Flexible Insulating Materials

Foundation of Reliability in Electrical Engineering

At the heart of every electric motor, transformer, or generator lie materials that are not visible at first glance, but which determine their long-term and trouble-free operation. We are talking about flexible insulating materials. At DACPOL, in the insulating materials department, we offer a wide range of products that are crucial for protecting windings and ensuring the stability of electrical systems in the most demanding applications.

Role and application of flexible insulation

Flexible insulation, available in the form of sheets, rolls, tapes, or finished slot liners, acts as a dielectric barrier. Their main task is the electrical separation of conductors and windings from metal cores and machine casings, preventing short circuits and breakdowns. At the same time, thanks to their flexibility, they adapt perfectly to complex shapes, completely filling gaps and spaces.

Where flexible insulating materials are used:

• Slot insulation in electric motors and generators.
• Inter-turn and interlayer insulation in transformers and coils.
• Insulation of winding heads.
• Securing cable connections and terminations.

Key properties and temperature classes

The choice of the appropriate flexible material is directly related to its heat resistance – i.e., the temperature class. Our offer includes materials manufactured in classes from B (130°C) to H (180°C), which allows for precise matching to the machine's operating conditions. The higher the class, the greater the resistance to thermal aging and the longer the service life at elevated temperatures.

In addition to heat resistance, these materials are characterized by:

• Excellent dielectric properties (high breakdown strength).
• High mechanical resistance and flexibility.
• Resistance to moisture and many chemical agents.

Popular Types of Flexible Insulating Materials

At DACPOL, we offer various compositions that combine the advantages of different raw materials, creating so-called laminates:

Nomex and polyester (DMD/NMN)

Laminates based on polyester film (e.g., Mylar) with layers of polyester non-woven fabric (DMD) or Nomex aramid paper (NMN) are some of the most frequently used solutions. They offer an excellent combination of mechanical properties, flexibility, and thermal resistance (class F 155°C). They are ideal for automated insertion of slot insulation.

Non-woven fabrics and glass mats

Materials based on fiberglass impregnated with resins (e.g., silicone) are characterized by very high thermal resistance (even up to class H 180°C) and mechanical resistance. They are indispensable in heavy-duty motors and transformers where high thermal loads occur.

Electro-insulating tapes

A separate, but equally important category are flexible self-adhesive tapes. Used for bandaging windings, masking, labeling, and mounting, they must meet restrictive standards for electrical, mechanical, and chemical resistance, minimizing the risk of electrolytic corrosion of the conductor.

If you are looking for reliable and certified insulating materials for transformers, motors, or other electrical devices, contact our department. We will help you select the material that perfectly matches your temperature class and application method.