12μm PET Polyester Film
This is the thinnest grade in this polyester film series, and also one of the strongest. At just 11.5μm, tensile strength reaches 271 MPa MD — higher than many thicker grades — so it holds up under tension without stretching out of shape. It also has a slightly unusual thermal profile: shrinkage is 1.5% MD but −0.1% TD, meaning the film expands very slightly across its width when heated. That behaviour is useful in precision electrical and electronic work where thin, stable insulation is required.
Key Specifications
| Thickness | 11.5μm (nominal 12μm) |
| Material | PET (polyethylene terephthalate) |
| Tensile strength | MD 271 MPa / TD 215 MPa |
| Elongation at break | MD 124% / TD 157% |
| Thermal shrinkage at 150°C, 30 min | MD 1.5% / TD −0.1% |
| Breakdown voltage | 4.1 kV |
| Volume resistivity at 20°C | 3E+17 Ω·cm |
| Dissipation factor at 20°C, 1 kHz | 36 |
| Coefficient of friction | μs 0.6 / μd 0.4 |
Applications
Thin 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 precision industrial insulation.
Why Choose Jinlu Film
- Thinnest gauge in this series, with high MD tensile strength
- Stable electrical performance at 4.1 kV breakdown voltage
- Custom width and roll length
- Export-grade packing and global shipping support
- Factory-direct pricing
Compare With Other Thicknesses
For even thinner film, see 0.0045 mm or 0.006 mm. For more body, see 25 μm or 38 μm. We also list a 0.012 mm PET film, our PET polyester film overview and our PET motor insulation film. Everything is in the PET film category. To learn more, read 12μm PET polyester film: the thinnest grade with the highest tensile strength, PET film vs polyester film and the PET insulation film guide.
FAQ
What does −0.1% TD shrinkage mean?
The film expands very slightly across its width when heated, instead of shrinking. This can be useful in precision electrical work where thin, stable insulation is required.
What is the breakdown voltage of 12μm PET polyester film?
4.1 kV, as listed in the specifications above.
What is the difference between PET film and polyester film?
They are the same material. Read our guide to PET film vs polyester film for the details.
Can I get samples?
Contact us with your width and application, and we will send a quote and samples.
