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

WACKER Hydrophobic Fumed Silica HDK H15

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

Features Of WACKER Hydrophobic Fumed Silica HDK H15

  1. Surface Modification: Dimethyldichlorosilane-treated for hydrophobicity

  2. Rheology Control: Reduces pigment settling by 50% in solvent-based systems

  3. Mechanical Reinforcement: Improves silicone rubber tensile strength by 30%

  4. Thermal Stability: Maintains performance up to 300°C

  5. Electrical Properties: >10¹³ Ωcm resistivity for cable gels

  6. Low Moisture: <0.6% water content (105°C)

Typical Applications Of  WACKER Hydrophobic Fumed Silica HDK H15

  1. Silicone Sealants: RTV-1K thickening and storage stability

  2. Industrial Coatings: Anti-sagging in high-build paints

  3. Cosmetics: Flow modifier for nail polish/lip gloss

  4. Printing Inks: Adjusts rheology in offset/flexo inks

  5. Cable Compounds: Dielectric enhancer for insulation gels

Specifications Of WACKER Hydrophobic Fumed Silica HDK H15

PropertyStandard MethodUnitValue/Specification
Silica contentDIN EN ISO 3262-19%>99.8
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~120
Physicochemical Properties


BET surface area (hydrophilic fumed silica)DIN ISO 9277/DIN 66132m²/g130–170
Carbon content-%~0.8
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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