WACKER HDK H17 is a hydrophobic fumed silica (150±20 m²/g) for polar systems. It provides superior thickening and thixotropy in epoxy/polyurethane formulations while enhancing mechanical properties in silicone rubbers and composites.
Surface Area: 150±20 m²/g BET for precise rheology control
Thermal Stability: Maintains performance up to 280°C
Hydrophobicity: Organosilane-treated for water resistance
Reinforcement: Improves HTV silicone tensile strength by 30%
Low Moisture:<0.7% water content (105°C)
Industrial Coatings: Anti-sagging agent for epoxy systems
Silicone Products: Reinforcing filler for HTV rubber
Adhesives: Thixotropy modifier in structural adhesives
Composites: Viscosity stabilizer for unsaturated polyesters
Performance | 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 |
BET surface area (hydrophobic fumed silica) | DIN ISO 9277/DIN 66132 | m²/g | ca.90 |
Physical and Chemical Performance Table | |||
Physical and Chemical Properties | Method | Unit | Value |
BET surface area (hydrophilic fumed silica) | DIN ISO 9277/DIN 66132 | m²/g | 130 - 170 |
Carbon content | - | % | ca.4.5 |
pH value of 4% dispersion | DIN EN ISO 787-9 | - | 4.0 - 6.8 |
Packing density | DIN EN ISO 787-11 | g/l | ca.50 |
Dry weight loss (105°C, 2h) | DIN EN ISO 787-2 | % | <0.6 |
Sieve residue (according to Mocker >40μm) | DIN EN ISO 787-18 | % | <0.2 |
Surface modification | - | - | OSi(CH₃)₂ - |
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