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

HIFULL HB-620 Hydrophobic Fumed Silica

HIFULL HB-620 is a high-quality hydrophobic fumed silica, modified by HMDS post-chemical treatment from hydrophilic fumed silica with 200㎡/g BET. It has strong hydrophobicity, stable thixotropy, efficient reinforcement and flow aid, suitable for silicone rubber, coatings and adhesives.


Features Of HIFULL HB-620 Hydrophobic Fumed Silica

  1. HMDS targeted modification – uniformly treated with hexamethyldisilazane, stable hydrophobicity, hydrolysis and moisture resistance, improving long-term storage of formulas

  2. Stable rheological control – excellent thixotropic performance, anti-sagging and anti-sedimentation, optimizing construction and molding effect of coatings and adhesives

  3. Efficient elastomer reinforcement – as the core reinforcing filler for silicone rubber, significantly enhancing mechanical strength, toughness and aging resistance of products

  4. Powder flow aid & anti-caking – effectively improving powder fluidity, preventing caking, optimizing powder processing and storage convenience

  5. High purity & low impurity – high silica content and extremely low impurities, suitable for high-end transparent products and electronic related applications

Typical Applications Of HIFULL HB-620 Hydrophobic Fumed Silica

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

  2. Paints/inks – thixotropic anti-sagging and anti-pigment sedimentation, enhancing film flatness, scratch resistance and weatherability

  3. Adhesives/sealants – optimizing rheological properties and bonding strength, enhancing long-term waterproof sealing reliability

  4. Powder coatings/toners – flow aid and anti-caking, improving powder processability and finished product appearance quality

  5. Industrial defoaming systems – relying on strong hydrophobicity to improve defoaming efficiency and long-term stability, suitable for various defoaming scenarios

Specifications Of HIFULL HB-620 Hydrophobic Fumed Silica

AppearanceWhite fluffy powder
ModifierHMDS (Hexamethyldisilazane)
SiO₂ Content (based on ignited product)≥99.8%
BET Surface Area170 ± 30 m²/g
Carbon Content (based on product dried at 105℃)1.5–2.5%
pH Value (4% dispersion, H₂O:Ethanol=1:1)6.0–9.0
Loss on Drying (105℃, 2h)≤0.7%
Loss on Ignition (1000℃, 2h)≤4.0%
Tap Density40–60 g/L
Primary Particle Size10–15 nm
Iron Content≤30 ppm


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