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 a widely used electrical insulation laminate designed for motors, transformers, coils, industrial power equipment, household appliances, and various electromechanical systems that require stable dielectric performance and reliable mechanical strength. As a Class B (130°C) insulation material, 6630DMD combines a middle layer of high-strength polyester film with two outer layers of polyester fiber nonwoven, forming a flexible, durable, and cost-effective composite that delivers a balance of electrical, thermal, and mechanical properties. The composite structure provides excellent breakdown voltage, smooth processing performance, strong tensile strength, uniform thickness, and good bonding ability with insulating varnishes. Because of these advantages, 6630DMD polyester film nonwoven composite insulation has become the preferred choice in a wide range of low- to medium-temperature electrical applications.
The 6630DMD laminate is manufactured through a multi-layer thermal lamination process using high-purity polyester film (PET) and premium polyester nonwoven fabric. The middle PET film acts as the main dielectric layer, offering high breakdown voltage and dimensional stability, while the outer nonwoven layers provide mechanical reinforcement, tear resistance, flexibility, and improved varnish absorption. This design allows DMD insulation material to withstand mechanical stress during slot insertion, coil winding, or transformer assembly without cracking or delaminating. The material’s surface is smooth yet resilient, enabling easy punching, folding, slitting, and forming. Due to its stable electrical performance and low production cost, 6630DMD is widely adopted in electric motor factories, transformer manufacturers, appliance producers, and industrial equipment suppliers.
Class B thermal rating: 130°C continuous operation
High dielectric strength from polyester film core
Excellent mechanical strength and resistance to tearing
Good varnish absorption and bonding characteristics
Stable performance under humidity and moderate heat
Suitable for automated high-speed slot insertion
Uniform thickness, smooth surface, and good flexibility
Available in rolls, sheets, die-cut parts, and custom specifications
Thermal class: B (130°C)
Breakdown voltage: typically 4–8 kV depending on thickness
Tensile strength: high due to laminated PET core
Thickness range: 0.15mm / 0.18mm / 0.20mm / 0.25mm / 0.30mm
Density: uniform and stable across multilayer structure
Bonding strength: strong after impregnation
Color: white or milky white
Width options: 10mm–1000mm (customizable)
Heat resistance: maintains structure under thermal aging cycles
6630DMD is widely used in:
Small, medium, and large electric motors
Transformers (dry-type, oil-immersed, distribution transformers)
Motor slot insulation, top sticks, wedge liners
Coil wrapping insulation for stators and rotors
Layer insulation between transformer windings
Phase insulation and interturn insulation
Welding machine insulation parts
Household appliance motors (fan motors, blender motors, pump motors)
Industrial machinery and power tools
Its combination of thermal resistance, electrical strength, and cost efficiency makes 6630DMD ideal for mass-production industries.
Cut to required sizes using slitting or die-cutting equipment
When used for slot liners, ensure smooth insertion to avoid tearing
Compatible with varnish systems such as polyester, epoxy, and polyurethane
Best performance achieved after varnish impregnation and curing
Avoid excessive folding to maintain dielectric strength
Ensure surfaces are clean and dry before use
Store in dry, clean, ventilated environment
Keep away from sunlight, moisture, and high heat
Recommended storage temperature: 5–35°C
Packaging options: rolls, sheets, cartons, pallets
Shelf life: typically 12 months under proper storage conditions
6630DMD materials generally comply with:
IEC 60243 electrical strength standards
IEC 60216 thermal evaluation
IEC 60641 for insulating materials
GB/T 5591.3 Chinese insulation laminate standard
Q1: What is the thermal rating of 6630DMD?
A: Class B, 130°C continuous.
Q2: How does 6630DMD differ from 6641 F-class DMD?
A: 6641 uses higher-temperature materials and withstands 155°C; 6630 is cost-effective for general motors.
Q3: Does DMD need varnish impregnation?
A: Impregnation improves bonding and breakdown voltage; recommended for motors and transformers.
Q4: Can DMD be used in high-humidity environments?
A: Yes, but proper varnish curing is required for long-term stability.
Q5: Does it support automated production?
A: Yes, widely used for automated slot insertion and coil wrapping lines.
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