Fumed Silica (Silicon Dioxide, CAS No. 112945-52-5) is an ultra-fine, high-purity amorphous silica powder widely used as a thickening, anti-caking, rheology-modifying, and reinforcing agent. It improves flow properties, enhances suspension stability, prevents settling, and increases viscosity in coatings, adhesives, sealants, inks, cosmetics, pharmaceuticals, and chemical formulations.
| CAS Number | 20243-18-9 |
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| IUPAC Name | dioxosilane |
| Molecular Formula | O2Si |
| Molecular Weight | 60.084 |
| Grade | Industrial Grade |
| Purity | As per supplier specification |
| Synonyms | SILICON DIOXIDE, Silica, Dioxosilane, Silicic anhydride, Diatomaceous silica, Wessalon |
| Appearance | Transparent to gray, odorless powder. Irritating to the skin and eyes on contact. Inhalation will cause irritation in the respiratory tract |
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| Odor | Odorless |
| Density | 2.2 (NIOSH, 2024) - Denser than water |
| Melting Point | 3110 °F (NIOSH, 2024) |
| Boiling Point | 4046 °F at 760 mmHg (NIOSH, 2024) |
| Solubility | Insoluble (NIOSH, 2024) |
| Storage Conditions | Store in a cool, dry, well-ventilated area in tightly closed containers. |
| Hazard Statements | Not Classified Reported as not meeting GHS hazard criteria by 7724 of 9127 companies H315: Causes skin irritation H319: Causes serious eye irritation |
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| Regulatory References | GHS Labeling, SDS documentation, OSHA HazCom, and REACH where applicable. |
| Key Uses | Industrial processing, laboratory support, formulation systems, and manufacturing operations. |
| Price Valid Until | 2026-08-18 |
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