Polyester Film for Electrical Insulation

Polyester Film for Electrical Insulation is a thin film that can ensure good electrical insulation.

This film should have high resistivity (above 10Ω·cm) and breakdown field strength. In order to be used for high-frequency insulation, the material is also required to have a low dielectric loss

Polyester film 6020 & 6021 is a biaxial oriented polythylene terephthalate(PET) film through melting, casting and stretching.

6020-Polyester Film For Electrical Insulation is a transparent PET film

6021-Polyester Film For Electrical Insulation is a milky white PET film.

They are flat, low shrinkage, excellent insulation properties, UL approved

It is Class E insulating material.

This product has good dielectric and high mechanical properties.

Thermal class: E(120ºC) 

This product has good dielectric and high mechanical properties. It is widely used for electrical insulation. Such as slot insulation, liner insulation in electric motors, and producing insulating flexible laminates.

6020 Transparent PET Electrical Insulating Polyester Film and 6021 Milky White mylar polyester film

  • • Excellent electrical insulation.
  • • Thermal stability at elevated temperatures
  • •Insulate class: E

Polyester Film for Electrical Insulation Technical parameter

PropertiesUnit     NO.1#2#3#4#5#6#7#8#Test method 
Tensile StrengthMDMpa200200182185175170172180GB12802.2 
Elongation at breakMD%115125115120150130150148GB12802.2 
Breakdown voltageV/μm22018816514512612310492GB12802.2 
Volume resistivityΩ.m1.0×10141.0×10141.0×10141.0×10141.0×10141.0×10141.0×10141.0×1014GB12802.2 
Ralative dielectric constant(48Hz-62Hz) 
Dielectric loss tangent(48Hz-62Hz) 2.8×10-32.8×10-32.8×10-32.8×10-32.8×10-32.8×10-32.8×10-32.8×10-3GB12802.2 
Light Transmittance%6660523935312926GB2410 
Flame retardancy VTM-2VTM-2VTM-2VTM-2VTM-2VTM-2VTM-2VTM-2ANSI/UL94


If you have any request for Polyester Film for Electrical Insulation, kindly contact us. You can email us or leave a message online.


Q1: How about MOQ?

MOQ is according to different products. Whatever you need, we are glad to quote the best price with good quality

Q2: Can you send samples for testing?

500g Samples are free supplied, but express freight should be taken by the client. After making an order, we’d like to return freight back.

Q3: How can you guarantee the quality of mass goods is the same as the sample sent to me before?

We kept another same sample and marked it on the company when we sent it to a customer. So our products will be based on.

Q4: Which package do you use?

The package is an important part to avoid goods breaking in transportation. We will choose suitable packing depending on the materials.

Q5: When customer respond quality issues after pick up goods, how to deal with?

1) Customer could supply photos of issued goods for our sales staff and then we’ll verify which part is wrong. 
2) If the issue is confirmed, the company will negotiate with customers and compensate incoming orders.