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

HIFULL HB-139 Hydrophobic Fumed Silica

HIFULL HB-139 is a high-quality hydrophobic fumed silica, made by modifying HL-200 hydrophilic fumed silica with PMDS. It has excellent thixotropic thickening, anti-sagging, reinforcement and flow aid, with strong stability and high transparency, suitable for silicone rubber, coatings and adhesives.

Features Of HIFULL HB-139 Hydrophobic Fumed Silica

  1. Exclusive PMDS modification – modified with polydimethylsiloxane, outstanding hydrophobicity and waterproofness, improve long-term storage stability of formulas

  2. Efficient thixotropy & anti-sagging – excellent thixotropic performance, effectively prevent system sagging, optimize construction convenience and product flatness

  3. Excellent reinforcement adaptability – significant reinforcement effect at high filling level of silicone rubber, no structuring effect, ensuring stable product performance

  4. High transparency & low interference – high transparency, no impact on the appearance of end products, suitable for transparent systems and high-cleanliness scenarios

  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-139 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-139 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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