Colloidal Silica

1. Product summary
  • Colloidal silicas are suspensions of fine amorphous, nonporous, and typically spherical silica particles in a liquid phase. Schematic representation of the silica gel surface. The surface of colloidal silica in contact with water is covered by siloxane bonds (≡Si–O–Si≡) and silanol groups (≡Si–OH). This makes colloidal silica very hydrophilic and capable of forming numerous hydrogen bonds.

    CAS No. 7631-86-9
2. Product Standard
Specific gravity (25℃) 1.19~1.22
SiO2 (wt%) 29~31
Na2O (wt%) 0.5%↓
pH 9~11
Viscocity (25℃) 10cps↓
Self-life 1year
3. Package
  • 20L, 200L DRUM
4. Application
  • In papermaking colloidal silica is used as a drainage aid. It increases the amount of cationic starch that can be retained in the paper. Cationic starch is added as sizing agent to increase the dry strength of the paper.
  • Nanomedicine
  • High temperature binders
  • Investment casting – used in moulds
  • An abrasive – for polishing silicon wafers
  • Carbonless paper
  • Catalysts
  • Moisture Absorbent
  • It increases the bulk & tapped density of powders and granules
  • It is used as a free-flow agent to assist powder flow, e.g. in tabletting, by reducing the angle of repose of bulk powder.
  • Stabilizing and rigidizing refractory ceramic fiber (fiberfrax) blankets
  • Abrasion-resistant coatings
  • Increasing friction – used to coat waxed floors, textile fibers and railway tracks to promote traction
  • Antisoiling – fills micropores to prevent take up of dirt and other particles into textiles
  • Surfactant – used for flocculating, coagulating, dispersing, stabilizing etc.
  • Liquid silicon dioxide (colloidal silica) is used as a wine and juice fining agent.
  • Absorbent
  • Colloidal silica is used in concrete densifiers and polished concrete.
  • In manufacturing Quantum dots, small semi-conductors used in various scientific research settings
  • used as an ingredient in many "Ceramic Coatings"
5. Caution
  • 1) Caution for handling Colloidal Silica.

    · Clean skin thoroughly with water when it's exposed to Colloidal Silica.

    · When an eye is exposed to Colloidal Silica, wash your face with clean water and apply aboric acid solution to the eye and use eye-drops. - Keep it away from wound.

    · Wash clothes contaminated by Colloidal Silica solution as soon as possible before it becomes dry. because it may cause decoloration and it's hard to remove it once it's dry.