Flexible Composite Materials
DMD-F – 6641
Class F polyester film / polyester non-woven composite for motor slot insulation
6641 Class F DMD made of high-melting-point polyester film with hot-rolled polyester non-woven on both faces, bonded with a Class F adhesive. Used for motor slot, phase and turn insulation.
Class F (155°C)0.15–0.35 mmBreakdown ≥6–16 kV
- Temperature class
- Class F (155°C)
- Thickness
- 0.15–0.35 mm
- Width
- 5–1000 mm
- Gram weight
- 140–350 g/m²
Request a quotation or a sample. Tell us thickness, width, temperature class, quantity and delivery form. We reply within one business day.
Technical data
| Property | Unit | Value |
|---|---|---|
| Type | — | 6641 DMD |
| Structure | — | PET film + polyester non-woven on both faces |
| Normal thickness | mm | 0.15 / 0.18 / 0.20 / 0.23 / 0.25 / 0.30 / 0.35 |
| Thickness tolerance | mm | ±0.02 / ±0.03 / ±0.035 |
| Grammage | g/m² | 140±20 – 350±52 |
| Tensile strength MD | N/10 mm | ≥80–180 |
| Elongation MD / TD | % | ≥10 / ≥15 |
| Breakdown voltage, unbent | kV | ≥6–16 |
| Width | mm | 5–1000 |
| Temperature index (TI) | — | ≥155 |
| Temperature class | — | Class F (155°C) |
Values are typical values or ranges from our product data. Bulk supply is subject to the approved specification, sample and test report. If a parameter you need is not listed here, ask our engineers for the full test report for that grade.
Key features
- Three-layer flexible construction combines film dielectric strength with non-woven absorbency and abrasion resistance.
- Thickness range 0.15–0.35 mm for different motor slot insulation requirements.
- Custom slit widths and roll diameters for automatic paper inserters.
Applications
Class F motor slot insulation, wedges, phase/turn insulation; transformer layer insulation; generators and appliances.
Electric Motors & GeneratorsDry-Type TransformersSwitchgear & Electrical Equipment
Why it fits
The general-purpose Class F motor insulation - good dielectric strength, good varnish absorption, predictable thickness.
Ordering information
To receive a quotation, please confirm:
- Product and grade
- Thickness and width (and roll or sheet size)
- Temperature class
- Quantity and delivery form (roll / sheet / die-cut / machined)
- Destination port and required delivery date
For machined parts, attach a drawing in PDF, DWG or STEP format. Datasheets, COAs and batch test data are available on request.
Related materials
Often specified together
Send your specification
Our export team reviews the application, the process and the existing specification before recommending a construction.