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

Tokuyama REOLOSIL QS-25 Hydrophilic Fumed Silica

Tokuyama REOLOSIL QS-25 is a hydrophilic fumed silica imported from Japan. It features medium-high specific surface area and strong rheology control, with efficient reinforcement and high transparency, designed for coatings, silicone rubber and high-end adhesives.


Features Of Tokuyama REOLOSIL QS-25 Hydrophilic Fumed Silica

  1. Medium-high specific surface area reinforcement – greatly improve tensile strength and tear resistance of silicone rubber and adhesives

  2. Strong rheology control – precisely adjust liquid thixotropy, prevent sagging and sedimentation, improve construction fluency

  3. High transparency and low turbidity – suitable for transparent formulations, no impact on clarity, enhance product appearance

  4. Easy dispersion – fluffy white nano-powder, convenient to add, uniform mixing, reduce processing energy consumption

  5. Broad compatibility – compatible with water-based/UV systems, with anti-caking and flow aid functions

Typical Applications Of Tokuyama REOLOSIL QS-25 Hydrophilic Fumed Silica

  1. Coating systems – water-based/UV coatings, leather finishing, thickening and anti-sagging, improve transparency and weather resistance

  2. Silicone rubber products – reinforcement for HCR-RTV-2K silicone rubber, improve toughness, insulation and service life

  3. High-end adhesives – thickening and thixotropy, prevent filler sedimentation, enhance bonding strength

  4. Printing inks – thickening and anti-settling, endow good colorability, leveling property and water resistance

  5. Cosmetics field – adjust texture, improve skin feel, act as stabilizer to enhance dispersion stability

Specifications Of Tokuyama REOLOSIL QS-25 Hydrophilic Fumed Silica

AppearanceFluffy white nano-powder
SiO₂ Content (dry basis)>99.9%
BET Surface Area240–280 m²/g
Primary Particle SizeApproximately 14 nm
pH Value (4% suspension)4.0–4.5
Moisture Content<1.5%
Bulk DensityApprox. 50 g/L
44μm Sieve Residue<0.01%


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