Polyester film is a widely-used electrical insulating material.
Mylar is the polyester film brand of DuPont, which can be manufactured with different surfaces and different thicknesses.
Polyester films can be imprinted with a laser printer.
Polyester film is available in the thicknesses of 0.12 up to 0.5 mm. Besides we deliver laminates made of polyester film which have thicknesses from 0.8, 1.0, 1.2 and 1.5mm.
Polyester films can be cut with a laser, but traces of smoke can occur.
The polyester film is almost immune to all climate influences. We recommend storing in the shipping package until it is used. A dry, dust-free storage room with a room temperature under 30°C is favourable.
The influence of detrimental factors like moisture and direct sunlight because of long-term outside storage should be avoided. The film should be brought to the working area or a similar climatic room at least 24 hours before using.
It is recommended to remove the film out of the shipping package straight before using it. After removing the transportation with a steel spit avoids deformation or damage of the outer film layer. We are not aware of a limitation of the storability of the polyester film. Nevertheless we recommend processing the film during one year.
Polyester film is not resistant against nitric acid 65% and 100%, nitro benzine, phenol ammonium hydroxide and sodium hydroxide.
Polyester films have a cold resistance of -196°C as per DIN 53372.
PEN film was originally developed for high-class flexible printed circuits and today it is often used as an aroma barrier in PET plastic bottles. PEN (polyether naphtalat) characterises especially by a high temperature resistance against polyester (155°C service temperature, instead of 130°C).
Also Teonex® outmatches the classic polyester films (Mylar®, Hostaphan®) during ageing tests with harder conditions (dirt, moisture) because it is more resistant against hydrolysis and diffusion. Polyester films and PEN films do not differ in view of the processing.