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

WACKER Hydrophobic Fumed Silica HDK H18

WACKER HDK H18 is a hydrophobic fumed silica (120m²/g BET) for polar resin systems like epoxy/polyurethane. As a rheology modifier, it provides thixotropy and anti-settling in composites, adhesives, and coatings while enhancing mechanical strength

Features Of WACKER Hydrophobic Fumed Silica HDK H18

  1. Polar System Optimization: Tailored for vinyl/epoxy/PU resins with dimethylsiloxy surface modification

  2. Shear-Responsive Thixotropy: Forms reversible networks (low-shear viscosity: 7000-9500 mPa·s)

  3. Enhanced Durability: Improves scratch resistance and sag control in high-build coatings

  4. Thermal Stability: Maintains performance up to 300°C in silicone rubber

  5. Low Moisture Impact: <0.6% water content ensures storage stability

Typical Applications Of  WACKER Hydrophobic Fumed Silica HDK H18

  1. Structural Adhesives: Thickener for epoxy/amine systems in automotive composites

  2. Cable Gels: Dielectric modifier in insulation materials

  3. Marine Coatings: Anti-sag agent for zinc-rich epoxy paints

  4. Cosmetics: Flow enhancer in anhydrous formulations (INCI: Silica Dimethyl Silylate)

Specifications Of WACKER WACKER Hydrophobic Fumed Silica HDK H18

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)
-
[Ω·cm]
>10¹³
BET surface area (hydrophobic fumed silica)
DIN ISO 9277/DIN 66132
m²/g
ca.120
BET surface area (hydrophilic fumed silica)
DIN ISO 9277/DIN 66132
m²/g
170 - 230
Carbon content
-
%
ca.4.5
pH value of 4% dispersion
DIN EN ISO 787-9
-
-



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