Fumed Silica (also known as Pyrogenic Silica) is a synthetic, amorphous silicon dioxide with extremely small particle size and large surface area. It is produced by hydrolyzing silicon tetrachloride (SiCl₄) in a high-temperature flame, resulting in highly pure, fluffy white powder.
Core Properties:
- Ultra-fine primary particle size (7–40 nm)
- High surface area (BET: 200–400 m²/g)
- Excellent thickening, anti-settling, and free-flow effects
- Hydrophilic and hydrophobic grades available
Production & Technical Highlights
Production Method: Flame hydrolysis of silicon tetrachloride (SiCl₄) at ~1100°C:
SiCl₄ + 2H₂ + O₂ → SiO₂ + 4HCl
Result: Extremely pure silica particles in chain-like aggregate form, offering unmatched control over viscosity and thixotropy.
Key Characteristics
| Svojstvo | Range / Opis |
|---|---|
| Izgled | Bijela, fluffy powder |
| Surface Area (BET) | 200–400 m²/g |
| Primary Particle Size | 7–40 nm |
| Nasipna gustoća | ~30–60 g/L |
| pH (4% in water) | 3.5–5.5 |
| vlaga | < 1.5% |
| Dostupne ocjene | Hydrophilic / Hydrophobic |
Applications by Industry
🛢 Industrial Coatings & Sealants
- Anti-settling additive for pigment systems
- Rheology modifier in adhesives and sealants
- Improves sag resistance and storage stability
📄 Paper Chemicals
- Enhances ink retention and print sharpness
- Used in paper coatings for surface smoothness
- Improves oil/grease barrier in specialty paper
🛞 Rubber & Elastomers
- Reinforcement agent in silicone rubber
- Anti-caking & free-flow in powdered elastomer systems
- Improves mechanical strength and dispersion
KosNature Product Grades
| Razred | Tip | Surface Area | Key Use |
| FS-200 | Hydrophilic | 200 m²/g | General industrial use |
| FS-300 | Hydrophilic | 300 m²/g | Sealants & paper coatings |
| FS-250H | Hydrophobic | 250 m²/g | Non-polar systems, rubber mixing |
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