Flexible Composite Materials
Prepreg DMD
B-stage epoxy prepreg DMD, Class F, for cast-resin dry-type transformers
PET film laminated to two layers of polyester non-woven and impregnated with a B-stage epoxy resin. The resin reflows and bonds during impregnation and curing to form an integrated, solid layer insulation.
Class F (155°C)0.15–0.40 mmResin content ≥30%
- Temperature class
- Class F (155°C)
- Thickness
- 0.15–0.40 mm
- Width
- 5–1300 mm
- Resin content
- ≥30%
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 |
|---|---|---|
| Structure | — | PET film + two PET non-woven layers + B-stage epoxy |
| Normal thickness | mm | 0.15 / 0.18 / 0.20 / 0.25 / 0.30 / 0.40 |
| Thickness tolerance | mm | ±0.02 / ±0.03 / ±0.04 |
| Width | mm | 5–1300 |
| Core ID | mm | 76 |
| Tensile strength | 10 N/mm | ≥70 / ≥80 / ≥100 |
| Soluble resin content | g/m² | ≥45 |
| Volatiles | % | ≤1.5 |
| Tensile shear strength | MPa | ≥3.0 |
| Breakdown voltage | kV | ≥7 / ≥8 / ≥10 |
| Oil resistance (150°C / 24 h) | — | Surface smooth, no blister, no corrugation |
| Resin content | % | ≥30 |
| 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
- B-stage resin reflows during impregnation and curing to form an integrated bond.
- Film / non-woven construction balances dielectric strength and resin penetration.
- Designed for layer insulation in cast-resin dry-type transformer coils.
Applications
Layer insulation in cast-resin dry-type transformers and distribution transformer coils.
Dry-Type TransformersDistribution Transformers
Why it fits
Turns layer insulation into part of the cured structure - the coil becomes one solid block instead of stacked sheets.
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.