Insulating Varnishes: Essential Protection in Automation and Electrical Engineering

In today's electrical systems and automation, reliability and safety are an absolute priority. Specialist insulating varnishes play a key role in ensuring the longevity of components and protection against adverse external factors. At DACPOL, in the insulating materials department, we offer a wide selection of products that help maintain the highest efficiency of devices.

What are insulating varnishes and why are they crucial?

Insulating varnishes are specially composed resins and chemical mixtures, used to coat and protect motor windings, transformers, coils, and printed circuit boards (PCBs). Their main function is to create a durable, non-conductive protective layer. In a world where miniaturization and high thermal loads are the norm, these varnishes constitute the first line of defense against failures and damage.

Key benefits of using varnishes:

• Increased electrical strength of the insulation.
• Protection against moisture, chemicals, and corrosion.
• Improved heat exchange (heat dissipation).
• Damping of winding vibrations (preventing "humming").

Types of insulating varnishes in the insulating materials offer

Depending on the application requirements, different types of varnishes are used, characterized by different thermal, chemical, and mechanical properties.

Epoxy and polyurethane (PUR) varnishes

Epoxy and polyurethane-based varnishes are valued for their exceptional chemical and mechanical resistance. PUR varnishes perfectly protect against moisture and corrosion while being flexible. They are often used to protect electronics operating in difficult environmental conditions.

Acrylic and silicone varnishes

Acrylic varnishes offer quick drying and easy application. They are ideal for protection against moisture and mold. Silicone varnishes, on the other hand, are specialists in extreme temperatures, maintaining flexibility over a wide thermal range, which makes them an ideal choice for applications in motors and heaters.

Impregnation and potting varnishes (resins)

These products are essential for securing coils and windings. Impregnation varnishes penetrate deep into the winding structure, eliminating voids and vibrations. Potting resins create a hard, uniform layer completely surrounding the component, ensuring the highest level of mechanical and environmental protection.

How to choose the ideal varnish for your project?

Choosing the right varnish depends on several key factors:

• Thermal Class: The varnish must withstand the maximum operating temperature of the component (e.g., class F, H, C).
• Chemical resistance: Will the component be exposed to oils, fuels, or aggressive solvents?
• Drying and curing speed: Important for the efficiency of the production process.
• Application method: Should the varnish be applied with a brush, by dipping (impregnation), or by spraying?

Our specialists from the insulating materials department are at your disposal to help you select the most optimal product that will ensure the maximum reliability of your systems.