Electrical Insulating Films from Gotthardt Isolierteile GmbH
Electrical insulating films are specially developed films used as insulators in electrical systems. They prevent the flow of current between conducting parts and provide protection against moisture, chemicals or mechanical loads.
What are electrical insulating films?
Electrical insulating films consist of thermoplastic or thermosetting plastics and are used in numerous electrical and electronic applications. They provide reliable electrical insulation together with high mechanical loadability.
Properties of electrical insulating films
- Excellent electrical properties with high dielectric strength
- Heat resistance up to 130 °C and above (depending on material)
- Tear resistance against tensile and compressive loads
- Chemical resistance against solvents and insulating oils
Differences between Mylar and PETP
Mylar is a well-known brand of DuPont for polyester films with excellent electrical properties and flexibility. PETP (polyethylene terephthalate) is characterized by its biaxial orientation (stretched in two directions), is available in various thicknesses and offers particularly high mechanical stability.
The main difference: Mylar is optimized for applications requiring extreme electrical insulation and flexibility, while PETP excels through mechanical stability and chemical resistance.
Manufacture of electrical insulating films
Electrical insulating films are produced by extrusion and biaxial stretching. The two-directional stretching selectively improves mechanical properties such as heat resistance and tear resistance.
What applications do polyester films have?
Application areas in electronics
- Interlayer and cover-layer insulation in transformers and motors
- Circuits and chokes
- Slot and phase insulation in electric motors
- Insulation of cables and lines
Use in transformers and motors
Polyester films such as Mylar or PETP are frequently used as insulating materials in transformers and electric motors because they offer high thermal and electrical loadability.
How do you select the right film?
Important selection criteria
The choice of the right electrical insulating film depends on several factors:
- Tear resistance: For mechanically stressed applications
- Heat resistance: For use at high operating temperatures
- Chemical resistance: For contact with insulating oils or solvents
- UL certifications: For safety-critical applications according to UL 94 standards (e.g. VTM-2)
Recommended film types
- Mylar: For applications with high electrical requirements
- PETP: When mechanical stability and chemical resistance are decisive
- Polyimide: For extreme temperatures above 150 °C
Advantages of polyester films
Polyester films offer high dielectric strength and extremely low conductivity for electrical insulation. They remain stable and durable under various conditions. Their versatility makes them the preferred material in electrical engineering.
Customized solutions and lamination
Gotthardt Isolierteile GmbH offers individually tailored solutions, including lamination, to meet specific requirements such as slot wedges and slot liners or slot insulation.
How are electrical insulating films used?
In the manufacture of insulated components
- Chokes and relay coils: Electrical insulating films provide reliable electrical insulation
- Circuits: Protection against flashovers and short circuits
In transformers and electric motors
Electrical insulating films are used as interlayer and cover-layer insulation in transformers and as phase insulation in electric motors to ensure safe operation.
GOBA Takeaway
Electrical insulating films are indispensable in modern electrical engineering. Whether as winding insulation in transformers, as slot insulation in electric motors or as protective material in electronic assemblies, the right film ensures operational safety and longevity of electrical systems.