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

HIFULL HB-151 Hydrophobic Fumed Silica

HIFULL HB-151 is a high-performance hydrophobic fumed silica modified by DDS from HL-150 hydrophilic silica. It features stable hydrophobicity, efficient thixotropy, excellent reinforcement and flow aid, specially designed for electronic potting, silicone rubber and adhesives.

Features Of HIFULL HB-151 Hydrophobic Fumed Silica

  1. DDS deep hydrophobic modification – treated with dimethyldichlorosilane, stable hydrophobicity and hydrolysis resistance, improve shelf life

  2. Precise thixotropic control – balanced rheology, anti-sagging and anti-sedimentation, optimize application

  3. Electronic-grade stability – low impurity, high insulation, suitable for electronic potting

  4. Efficient reinforcement – greatly improve strength and toughness of silicone rubber

  5. Easy dispersion – fluffy powder, fast wetting, good processability

Typical Applications Of HIFULL HB-151 Hydrophobic Fumed Silica

  1. Electronic potting – insulation, reinforcement and rheology stability for electronic components

  2. RTV silicone rubber – thickening, thixotropy, longer shelf life

  3. Adhesives & sealants – better rheology and bonding strength

  4. Paints & inks – anti-sedimentation, anti-sagging, better film performance

  5. Powder coatings – flow aid, anti-caking, reduce white spots

Specifications Of HIFULL HB-151 Hydrophobic Fumed Silica

AppearanceFluffy white powder
ModifierHexamethyldisilazane (HMDS)
SiO₂ Content≥99.8%
BET Surface Area300±30 m²/g
Carbon Content3.5–6.5%
pH Value (4% dispersion, H₂O:Ethanol=1:1)7.0–8.5
Loss on Drying≤0.5%
Loss on Ignition≤8.0%
Tap Density40–60 g/dm³


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