Impregnation Resin Systems

Impregnation Resin Systems

Impregnation of copper windings and coils provides secondary insulation, increases mechanical stability, improves heat dissipation, and adds protection from humidity, dirt and chemicals. Typical automotive applications are electric motor rotors and stators. Impregnation can vastly improve the efficiency and durability of the motor.

Optimal Resin Systems for Impregnation Processes

Typically, stator or rotor wires are first coated with a layer of varnish to provide primary insulation. After winding, impregnating resin fills all voids within the windings, and between the windings and laminations. Huntsman offers low-viscosity, high-thermal-class resins that are optimized for the most common impregnation processes used for automotive parts, including both one-component and two-component solutions for trickle and roll-dip impregnation.

Insulating Resin Systems for Electric Vehicles

Insulating Resin Systems for Electric Vehicles

Discover our ARALDITE® encapsulants and impregnation resins for electric motors, battery and power electronics. 


Frequently Asked Questions

How does impregnation improve the performance of electric motors?

Impregnation of rotors and stators improves heat transfer, which translates to higher motor efficiency. It also reduces the likelihood of motor failure in several ways. The resin increases the stiffness of the windings, reducing coil vibration and the corresponding risk of abrasion. The void-free insulation increases electrical performance, minimizing the risk of partial discharges.

How are Huntsman’s resin systems optimized for impregnation processes?

Huntsman’s one- and two-component resin solutions for impregnation processes exhibit low and stable viscosity, high thermal class, high dielectric strength, and high resistance to humidity and chemicals.

How do Huntsman’s simulation capabilities help customers to develop custom resin systems?

Huntsman’s automotive products have been developed over many years of leadership in the global electrical insulation sector, mainly for high-voltage applications. We continuously study and update our materials in order to deliver the shortest possible curing cycles and meet the most challenging productivity targets.

Huntsman’s process simulation is used to help design a production process tailored to each specific part. New resin selection, flow patterns, injection concepts, curing time and temperature can be modeled at the computer, and high-speed refinements identify any necessary improvements.

Tailored Technical Support


Simulation exercises can quickly demonstrate the limitations or the achievable characteristics for various sets of resins and processing parameters, thus reducing the number of real-world trials that must be conducted.

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Materials Testing

By putting our products through a wide range of physical and mechanical tests, we also generate the characterization data that is required to generate accurate digital simulations.

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Your production processes need to combine superior efficiency with exceptional end-product performance. With our processing help, you’ll need fewer trials to reach optimal quality and performance for each part.

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Resin Systems for
Electronic Components

Discover our wide range of electronics applications to protect your devices against chemical, mechanical and electrical loads.

Applications for Electronics

The Right Solution for Your Manufacturing Process

Discover our electronics processes and decrease your production waste and processing time.

Processes for Electronics