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

Tokuyama REOLOSIL QS-25 Fumed Silica

Tokuyama REOLOSIL QS-25 is a high-purity fumed silica from the REOLOSIL® series, engineered for thickening, rheology control, and anti-settling in coatings, adhesives, and sealants. Its optimized surface chemistry ensures excellent dispersion and stability in both polar and non-polar systems while maintaining low viscosity buildup.
  • tokuyama reolosil qs 25 fumed silica_5f6347e5
  • tokuyama reolosil qs 25 fumed silica_5f6347e5

Features Of Tokuyama REOLOSIL QS-25 Fumed Silica

  1. Highly pure, pyrogenically produced amorphous silica with low sodium and heavy metal content.

  2. Optimized surface chemistry for excellent dispersion stability in polar and non-polar systems.

  3. Controlled particle size distribution enabling consistent rheology control and thixotropic behavior.

  4. Low bulk density and high specific surface area (~200 m²/g) supporting efficient reinforcement and thickening.

  5. Free-flowing, hydrophilic powder form compatible with standard dry-blending and in-situ dispersion processes.

Typical Applications Of Tokuyama REOLOSIL QS-25 Fumed Silica

  1. Thixotropic agent in solvent-based and high-solid coatings and paints.

  2. Rheology modifier in adhesives and sealants, especially silicone and polyurethane formulations.

  3. Anti-settling and anti-sag additive in industrial inks and pigment concentrates.

  4. Reinforcing filler in liquid silicone rubber (LSR) and RTV silicone compounds.

  5. Free-flow aid and binder support in pharmaceutical and nutraceutical powder blends.

Specifications Of Tokuyama REOLOSIL QS-25 Fumed Silica

Chemical TypeAmorphous fumed silica (SiO₂)
Product FormFree-flowing white powder
AppearanceWhite, odorless, fine particulate powder
Primary ApplicationsRheology control, anti-settling, reinforcement, thickening
Key FeaturesHydrophilic surface, high surface area, low impurity profile
Specific Surface Area (BET)Approx. 200 ± 20 m²/g
DBP Oil AbsorptionApprox. 230 ± 20 mL/100 g
Loss on Drying (105°C, 2 h)≤ 2.5 wt%


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