Insulation materials
Polyester Film Mylar Type A
Polyester films such as Mylar A are based on polyethylene terephthalate and offer outstanding physical, chemical and electrical properties.
Mylar A from Mylar Specialty Films is the best-known PET film for electrical insulation. It remains extremely tensile and tear resistant even under heat while staying dimensionally stable.
Despite this stability, Mylar can be formed and embossed. Exactly this combination makes the film so valuable for motor manufacturing: it holds its shape in the slot yet can be folded and bent precisely in the tool. Per DIN EN 60085 Mylar A belongs to thermal class B up to 130 C.
Mylar is also resistant to solvents and oils as well as fungi and bacteria, opening up applications far beyond the electrical industry.
Use as motor insulation
With its excellent electrical insulation properties, Mylar A is ideal as motor insulation, produced as slot liners, slot wedges or phase separators. For higher thermal classes the film is laminated with fleece or aramid paper: as DMD laminate for class F or as NPN laminate with Nomex outer layers.
Other applications
Mylar is printable, metallisable and laminatable. It serves as a carrier film for adhesive tapes, is used in the printing industry and, thanks to its resistance to fungi and bacteria, in medical technology. Further fields include furniture surfaces and packaging.
Delivery formats and processing
We supply polyester film as slit rolls from a strip width of 4 mm, as sheets or as finished stamped and formed parts. On our slitting lines we convert films from 23 µm with tight tolerances and optimal winding tension. Further processing into embossed and folded insulation parts happens in-house, from our own tool shop to series production. Request thicknesses, formats and prices via our contact form.
Frequently asked questions
What thermal class does Mylar A have?
Mylar type A polyester film belongs to thermal class B per DIN EN 60085, suitable for continuous temperatures up to 130 C. For higher classes, laminates such as DMD or NPN or aramid papers are used.
What is Mylar used for in electric motors?
As slot liners, slot wedges, phase separators or cut parts. The film combines high dielectric strength with dimensional stability and can still be embossed and folded precisely.
Can Mylar be formed despite its stability?
Yes. Mylar is dimensionally stable but can be formed and embossed in the tool. This combination enables precisely fitting insulation parts that permanently keep their shape in the slot.
Which thicknesses and formats are available?
We convert polyester films from 23 µm on our own slitting lines and supply slit rolls from a strip width of 4 mm, sheets and finished stamped and formed parts to drawing.
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DMD Laminate of Fleece and Polyester Film
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NPN Laminate of Nomex and Polyester Film
NPN is a three-layer laminate of Nomex, polyester film and Nomex.
Learn more →Do you have a specific requirement?
Talk to us. We will find the right insulation solution.