Nano-Silica
CAS Number: 7631-86-9
Nano-silica is a synthetic amorphous silicon dioxide with a primary particle size in the 5–40 nm range, offering an exceptionally high specific surface area. It is widely used as a rheology modifier, reinforcing agent, and anti-blocking additive in coatings, adhesives, sealants, and rubber compounds. The nanoscale particle size delivers superior transparency and performance compared to conventional fumed silica at equivalent dosages.
Technical Specifications
| pH | 3.5–4.5 (4% dispersion) |
| purity | SiO₂ ≥99.8% |
| appearance | White fluffy powder |
| BET surface area | 150–380 m²/g |
Applications
- Rheology control in waterborne coatings
- Reinforcing filler in silicone and rubber systems
- Anti-scratch and anti-blocking additive for films
- Thixotropic agent in adhesives and sealants
- Polishing slurries and CMP applications
Key Features
- Ultra-fine particle size (5–40 nm) for maximum reinforcing efficiency
- High purity with minimal metal ion contamination
- Surface-treated grades available for improved dispersibility
- Imparts thixotropy and sag resistance without yellowing