Silica hydrate
CAS: 10279-57-9
Category: Organosilicon Compounds
| Purity | Industrial Grade ≥95%; Rubber Grade ≥98%; Food/Pharmaceutical Grade ≥99% |
| Molecular Formula | SiO2·nH2O |
| Molecular Weight | Approximately 60.08 + bound water (variable) |
| Appearance | White amorphous powder or hydrated silica gel; odorless; fine particles with high surface area and strong moisture adsorption capacity |
| Packaging | 10 kg, 20 kg, or 25 kg kraft paper bags with polyethylene inner liner; 500 kg or 1000 kg moisture-proof jumbo bags |
| Testing Indicators | Appearance — Visual inspection; Moisture content — Loss on drying (105°C drying method, ASTM D280); Silica content (SiO2) — Gravimetric analysis; Particle size distribution — Laser diffraction analysis; Specific surface area — BET nitrogen adsorption method (ASTM D3663); pH value — pH measurement of aqueous suspension; Heavy metals — ICP-OES/ICP-MS analysis; Identification — FTIR spectroscopy (Si–O–Si characteristic absorption). |
| Storage Notes | Store in a cool, dry, and well-ventilated warehouse. Keep containers tightly sealed and protected from moisture absorption. Avoid contact with strong alkalis, hydrofluoric acid, and incompatible chemicals. Prevent contamination during storage and handling. |
| Lead Time | 10 days |
Used as a functional silica material in rubber reinforcement, coatings, adhesives, sealants, pharmaceuticals, cosmetics, food additives, chromatography materials, desiccants, and catalyst supports. Hydrated silica is valued for its adsorption capacity, thickening ability, and reinforcing properties.