High purity industrial chemical grade fumed silica with CAS 11294552 delivers highly controlled particle size and surface characteristics for demanding applications. This material functions as a reinforcing filler, anti-caking agent, and viscosity stabilizer across coatings, adhesives, sealants, and elastomers.
Manufactured through flame hydrolysis of silicon tetrachloride, the resulting amorphous silica offers exceptional specific surface area and purity, meeting strict regulatory and process requirements for advanced formulations. The following sections detail specifications, performance factors, handling considerations, and common user inquiries.
| Property | High Purity Grade | Typical Testing Method | Key Impact |
|---|---|---|---|
| CAS Number | 112945-52-0 | Supplier Certificate | Regulatory identification and traceability |
| Specific Surface Area | 100–200 m²/g | BET Nitrogen adsorption | Controls rheology and reinforcement |
| Purity (SiO₂) | ≥99.8% | Gravimetric/TGA | Reduces impurities that affect durability |
| Moisture Content | ≤1.0% | Loss on drying at 105°C | Infences dispersion and processing |
| pH (Suspension) | 3.0–5.0 | Aqueous slurry measurement | Impacts compatibility with polar systems |
Processing performance and surface treatment
Influence of surface modification on dispersion
High purity industrial chemical grade fumed silica often undergoes tailored surface treatment to improve compatibility with organic resins and polymers. Hydrophobic grades facilitate incorporation into nonpolar matrices, reducing viscosity spikes and enhancing filler dispersion. Optimized surface energy balances touch, sag, and leveling behavior during application.
Reinforcement and thixotropy control
At low loadings, this fumed silica efficiently thickens formulations and prevents sedimentation, contributing to stable storage and application. It reinforces elastomers and sealants, improving tear strength and dimensional retention under varying temperatures. Consistent particle structure supports reproducible rheology across batches.
Quality, compliance, and handling considerations
Meeting regulatory and purity standards
Producers implement tight process control to limit trace metals and residual chlorides, making CAS 11294552 suitable for sensitive formulations. Conformance to REACH and other regional regulations supports use in coatings, adhesives, and consumer applications where low contamination is critical.
Safe handling and storage practices
Dust control, proper ventilation, and personal protective equipment reduce inhalation and exposure risks. Storage in sealed containers under dry conditions preserves free-flow properties and prevents unintended agglomeration that could affect dosing accuracy.
Formulation design and optimization
Balancing rheology with mechanical properties
Formulators can adjust silica content to tune viscosity, sag resistance, and build film strength without sacrificing flexibility. Compatibility testing with resins, solvents, and curing systems ensures optimal integration into the final matrix.
Practical implementation and recommendations
- Verify surface treatment compatibility with the resin matrix to maximize dispersion and minimize viscosity penalties.
- Start at low loadings and incrementally adjust to balance rheology, mechanical strength, and processing ease.
- Implement dust suppression and local ventilation during handling to maintain workplace air quality.
- Monitor lot-specific data such as specific surface area and pH to ensure consistent performance across production batches.
FAQ
Reader questions
Is high purity fumed silica CAS 11294552 suitable for UV-curable coatings?
Yes, its high purity and controlled surface treatment enable incorporation into UV-curable systems to improve viscosity and scratch resistance while maintaining clarity and cure speed.
How does this material affect mechanical properties in silicone sealants?
It reinforces the elastomeric network, enhancing tear strength, modulus, and temperature resistance, which improves durability in demanding jointing and glazing applications.
Can this grade of fumed silica help reduce settling in heavy architectural coatings?
Absolutely, its fine structure and high surface area provide thixotropic behavior that suspends pigments and fillers, minimizing settling and enabling stable storage.
What precautions should be taken when compounding it into thermoplastic polymers?
Use adequate dispersion equipment, control moisture, and optimize mixing sequences to prevent agglomeration, ensuring uniform reinforcement and consistent processability.