooth to maintain dielectric strength
Works best after varnish impregnation & curing
Compatible with high-speed automated insertion systems
Avoid excessive wrinkling during mechanical pressure
Ensure surfaces are dry before use
Store in dry, ventilated room at 5–35°C
Avoid direct sunlight and moisture
Keep rolls sealed before use
Packaging includes rolls, sheets, cartons, and pallets
Shelf life: 12–24 months when stored properly
Q1: What makes DMD-F6641 different from regular 6630 DMD?
F-class 6641 offers higher temperature resistance (155°C vs 130°C), better mechanical strength, and longer lifespan.
Q2: Can DMD-F6641 be used for high-speed slot insertion?
Yes. The laminated structure is flexible and durable, suitable for automated production.
Q3: Does varnish impregnation improve performance?
Yes. It greatly enhances bonding, moisture resistance, and electrical strength.
Q4: What transformer types commonly use 6641 DMD?
Dry-type, distribution, welding, and low-voltage transformers.
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