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Alternative Drives

WACKER silicones are the ideal materials for use in extreme conditions, such as those found in automotive applications, especially e-mobility. By protecting sensitive electronics while assisting with thermal management, our silicones allow for safe and economical implementation of electrification, autonomous driving and connectivity concepts. In addition, our silicones ensure the reliable operation of inductive charging and the heat / climate system (e.g. PTC or sheath heaters). Flame-retardant silicone coatings makes it possible to use lightweight laminates to separate individual compartments in the car, e.g. the battery from the passenger compartment.

General Benefits

  • Protection of engine components against moisture, environmental impacts, chemicals,coolants and fluids
  • Vibration damping (from -45 °C up to >180 °C)
  • Heat resistance (from 180 °C up to 230 °C continuous load) and active cooling support
  • Longer life and performance of electric insulation over a broad temperature and frequency range

Applications in Electric Motors:

  • Impregnation of electrical coils (rotor/stator) with silicone resins
  • Coil potting with silicone elastomers
  • Active cooling with silicone fluid
  • Protection of electrical connections by potting junction boxes and connector rings with silicone elastomers
  • Permanent magnet bonding with high tear-strength silicone adhesives

Applications for Gear Box Mounted Hybrid Module:

  • Active cooling
  • Permanent magnet bonding
  • Coil impregnation
  • Potting of coil connector rings/connection boxes

Applications for Direct Drive:

  • Active cooling
  • Coil impregnation
  • Potting of coil connector ring/connection box

General Benefits

  • Keep operating temperatures within an optimum range, connect elements to active cooling systems
  • Protect against moisture, oxidation, chemicals and vibration
  • Extend life and performance

Benefits for Battery Modules:

  • Dissipate heat (thermal management)
  • Couple cells with heat-sink elements (bonding)
  • Couple cells for vibration control (bonding)
  • Seal modules (CIPG – cured-in-place-gasket)

Benefits for Battery Pack Systems:

  • Dissipate heat (thermal management)/couple modules to active cooling
  • Seal modules (CIPG – cured-in-place-gasket)
  • Insulate high-voltage cables and seal connectors
  • Silicones for battery management systems
  • Protect electronic components (encapsulation)

Benefits for Battery Management Systems

  • Protect electronic components (encapsulation)


  • Sealing of battery module and battery housing
  • Bonding couple cells for vibration control
  • Thermal management coupling of cells / modules for active cooling
  • High-voltage cables and connectors
  • Potting of electronics in battery management system

Benefits Silicone Gaskets:

  • Chemically inert, i.e. their properties remain stable in a fuel-cell set-up and during operation, and do not negatively affect the fuel-cell performance
  • Excellent compression set, ensuring gas and coolant tightness and securing the fuel cell against leakage over its full lifetime
  • Excellent thermal and degradation resistance


  • Sealing bipolar plates (BPP)/membrane electrode assembly (MEA): dispensing/screen printing/injection molding
  • Sealing of housings
  • Potting of control electronics


  • Injection molding
  • Low-pressure injection molding
  • Screen printing
  • Dispensing
  • Potting
  • Sealing


  • Optimized heat dissipation and electrical insulation
  • Not modified with organic components
  • Very low volatility (suitable for vacuum pressure impregnation)
  • Is cured by heat through catalyzed addition cross-linking without the formation of byproducts
  • Remarkably insensitive during curing to the influence of various kinds of insulating materials
  • Can be processed at temperatures up to a maximum of 80°C to reduce viscosity
  • Contains no decomposable or physiologically problematic components
  • The vulcanizate conforms to the fire safety requirements defined in UL 94 V0


  • VPI (Vacuum Pressure Impregnation) of traction motors and of windings in electrical equipment with H- and C-class insulation
  • Protection of windings
  • Elimination of voids