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

WACKER Hydrophobic Fumed Silica HDK H2000

WACKER HDK H2000 is a hydrophobic fumed silica (150m²/g BET) for polar resin systems. This dimethylsilyl-modified additive enhances thixotropy in epoxy/PU formulations while improving mechanical strength and sag resistance.

Features Of WACKER Hydrophobic Fumed Silica HDK H2000

  1. Polar System Expertise: Optimized for vinyl/epoxy/PU with permanent hydrophobicity

  2. Shear-Thinning Performance: Delivers 6000-8000 mPa·s low-shear viscosity

  3. Reinforcement: Increases tensile strength by 30% in silicone rubbers

  4. Thermal Stability: Withstands 280°C in composite applications

  5. Moisture Resistance:<0.5% water content for stable processing

Typical Applications Of  WACKER Hydrophobic Fumed Silica HDK H2000

  1. Wind Energy Composites: Thixotropy control in epoxy laminates

  2. Industrial Coatings: Anti-settling in zinc-rich primers

  3. Electronics: Dielectric gel for high-voltage cable insulation

  4. Cosmetics: Mattifying agent in sunscreens INCI: Silica

Specifications Of WACKER WACKER Hydrophobic Fumed Silica HDK H2000

Property
Method
Unit
Value
Silica content
DIN EN ISO 3262-19
%
>99.8
Silica density

g/l
2200
Silanol group density

SiOH/nm²
0.5
Resistivity (density 40g/l)

[Ωcm]
>10¹³
Physical and chemical properties



Property
Method
Unit
Value
BET - surface area (hydrophilic gas-phase silica)
DIN ISO 9277/DIN 66132
m²/g
170 - 230
BET - surface area
DIN ISO 9277/DIN 66132
m²/g
125 - 175
Carbon content

%
ca.2.8
pH value of 4% dispersion
DIN EN ISO 787-9

6.5 - 8.0
Tapped density
DIN EN ISO 787-11
g/l
ca.200
Loss on drying (105℃, 2h)
DIN EN ISO 787-2
%
<0.6
Surface modification

-
OSi(CH₃)₃



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