Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

WACKER Hydrophobic Fumed Silica HDK H20

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

Features Of WACKER Hydrophobic Fumed Silica HDK H20

  1. Hydrophobic Mastery: -OSi(CH3)₂ modification enhances dispersion in non-polar systems by 50%, oil absorption 300 ml/100g

  2. Thixotropic Control: 3-5% dosage in silicones increases tear strength by 80%, thixotropic index 3.5 (ASTM D1646)

  3. Broad Compatibility: Stable in silicones/UV coatings/inks (pH 3.8-4.8), excellent silicone resin affinity

  4. Optical Clarity: Refractive index 1.46, <5% haze in transparent gel coats

  5. Eco-Safe: FDA 21 CFR 175.300 compliant, APEO/heavy metal-free, >70% biodegradability

Typical Applications Of  WACKER Hydrophobic Fumed Silica HDK H20

  1. Silicone Rubber: Reinforces HTV/RTV silicones with 40% higher tear resistance

  2. Industrial Coatings: Anti-sagging in epoxy floors, >1000h salt spray resistance

  3. Cosmetics: Anti-settling in nail polish/lip gloss (72h stability test passed)

  4. Electronics: Cable gels with >10¹⁵ Ω·cm volume resistivity

  5. Printing Inks: Flexo inks achieve 300 m/min printing speed

Specifications Of WACKER WACKER Hydrophobic Fumed Silica HDK H20

Silica Density-g/l2200
Silanol Group Density-SiOH/nm²1
Electrical Resistance (Density 40 g/l)-Ω·cm>10¹³
BET Surface Area (Hydrophobic Fumed Silica)DIN ISO 9277/DIN 66132m²/g~170
Physicochemical Properties


BET Surface Area (Hydrophilic Fumed Silica)DIN ISO 9277/DIN 66132m²/g170–230
Carbon Content-%~1.1
pH (4% Dispersion)DIN EN ISO 787-9-3.8–4.8
Bulk DensityDIN EN ISO 787-11g/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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