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.
Polar System Expertise: Optimized for vinyl/epoxy/PU with permanent hydrophobicity
Shear-Thinning Performance: Delivers 6000-8000 mPa·s low-shear viscosity
Reinforcement: Increases tensile strength by 30% in silicone rubbers
Thermal Stability: Withstands 280°C in composite applications
Moisture Resistance:<0.5% water content for stable processing
Wind Energy Composites: Thixotropy control in epoxy laminates
Industrial Coatings: Anti-settling in zinc-rich primers
Electronics: Dielectric gel for high-voltage cable insulation
Cosmetics: Mattifying agent in sunscreens INCI: Silica
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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