Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Wacker HDK W7520 Fumed Silica Dispersion

Wacker HDK® W7520 is a high-performance fumed silica dispersion in water, part of Wacker’s HDK® series. It delivers excellent rheology control, thixotropy, and stability for coatings, adhesives, and sealants. With low viscosity and easy integration, it enhances anti-sedimentation and sag resistance without compromising clarity or processing efficiency.
  • wacker hdk w7520 fumed silica dispersion_6a2d863d
  • wacker hdk w7520 fumed silica dispersion_6a2d863d

Features Of Wacker HDK W7520 Fumed Silica Dispersion

  1. Stabilized aqueous dispersion with consistent rheology control and low viscosity at high silica loading.

  2. Highly surface-treated fumed silica offering excellent compatibility with water-based polymer systems.

  3. Ready-to-use liquid format eliminates dust hazards and simplifies handling versus dry fumed silica powders.

  4. Delivers superior thixotropy and anti-sag performance in demanding vertical applications.

  5. Non-ionic, low-VOC formulation suitable for eco-sensitive industrial and coating formulations.

Typical Applications Of Wacker HDK W7520 Fumed Silica Dispersion

  1. Water-based architectural and industrial coatings.

  2. Construction adhesives and tile grouts requiring sag resistance.

  3. Printing inks and flexographic formulations needing controlled flow behavior.

  4. Fire-retardant intumescent coatings for passive fire protection.

  5. Waterborne sealants and caulks requiring long-term storage stability.

Specifications Of Wacker HDK W7520 Fumed Silica Dispersion

Chemical TypeSurface-modified fumed silica in aqueous dispersion
Product FormLiquid dispersion (non-ionic)
AppearanceOpaque white to off-white viscous liquid
Silica Content (w/w %)20 ± 1 %
pH (25 °C)5.5 – 7.0
Viscosity (25 °C, mPa·s)3,000 – 6,000 (Brookfield RV, spindle #3, 12 rpm)
Storage Stability≥ 6 months at 5–30 °C, no phase separation or sedimentation
Key FeaturesThixotropic agent, anti-settling aid, rheology modifier


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