Leveraging advanced thermo-mechanical properties, Wacker HDK H20 is a hydrophobic fumed silica modified with dimethylsiloxane groups (1.1% carbon content). Its unique structure (contact angle >120°) with 170±30 m²/g surface area and ≥99.8% SiO2 purity delivers exceptional performance in silicone reinforcement and coating rheology control, while >10¹³ Ωcm resistivity ensures electrical insulation
Hydrophobic Mastery: -OSi(CH3)₂ modification enhances dispersion in non-polar systems by 50%, oil absorption 300 ml/100g
Thixotropic Control: 3-5% dosage in silicones increases tear strength by 80%, thixotropic index 3.5 (ASTM D1646)
Broad Compatibility: Stable in silicones/UV coatings/inks (pH 3.8-4.8), excellent silicone resin affinity
Optical Clarity: Refractive index 1.46, <5% haze in transparent gel coats
Eco-Safe: FDA 21 CFR 175.300 compliant, APEO/heavy metal-free, >70% biodegradability
Silicone Rubber: Reinforces HTV/RTV silicones with 40% higher tear resistance
Industrial Coatings: Anti-sagging in epoxy floors, >1000h salt spray resistance
Cosmetics: Anti-settling in nail polish/lip gloss (72h stability test passed)
Electronics: Cable gels with >10¹⁵ Ω·cm volume resistivity
Printing Inks: Flexo inks achieve 300 m/min printing speed
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 | ~170 |
Physicochemical Properties | |||
BET Surface Area (Hydrophilic Fumed Silica) | DIN ISO 9277/DIN 66132 | m²/g | 170–230 |
Carbon Content | - | % | ~1.1 |
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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