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Pyrogenic silica is a mature product that WACKER has produced for over 50 years and is used by customers worldwide with great success. Thanks to our integrated production system with statistical process control and highly efficient reactor dynamics, we produce pyrogenic silica of exceptionally purity.

With HDK® you get not only great product performance, but also tailored customer service. Our specialists can offer you extensive applications support. They will work with you to develop process-focused solutions, providing comprehensive support with optimizing your products and formulations.


HDK® pyrogenic silica improves the performance, stability and handling of your systems and formulations at all phases of production and processing. HDK® is ideal for adjusting the flow properties of liquids and giving powders optimum free-flow properties.

Application Areas

HDK® optimizes processes and products across a wide range of applications and industries:

  • Accumulators,
  • Composites,
  • Printing inks, developers,
  • Paints,
  • Joint fillers,
  • Animal feed,
  • Insulating gels,
  • Adhesives,
  • Foodstuffs,
  • Coatings,
  • Natural and synthetic rubber,
  • Food products,
  • Pharmaceuticals,
  • PVC,
  • Bulk goods,
  • Silicone elastomers,
  • Thermal insulation,
  • Toners, and
  • Paper coating and textile impregnation.