CE Products

Hydrophobic Fumed Silica TP-20


CE Chemicals Hydrophobic Fumed Silica TP-20 is a high-performance reinforcing filler, thickener, and rheology modifier developed for use in coatings, sealants, adhesives, elastomers, and polymers.

General Information

CAS: 67762-90-7

Synonyms: Pyrogenic silica; Silica fume; Fumed colloidal silica; Silica, fumed; silicic amorphous silica; colloidal silicon dioxide

Counter Type: Evonik R202


Fumed Silica TP-20 is a fumed hydrophobic silica treated with polydimethylsiloxane with very good thickening properties.


  • Adhesives and Sealants
  • Epoxy Resin, Vinyl Resins and Gel Coats
  • Cable Gels


  • Highly efficient effect in the thickening and thixotropy of complex polar liquids.
  • Improves the water-resistance of moisture-sensitive formulations.
  • Improvement of the anti-settling behavior of pigments and anti-sagging behavior in epoxy coatings.
  • Used as a surface additive for toner particles to increase charge and improve flow-ability.


Properties Unit Value
Specific surface area(BET) m2/g 160±20
Loss on drying, 2h at 105 % ≤0.5
C content % 3.5-5.0
Tamped density g/l 60
pH value / 4.0-6.0
SiO2 content % ≥98

Packaging, Storage & Transportation

Packed in 10 kg kraft paper bags then secured with pallet, 200kg/pallet.

Keep in sealed containers in a dry, cool place.

Shelf Life

2 years

Product Overview

The manufacturing process of Hydrophobic Fumed Silica TP-20 begins with the vaporization of silicon tetrachloride (SiCl₄) in an oxygen-free atmosphere. This produces a high purity of silicon dioxide. The resulting vapor is then hydrolyzed and condensed to form fumed silica. Hydrophobic Fumed Silica TP-20 is highly dispersible, making it an ideal additive for coatings, sealants, adhesives, elastomers, and plastics. Hydrophobic Fumed Silica TP-20 is obtained from fumed silica with a specific surface area of 200, treated with Polydimethylsiloxane hydrophobic treatment.

Chemical properties of CE Chemicals Hydrophobic Fumed Silica TP-20:

  • Hydrophobic: treated with a surfactant to make the surface water repellent.
  • Fumed: produced by flame hydrolysis of silicon tetrachloride (SiCl₄) in an oxygen-free atmosphere.
  • TP-20: primary particle size of 14nm

The applications of CE Chemicals Hydrophobic Fumed Silica TP-20 include:

  • Rheology modifier: thickener and reinforcing filler
  • Coating: improve suspension, leveling, thixotropy, and resistance to sagging or running
  • Sealant: improve flowability, thixotropy, and durability
  • Adhesive: improve flowability, thixotropy, and adhesion to difficult substrates
  • Elastomer: improve compression set, abrasion resistance, and tear strength

Scratch Resistance & Hardness

Fumed silica raises the resistance of cured paints to mechanical stress. Its particles prevent scratching on a coating’s surface and improve its ability to radiate energy without causing major cracks.

    Sag Resistance

    Fumed silica particles are very effective in this domain due to their ability to network and span volume. In general, the thicker coating requires greater sag resistance.

      Anti-Settling Properties

      Due to its fume capacity, fumed silica prevents heavy pigment particles from settling in the coating. It forms a network within the layer in order to retain them.

        Corrosion Resistance

        Fumed silica improves the corrosion-preventive capability of a coating. The use of hydrophobic fumed silica particles aids in the prevention of water movement from the film’s surface to the substrate beneath it.

        Water, air, and an electrolyte cause aluminum substrates to corrode. The coating peels away from the substrate as a consequence of this reaction. Fumed silica prevents moisture from reaching the substrate, reducing blistering.

        If you have any questions about CE Chemicals Hydrophobic Fumed Silica TP-20, or if you would like to request a sample, please contact us. Our experts will be happy to assist you.

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