HDK® Pyrogenic Silica - Wacker Chemie AG


HDK® Pyrogenic Silica

HDK® pyrogenic silica is a mature product produced by WACKER for over 40 years and used by customers worldwide with great success. Due to our integrated production system with its statistical process control and highly efficient reactor dynamics, the pyrogenic silica we produce is exceptionally pure.

Our broad range of hydrophilic and hydrophobic HDK® grades and HDK® dispersions offers you a variety of different solutions to meet all kinds of requirements in the following fields: accumulators, CMP, composites (synthetic resins), printing inks, electrics, electronics, paints and coatings, joint sealants, animal feed, insulating gels, adhesives, cosmetics, foodstuffs, natural and synthetic rubber, paper coating, pharmaceuticals, PVC, bulk materials, silicone elastomers, textile impregnation, toners and developers.

HDK® improves the performance, stability and handling of your systems and formulations at all phases of production and processing.

HDK® exhibits impressive performance characteristics. But, above and beyond selling you a product, we also provide, as your partner, comprehensive and in-depth technical support for your specific applications. Our acknowledged specialists and our applications labs will be glad to help you optimize your products and formulations.

We will also look at the individual phases of your business processes, and, together with you, develop new and innovative solutions and improvements. Now that alternative packaging and transport systems are available for almost all of our products, we will look at your workflows and together decide which systems work best for you. In this way, we can help guarantee maximum efficiency of your production process.

Rheology Control with HDK®


Hydrophilic HDK®

Hydrophilic HDK® is manufactured by hydrolysing volatile chlorosilanes in an oxyhydrogen flame. In chemical terms, the loose white powder consists of highly pure amorphous silicon dioxide. Hydrophilic silica is wetted by water and can be dispersed in water.

Hydrophobic HDK®

Hydrophobic HDK® is produced by the chemical modification of hydrophilic HDK® with reactive silanes, e.g. chlorosilanes or hexamethyldisilazane. It has water-repellent properties and is no longer dispersible in water.

HDK® for toners

Pyrogenic silica is an essential component of modern toners and developers. WACKER develops, produces and supplies specially formulated pyrogenic silica grades for this sector.

The product range comprises pyrogenic silica grades of both low and high specific surface area (BET). They are treated so that they can be triboelectrically charged - either positively or negatively. These products are suitable as components of standard toner and chemical toner formulations.