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
Polar System Optimization: Tailored for vinyl/epoxy/PU resins with dimethylsiloxy surface modification
Shear-Responsive Thixotropy: Forms reversible networks (low-shear viscosity: 7000-9500 mPa·s)
Enhanced Durability: Improves scratch resistance and sag control in high-build coatings
Thermal Stability: Maintains performance up to 300°C in silicone rubber
Low Moisture Impact: <0.6% water content ensures storage stability
Structural Adhesives: Thickener for epoxy/amine systems in automotive composites
Cable Gels: Dielectric modifier in insulation materials
Marine Coatings: Anti-sag agent for zinc-rich epoxy paints
Cosmetics: Flow enhancer in anhydrous formulations (INCI: Silica Dimethyl Silylate)
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 | - | - |
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
Have a Questions? Call Us:
Add:
Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China