Transformer Insulation Materials
PET Composite Cowl
Multi-layer polyester film composite board, Class F
Polyester film composite board built from layers of PET film coated with high-temperature adhesive, for HV-LV inter-coil and end insulation in dry-type transformers.
Class F (155°C)SBFWB-0.5 / SBFWB-1.1Machine-direction ≥350 N/10 mm
- Temperature class
- Class F (155°C)
- Thickness
- 0.5 / 1.1 mm
- Standard width
- 1000 mm
- PET layers
- 2 / 4
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 | — | SBFWB-0.5 / SBFWB-1.1 |
| Normal thickness | mm | 0.5 / 1.1 |
| Thickness tolerance | mm | ±0.045 / ±0.09 |
| Grammage | g/m² | 622 ±68 / 1120 ±112 |
| PET film thickness | µm | 250 |
| PET layers | layers | 2 / 4 |
| Tensile strength MD / TD | N/10 mm | ≥350 / ≥600 |
| Elongation MD / TD | % | ≥30 / ≥30 (0.5 mm); ≥50 / ≥50 (1.1 mm) |
| Breakdown voltage, unbent | kV | ≥35 / ≥50 |
| Breakdown voltage, after bending | kV | ≥30 / ≥40 |
| 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
- Multi-layer PET construction allows thickness and dielectric strength to be designed in.
- A lighter alternative to some epoxy or phenolic boards for inter-coil and end insulation.
- Standard width 1000 mm; slitting and custom widths available.
Applications
HV-LV inter-coil insulation, insulation cylinders and end insulation in dry-type transformers; reactors.
Dry-Type TransformersReactorsElectric Motors & Generators
Why it fits
For dry-type transformers the composite gives you dielectric strength without the mass and machining cost of a rigid laminate.
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.