WACKER SILRES H62C 25kg – Silicone Resin for Electrical Insulation and Impregnation, UL 94 V-0, Thermal Class C

SILRES H62C is a high-grade, one-component, solvent-free, thermally cured silicone resin designed for advanced insulation and impregnation applications in electrical engineering and the drive industry. The material has been developed for operation under extreme temperature conditions, where standard organic systems lose their performance.

Thanks to its very good flowability and deep penetration capability, SILRES H62C is ideally suited for winding impregnation using dip processes as well as VPI (Vacuum Pressure Impregnation). It effectively penetrates gaps between conductors and structural components, forming a homogeneous insulation system that stabilizes windings, improves heat dissipation, and increases the mechanical strength of the entire assembly.

After curing, the resin forms a hard, thermally stable, and hydrophobic structure resistant to moisture, oils, chemicals, and aging processes. The material features excellent dielectric properties and high electrical strength, making it suitable for long-term operation in electrical equipment exposed to high voltages and elevated temperatures.

One of the key advantages of SILRES® H62 C is its exceptionally high thermal resistance, confirmed by an RTI rating of up to 239 °C. This allows its use in electrical machines operating in temperature classes far exceeding the capabilities of conventional electrical insulating varnishes. The solvent-free formulation also supports modern, more sustainable manufacturing processes.

Key properties

• one-component, thermally cured silicone resin

• solvent-free formulation

• very good flowability and winding penetration

• excellent dielectric properties

• high resistance to moisture, oils, and chemical agents

• outstanding thermal stability – RTI up to 239 °C

• resistance to aging and long-term thermal loads

• suitable for dip and VPI processes

Applications:

• impregnation of electric motor windings

• generators and alternators

• traction motors and railway drives

• e-mobility motors and industrial drives

• transformers and chokes

• heating elements and high-temperature systems

• applications requiring the highest class of electrical insulation

Summary – typical motor applications
SILRES® H62C is particularly recommended for impregnation and insulation of:

• traction motors (railway, metro, tram systems),

• high-power asynchronous and synchronous motors,

• continuously operated industrial drive motors,

• e-mobility motors and special drive systems,

• generators and electrical machines exposed to high temperatures.

SILRES® H62 C is a solution for manufacturers and service providers of electrical machines who require maximum thermal resistance, long insulation service life, and full reliability in critical applications. It performs wherever durability and electrical safety are essential to the overall system.