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

WACKER Fumed Silica HDK

WACKER HDK Fumed Silica Series combines flame-hydrolyzed manufacturing with tunable surface chemistry to deliver precision rheology control across polar and non-polar matrices. The series offers both hydrophilic and organosilane-modified variants, and composite systems.

Hydrophobic grades enhance flowability in silicone rubbers and solvent-based formulations through tailored siloxane treatments, while hydrophilic variants stabilize waterborne systems by forming hydrogen-bonded networks that prevent pigment settling.

Applications span epoxy crack repair UV-resistant paints, and high-strength polyurethane adhesives, with select grades meeting stringent purity standards for pharmaceutical excipients.


  • wacker-hdk
  • wacker-hdk

Features Of WACKER Fumed Silica HDK

  1. Surface Modification: Hydrophobic or hydrophilic treatments (e.g., HMDS, DDS) for tailored water resistance and compatibility

  2. Rheology Control: Provides thixotropic behavior, anti-settling, and viscosity stabilization in liquid systems (e.g., coatings, adhesives)

  3. Reinforcement: Enhances mechanical strength in silicone rubber (HTV/LSR), composites, and polymers while maintaining optical clarity

  4. High Purity & Consistency: Synthetic amorphous silica with controlled particle size (nano-scale)

  5. Multi-Functionality: Acts as flow aid, anti-blocking agent, and catalyst support across formulations

Typical Applications of WACKER Fumed Silica HDK

  1. Coatings & Inks: Improves pigment stability, anti-sagging, and corrosion resistance in epoxy/polyurethane systems

  2. Silicone Rubber: Reinforces HTV/LSR with high transparency and tensile strength

  3. Adhesives & Sealants: Optimizes thixotropy and cohesion in polyurethane, epoxy, and STP formulations

  4. Cosmetics & Personal Care: Provides matting, oil absorption, and texture enhancement in sunscreens/makeup

Specifications Of WACKER Fumed Silica HDK


ModelBET Surface Area (m²/g)pH ValueSiO₂ Content (%)TypeResistivity (Ω·cm)
HDK T40400±403.8-4.399.8Hydrophilic>10¹³
HDK H1790 (hydrophobic), 130-170 (hydrophilic)4.0-6.8>99.8Hydrophobic>10¹³
HDK H2000125-175 (hydrophilic), 170-230 (hydrophobic)6.5-8.0>99.8Hydrophobic>10¹³
HDK H15~120 (hydrophobic)/>99.8Hydrophobic>10¹³
HDK H18~120 (hydrophobic), 170-230 (hydrophilic)/>99.8Hydrophobic>10¹³


ModelBET Surface Area  (m²/g)pH of 4% DispersionSilica Content (%)
N20ST170-2303.8-4.3>99.8%
N20P170-2303.8-4.3>99.8%
N20D150-2303.8-4.3>99.8%
V15ca.1203.8-4.3>99.8
N20170-2353.8-4.3>99.8%




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