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

HIFULL HB-135 Hydrophobic Fumed Silica

HIFULL HB-135 is a high-quality hydrophobic fumed silica, post-chemically modified with HMDS. It has high specific surface area, high transparency, low thickening, strong reinforcement, thixotropic anti-sedimentation and flow aid, with good dispersibility, suitable for silicone rubber and adhesives.


Features Of HIFULL HB-135 Hydrophobic Fumed Silica

  1. Deep hydrophobic modification – deeply treated with hexamethyldisilazane, moisture-proof and hydrolysis-resistant, improve long-term storage stability of formulas

  2. Low thickening & high transparency – mild and controllable thickening effect, no impact on product transparency, suitable for high transparency scenarios

  3. Efficient reinforcement – excellent reinforcement performance in silicone rubber filling, significantly enhance product strength, toughness and service life

  4. Excellent thixotropy & anti-sedimentation – effectively prevent particle sedimentation in the system, maintain uniform stability, optimize construction and use performance

  5. Easy dispersion & processing – fluffy white powder, no agglomeration, fast wetting and dispersion, suitable for various production processes, reducing processing costs

Typical Applications Of HIFULL HB-135 Hydrophobic Fumed Silica

  1. Silicone rubber products – suitable for RTV-1, RTV-2, LSR and other silicone rubbers, efficiently reinforcing and improving mechanical properties and service life

  2. Adhesives/sealants – improving thixotropy and bonding strength, enhancing waterproof sealing performance and long-term reliability

  3. Defoamers – relying on hydrophobic properties to improve defoaming efficiency and durability, suitable for various defoaming systems

  4. Toner – as a flow aid to improve powder fluidity and optimize toner dispersion and printing performance

  5. Powder coatings – anti-caking and flow aid, enhancing coating processability and construction leveling

Specifications Of HIFULL HB-135 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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