WACKER HDK H15 is a hydrophobic fumed silica (150±30m²/g) for rheology control. With 99.8% SiO₂ purity and 12nm particle size, it enhances anti-settling in coatings and reinforces silicone rubbers, available in 10kg bag
Surface Modification: Dimethyldichlorosilane-treated for hydrophobicity
Rheology Control: Reduces pigment settling by 50% in solvent-based systems
Mechanical Reinforcement: Improves silicone rubber tensile strength by 30%
Thermal Stability: Maintains performance up to 300°C
Electrical Properties: >10¹³ Ωcm resistivity for cable gels
Low Moisture: <0.6% water content (105°C)
Silicone Sealants: RTV-1K thickening and storage stability
Industrial Coatings: Anti-sagging in high-build paints
Cosmetics: Flow modifier for nail polish/lip gloss
Printing Inks: Adjusts rheology in offset/flexo inks
Cable Compounds: Dielectric enhancer for insulation gels
Property | Standard Method | Unit | Value/Specification |
Silica content | DIN EN ISO 3262-19 | % | >99.8 |
Silica density | - | g/l | 2200 |
Silanol group density | - | SiOH/nm² | 1 |
Electrical resistance (density 40 g/l) | - | Ω·cm | >10¹³ |
BET surface area (hydrophobic fumed silica) | DIN ISO 9277/DIN 66132 | m²/g | ~120 |
Physicochemical Properties | |||
BET surface area (hydrophilic fumed silica) | DIN ISO 9277/DIN 66132 | m²/g | 130–170 |
Carbon content | - | % | ~0.8 |
pH (4% dispersion) | DIN EN ISO 787-9 | - | 3.8–4.8 |
Bulk density | DIN EN ISO 787-11 | g/l | ~40 |
Loss on drying (105°C, 2h) | DIN EN ISO 787-2 | % | <0.6 |
Residue on sieve (>40 μm) | DIN EN ISO 787-18 | % | <0.05 |
Surface modification | - | - | –OSi(CH₃)₂– |
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E-mail: wangxingqiang@ericwchem.com
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