- Sự miêu tả
- Yêu cầu
Fumed Silica (also known as Pyrogenic Silica) là một 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
Kết quả: Extremely pure silica particles in chain-like aggregate form, offering unmatched control over viscosity and thixotropy.
Key Characteristics
| Tài sản | Range / Sự miêu tả |
|---|---|
| Bề ngoài | Trắng, fluffy powder |
| Surface Area (BET) | 200–400 m²/g |
| Primary Particle Size | 7–40 nm |
| Bulk Density | ~30–60 g/L |
| độ pH (4% in water) | 3.5–5.5 |
| độ ẩm | < 1.5% |
| Grades Available | 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
| Lớp | Kiểu | 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 |
Explore other Cosmetic Formulation Ingredients
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