38μm PET Polyester Film
On a winding line, 38μm is often the point where operators stop worrying about the film. It is thick enough to hold tension without snapping, thin enough to sit neatly inside compact coil and transformer designs, and its 10.4 kV breakdown voltage gives engineers a comfortable safety margin for Class B insulation work. Elongation at break sits at 180% MD and 161% TD, so the film takes the bends and folds of automated assembly without cracking at the edges.
Key Specifications
| Thickness | 38μm |
| Material | PET (polyethylene terephthalate) |
| Tensile strength | MD 217 MPa / TD 238 MPa |
| Elongation at break | MD 180% / TD 161% |
| Thermal shrinkage at 150°C, 30 min | MD 1.2% / TD 0.2% |
| Breakdown voltage | 10.4 kV |
| Volume resistivity at 20°C | 2E+17 Ω·cm |
| Dissipation factor at 20°C, 1 kHz | 40 |
| Coefficient of friction | μs 0.6 / μd 0.4 |
Applications
Interlayer insulation in transformers and chokes, wire and cable wrapping, flexible printed circuits (FPC), membrane switches, die-cut insulation parts, adhesive tape backing, and spiral tube winding.
Target industries: electrical and electronic manufacturing, coil and transformer winding, flexible circuitry, and industrial insulation.
Why Choose Jinlu Film
- 10.4 kV breakdown voltage with a comfortable safety margin
- Good elongation for automated winding and folding
- Custom width and roll length
- Export-grade packing and global shipping support
- Factory-direct pricing
Compare With Other Thicknesses
For a thinner film, see 25 μm. For more voltage and body, see 50 μm or 75 μm. We also list a 0.038 mm PET film, a 38μm BOPET film and our PET polyester film overview. Everything is in the PET film category. To learn more, read 38μm PET polyester film: how to compare suppliers before you order and the PET insulation film guide.
FAQ
What is the breakdown voltage of 38μm PET polyester film?
10.4 kV, as listed in the specifications above.
Why do operators like 38μm on a winding line?
It is thick enough to hold tension without snapping, and thin enough to sit neatly inside compact coil and transformer designs.
What is Class B insulation?
It is a standard insulation temperature class, typically rated for 130°C. This film is used for Class B insulation work.
Can I get samples?
Contact us with your width and application, and we will send a quote and samples.
