25μm PET Polyester Film
Step up from the ultra-thin grades and you get a film that is easier to handle and harder to break down electrically. At 25μm, this PET polyester film delivers a 7.5 kV breakdown voltage — nearly double the 12μm grade — while keeping 215 MPa MD tensile strength and good dimensional stability. It handles winding, slitting, and die-cutting without the fragility you sometimes get with very thin films.
Key Specifications
| Thickness | 25μm |
| Material | PET (polyethylene terephthalate) |
| Tensile strength | MD 215 MPa / TD 238 MPa |
| Elongation at break | MD 170% / TD 165% |
| Thermal shrinkage at 150°C, 30 min | MD 1.2% / TD 0.1% |
| Breakdown voltage | 7.5 kV |
| Volume resistivity at 20°C | 2E+17 Ω·cm |
| Dissipation factor at 20°C, 1 kHz | 39 |
| Coefficient of friction | μs 0.6 / μd 0.4 |
Applications
Electrical insulation, flyback transformers (FBT), choke coils, wire insulation and cable tape, flexible printed circuits (FPC), membrane switches, die-cut electrical insulation, mold release, adhesive tape, and spiral tube converting.
Target industries: electrical and electronic manufacturing, transformer and coil winding, flexible circuitry, and industrial insulation.
Why Choose Jinlu Film
- 7.5 kV breakdown voltage with stable electrical performance
- Easier handling than ultra-thin grades
- Custom width and roll length
- Export-grade packing and global shipping support
- Factory-direct pricing
Compare With Other Thicknesses
For a thinner film, see 12 μm. For more voltage and body, see 38 μm or 50 μm. We also list a 0.025 mm PET film, a 25μm BOPET film and our PET polyester film overview. Everything is in the PET film category. To learn more, read 25μm PET polyester film: thin insulation with a 7.5 kV breakdown voltage and the PET insulation film guide.
FAQ
What is the breakdown voltage of 25μm PET polyester film?
7.5 kV, as listed in the specifications above.
Why choose 25μm over thinner grades?
It is easier to handle and harder to break down electrically, and it runs through winding, slitting and die-cutting without the fragility of very thin films.
What is it used for?
Electrical insulation for transformers, choke coils, wire and cable tape, plus flexible printed circuits, membrane switches and die-cut insulation.
Can I get samples?
Contact us with your width and application, and we will send a quote and samples.
