Use:
Temperature resistance: Class b, the product has excellent electrical insulation, heat resistance and mechanical strength, as well as excellent impregnation, suitable for y series motors, electrical appliances as slot insulation, phase to phase, turn to turn and liner insulation.
Technical parameters:
Indicator Name（6630) | 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 | ±0.065 | ±0.04 | ±0.045 | ||
Quantitative | g/㎡ | 140±20 | 190±28 | 220±33 | 260±39 | 300±45 | 350±52 | 425±63 | 500±75 | 560±84 | ||
Nominal film thickness | μm | 50 | 75 | 100 | 125 | 150 | 190 | 250 | 300 | 350 | ||
Tensile strength | Vertical | No bending | N/10mm Width | ≥80 | ≥120 | ≥140 | ≥180 | ≥200 | ≥270 | ≥320 | ≥340 | ≥370 |
After bending | ≥80 | ≥105 | ≥120 | ≥150 | ≥170 | ≥200 | ≥300 | ≥320 | ≥350 | |||
Horizontal | No bending | ≥80 | ≥105 | ≥120 | ≥150 | ≥170 | ≥200 | ≥300 | ≥320 | ≥350 | ||
After bending | ≥70 | ≥90 | ≥100 | ≥120 | ≥130 | ≥150 | ≥200 | ≥220 | ≥250 | |||
Elongation | Vertical | Vertical | % | ≥15 | ≥5 | ≥5 | ||||||
Horizontal | ≥10 | ≥5 | ≥3 | |||||||||
Horizontal | No bending | ≥20 | ≥5 | ≥5 | ||||||||
After bending | ≥10 | ≥5 | ≥2 | |||||||||
Breakdown voltage | kV | ≥6 | ≥7 | ≥9 | ≥10 | ≥12 | ≥15 | ≥18 | ≥20 | ≥22 | ||
Layering | -- | No delamination, no bubbles or other defects | ||||||||||
Subject to heat (155 ± 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) | -- | ≥130 | ||||||||||
Indicator Name（6630A) | Unit | Indicator value | |||||||||
Nominal thickness | mm | 0.18 | 0.2 | 0.23 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | ||
Thickness tolerance | mm | ±0.025 | ±0.03 | ±0.03 | ±0.03 | ±0.03 | ±0.035 | ±0.04 | ±0.045 | ||
Quantitative | g/㎡ | 170±25 | 200±30 | 220±33 | 250±37 | 300±45 | 340±50 | 400±57 | 470±66 | ||
Nominal film thickness | μm | 50 | 75 | 75 | 100 | 125 | 150 | 190 | 250 | ||
Tensile strength | Vertical | No bending | N/10mm Width | ≥100 | ≥120 | ≥130 | ≥150 | ≥170 | ≥200 | ≥300 | ≥340 |
After bending | ≥90 | ≥105 | ≥115 | ≥130 | ≥150 | ≥180 | ≥220 | ≥300 | |||
Horizontal | No bending | ≥90 | ≥105 | ≥115 | ≥130 | ≥150 | ≥180 | ≥220 | ≥300 | ||
After bending | ≥70 | ≥95 | ≥100 | ≥120 | ≥130 | ≥160 | ≥200 | ≥220 | |||
Elongation | Vertical | Vertical | % | ≥10 | ≥5 | ≥5 | |||||
Horizontal | ≥10 | ≥5 | ≥3 | ||||||||
Horizontal | No bending | ≥15 | ≥5 | ≥5 | |||||||
After bending | ≥15 | ≥5 | ≥2 | ||||||||
Breakdown voltage | kV | ≥7 | ≥8 | ≥8 | ≥10 | ≥11 | ≥13 | ≥16 | ≥19 | ||
Layering | -- | No delamination, no bubbles or other defects | |||||||||
Subject to heat (155 ± 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) | -- | ≥130 | |||||||||
Polyester film and polyester fiber nonwoven composite material (6630DMD) is an essential Class B insulation product widely used in the electrical manufacturing industry for its excellent balance of mechanical strength, electrical reliability, and cost efficiency. This three-layer composite—consisting of polyester nonwoven fabric on both sides paired with a polyester PET film core—offers superior flexibility, high tensile strength, stable dielectric performance, and excellent bonding with insulating varnish. Designed for motors, transformers, coils, industrial power equipment, appliances, and power tools, 6630DMD composite insulation remains one of the most frequently used insulating laminates in the global market.
6630DMD is produced through advanced thermal-lamination processes that ensure uniform adhesion between layers while maintaining a smooth finish and stable thickness. The polyester nonwoven layers provide softness and mechanical protection, making the material resistant to cracking and delamination even when subjected to folding or slot insertion. The middle polyester film layer delivers high breakdown voltage and dimensional stability. Together, these layers create a material suitable for medium-load electrical systems operating at temperatures up to 130°C.
As industries continue to pursue reliability and production efficiency, DMD insulation plays a key role in electrical manufacturing due to its adaptability, ease of processing, and compatibility with modern varnish impregnation technologies.
High dielectric strength supports safe operation in motors and transformers
Good tensile and tear resistance due to reinforced nonwoven layers
Uniform structure prevents weak points and ensures consistent insulation
Excellent impregnation and bonding ability with epoxy/polyester varnishes
Smooth, flexible surface supports cold forming and automated processes
Cost-effective solution for mass-production electrical equipment
Stable behavior under thermal cycling extending equipment service life
Insulation class: Class B 130°C
Breakdown voltage: 4–8 kV depending on thickness
Thickness: 0.15–0.35 mm
Width: 10–1000 mm
Density: stable across multilayer design
Flame resistance: inherent polyester material characteristics
Chemical resistance: resistant to common insulating varnishes, oils, and solvents
6630DMD is widely applied in:
Electric Motors: slot liners, top wedges, phase insulation
Transformers: layer insulation, barrier sheets, protective wraps
Coils: wrapping insulation, spacers, separators
Industrial Machines: compressors, pumps, welding machines
Household Appliances: AC motors, refrigerator motors, fan motors
Power Tools: drill motors, grinder motors, saw motors
Generators and alternators
Its versatility and performance make it suitable for both traditional and modern high-efficiency electrical systems.
Can be cut, punched, shaped, die-cut, or slit
Keep edges clean to prevent insulation breakdown
For slot insulation, avoid excessive friction during insertion
Apply with epoxy or polyester varnish for best bonding
Suitable for VPI (Vacuum Pressure Impregnation)
Delivered in rolls, sheets, pads, or custom die-cut pieces
Store in cool, dry, ventilated environment
Avoid direct sunlight and high humidity
Recommended storage temperature: 5–35°C
Shelf life: 12 months under ideal conditions
IEC 60243 (Electrical Strength)
IEC 60216 (Thermal Endurance)
IEC 60455 (Insulating Materials)
GB/T 5591.3 Chinese insulation standards
Q1: Can 6630DMD be used in high-speed automated production lines?
Yes, its flexibility and tear resistance make it ideal for automated slot insertion and die-cutting.
Q2: Is 6630DMD suitable for transformers used in industrial environments?
Yes, DMD is widely used in distribution transformers, welding transformers, and low-voltage power equipment.
Q3: Does varnish impregnation improve performance?
Yes, varnish significantly enhances bonding strength, moisture resistance, and dielectric properties.
Q4: What is the difference between 6630 and 6641 DMD?
6630 is Class B (130°C), while 6641 is Class F (155°C) with higher heat resistance.
Q5: Can DMD replace aramid or polyimide materials?
No, those materials serve higher temperature classes and different performance levels.
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