What Are Impregnating Resins?

Impregnating resins, also known as secondary insulation materials, are liquid resins that are diluted with reactive thinners. They cure completely on the object to which they are applied. They provide electrical insulation, high mechanical stability, protection from climate influences and improved heat dissipation for copper windings and coils. Impregnating resins are widely used in generators, electric motors and transformers as well as in other industrial fields.

Axalta’s Energy Solutions maintains a constant dialogue with leading electrical manufacturers. This allows for continuous improvement of the manufacturing processes and creation of products for a wide variety of requirements. Energy Solutions’ impregnating resins are available for all common processing techniques, including dip and bake, trickle, electrical UV, vacuum pressure impregnation process (VPI) and others.

The need to protect the environment has led to strict legislation on emission levels in most countries. Energy Solutions’ new generation of low-emission one-component impregnating resins addresses this situation. They produce lower emissions than ever before and add a new level of safety to the conventional impregnation process:

  • VOC-free for low emissions
  • No fire or explosion hazard
  • No Maximum Exposure Limit (MEL)
  • Improved thermo-mechanical stability

One-Component Resins for Dip and Bake and for Trickle Techniques

The Energy Solutions’ portfolio contains impregnating resins that are suitable up to thermal class 180 (H). Styrene- based, vinyltoluene-based and low emission systems can be used for the impregnation of electrical windings in motors and transformers. And it’s possible to have an environmentally responsible impregnating process with our monomer-free and low viscosity impregnating resins.

Additionally, these products can be used in the vacuum impregnation process (VI) and the vacuum pressure impregnation process (VPI).

Most Energy Solutions’ impregnating resins are UL-approved, which in turn makes the UL-approval for our customers even easier.

Energy Solutions’ Resins for Modern Impregnating Techniques

Energy Solutions’ resins can be processed in a fast and energy-saving way.

The shift in technology towards the electrical UV and hot dipping process combined with the low emission or monomer-free resins delivers effective solutions, outstanding quality and high performance.

The electrical UV process is an alternative to the conventional impregnating process. It’s a technological break-through that has resulted in short processing times, dramatically reduced emissions and minimal loss of resin. Another advantage of the process is the extremely small footprint - the manufacturing plant does not need bulky heating equipment. Instead, the complete impregnating technology is part of the overall inline manufacturing process.

Our low emission and monomer-free product portfolio enables our customers to use the hot dipping process, which provides high efficiency, low losses of resins, and excellent impregnating quality.