Transformer Insulation Materials
Diamond Dotted AMA
Cable paper / polyester film laminate with diamond-pattern adhesive, Class B
A cable paper / PET film laminate with a diamond-pattern adhesive that cures into a stable bond after 140°C heat treatment. Designed for HV-LV interlayer insulation in oil-immersed transformers.
Class B (130°C)Thickness 0.15 / 0.20 mmAdhesive strength 820 kPa
- Temperature class
- Class B (130°C)
- Thickness
- 0.15 mm / 0.20 mm
- Breakdown voltage
- 8.1–12.5 kV
- Curing
- 140°C / 3–4 h
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 |
|---|---|---|
| Thickness | mm | 0.15 / 0.20 |
| Adhesive strength, normal | kPa | 820 |
| Breakdown voltage, normal oil (ø25 mm / ø75 mm electrode, rapid boost) | kV | 8.1–12.5 |
| Breakdown voltage after bending | kV | 11.65–13.33 |
| Power-frequency withstand (120°C ±2°C, 15 min) | — | 6 kV and 8 kV passed |
| Dielectric constant | — | 2.42 |
| Dielectric loss factor (120°C ±2°C) | — | 2.58×10⁻³ / 3.19×10⁻³ |
| Pollution of transformer oil | — | <0.001 (8.0×10⁻³) |
| Fixed quantity | g/m² | 180±5% / 230±5% |
| Curing conditions | — | 140°C, 3–4 h |
| Temperature class | — | Class B (130°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
- Combines the oil affinity of cable paper with the dielectric strength of PET film.
- Double-sided adhesive layers cure into a stable bond for continuous lamination and winding.
- Reduces process steps and improves productivity compared with conventional cable-paper bonding.
Applications
HV/LV interlayer insulation in oil-immersed power transformers and distribution transformers.
Oil-Immersed TransformersDistribution Transformers
Why it fits
Where cable paper alone is not enough, the PET core raises dielectric strength at a wall thickness the winding design already uses.
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.