Precipitated Silica Filler (Paper Grade)
CAS Number: 7631-86-9
Precipitated silica (fine particle amorphous silica) is used in paper manufacturing as a functional filler to improve opacity, printability, and ink absorbency. Its high surface area and porous structure enhance ink drying speed and color density on uncoated and coated paper grades. It is particularly valued in inkjet, thermal, and carbonless paper applications.
Technical Specifications
| appearance | White fine powder |
| pH (5% slurry) | 6.0–8.0 |
| moisture content (%) | ≤ 6 |
| BET surface area (m²/g) | 100–300 |
| average particle size (μm) | 3–15 |
Applications
- Functional filler in inkjet and specialty printing papers
- Opacity and brightness enhancer in fine paper
- Thermal paper top-coat for heat sensitivity
- Carbonless (NCR) paper coating component
- Anti-slip agent in packaging papers and boards
Key Features
- High surface area improves ink absorption and color development
- Porous structure ensures rapid ink drying and good resolution
- Improves sheet opacity without heavy basis weight increase
- Available in multiple grades for different paper applications
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