Mylar® designates the historic range of biaxially oriented polyester (PET) films, originally developed by DuPont Teijin Films and now marketed by Celanese. ADDEV Materials distributes and converts Mylar® films for industrial clients in the energy, mobility, and electronics sectors. Each reference is available from multi-site stock in Europe and North America, with integrated converting capabilities: slitting, cutting, laminating, and combining. Our ADDEV’TECH team supports design offices from the feasibility phase.
Mylar® is a biaxially oriented polyethylene terephthalate (PET) film, produced since 1952. It combines high dielectric strength of up to 300 kV/mm on thin thicknesses, good dimensional stability, and superior mechanical resistance to other plastic films.
The brand was created by DuPont, developed within the DuPont Teijin Films joint venture, and subsequently taken over by Celanese. Mylar® film is recognised under reference UL QMFZ-E93687 for its use in electrical insulation. It covers thicknesses from 6 to 480 µm, in transparent, translucent, and milky finishes.
This combination of properties explains why Mylar® remains a benchmark in motor insulation, transformers, and electric mobility batteries.
Mylar® is superior for four verifiable technical reasons, recognised by electrical insulation engineers and design offices for over seventy years:
Dielectric strength 23 kV for 250 µm — UL reference
Continuous temperature range: -70 °C to +150 °C
Resistance to solvents, oils and aromatic derivatives
Dimensional stability ≤ 0.8 % at 190 °C / 5 min
ADDEV Materials distributes the entire Mylar® Specialty Films catalogue. The table below shows the main references with their typical applications.
| Reference | Aspect | Thicknesses (µm) | Main applications |
|---|---|---|---|
| Mylar® A (hazy) | Translucent | 6 – 100 | Motor insulation, electrical laminates, release films |
| Mylar® A (milky) | Milky | 125 – 480 | High voltage isolation, motor slots, transformers |
| Mylar® EL | Translucent | 12 – 350 | Low / medium voltage electrical isolation |
| Mylar® FR (flame retardant) | Translucent | 50 – 190 | Railway applications (EN 45545), electromobility |
| Mylar® PMX | Opaque white | 100 – 350 | Backlighting, optics, signage |
| Metallised Mylar® | Aluminised | 12 – 50 | Vapour barrier, thermal insulation, aerospace MLI |
| Mylar® silicone-coated (S1F) | Translucent | 23 – 100 | Liner, adhesive backing, temporary protection |
For applications combining dielectric insulation and superior thermal resistance, ADDEV Materials offers its proprietary laminates MYLARCELLITE® (Mylar® + Kraft ou panneau transformateur) et THERMEX® (Mylar® + Nomex®) in duplex and triplex, manufactured in our European workshops.
The values below correspond to standard Mylar® A, manufacturer's data DuPont Teijin Films / Celanese.
Mylar® films are used in critical electrical and thermal insulation applications, particularly in ADDEV's strategic markets:
Beyond distribution, ADDEV Materials transforms Mylar® films at its 15 industrial sites in Europe and North America. Our ADDEV’TECH technical support assists the client in 4 phases: feasibility, study & development, pre-industrialisation, and series production.
Four concrete reasons distinguish ADDEV Materials as a Mylar® partner:
ADDEV Materials is certified ISO 9001, ISO 13485, IATF 16949 and ISO 14001 (site Pittsburgh, USA), EN 45545 for the railway, and obtained the ranking EcoVadis Platinum — Top 1 % in February 2025.
Looking for a Mylar® grade for your electrical insulation, electric mobility, rail, or energy storage applications? Speak to an ADDEV expert to identify the Mylar® reference that suits your specifications.
Mylar® and Melinex® are both biaxially oriented PET films, historically from DuPont Teijin Films, now Celanese. Mylar® is positioned for industrial and electrical applications, whereas Melinex® tends to cover graphic, optical, and general industrial applications.
For a low or medium voltage motor notch liner, thicknesses of 125 to 250 µm in milky Mylar® A are most common. For increased thermal stress (Class H), the Thermex® Triplex laminate 50 µm Nomex® / 190 µm Mylar® / 50 µm Nomex® offers a rating of 220 °C.
Standard Mylar® grades are not FR rated. Mylar® FR (flame retardant) grade meets the requirements of the EN 45545-2 standard on fire behaviour of railway materials. ADDEV Materials, EN 45545 certified, supplies these films to OEMs and manufacturers in the sector.
Yes. ADDEV Materials integrates converting operations: slitting from 3 to 2,000 mm with a tolerance of ± 0.1 mm, rotary die-cutting, kiss-cutting, CNC cutting, and press stamping. Parts can be delivered in rolls, sheets, or individual formats according to your process.
For standard references held in stock (Mylar® A, common thicknesses from 23 to 250 µm), delivery times are short thanks to multi-location stock in Europe and North America. For special grades (FR, metallised, silicone-coated) and custom formats, please consult our ADDEV'TECH team for precise delivery times.
Mylar® A has a dielectric strength of 23 kV for a thickness of 250 µm, which is up to 300 kV/mm on very thin thicknesses. Its continuous operating temperature ranges from 105 to 130 °C mechanically and up to 155 °C for electrical applications (Class F). It is UL recognised QMFZ-E93687.
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