Fluorosilicic Acid (CAS 16961-83-4) is a colorless, corrosive inorganic acid formed as a byproduct of phosphate fertilizer production and supplied as a clear aqueous solution; it acts as a strong fluorinating agent in water fluoridation, metal surface treatment, and aluminum fluoride production. It is a strong fluorinating agent with industrial and municipal applications.
Typical Properties
| Molecular formula | F6Si.2H |
|---|---|
| Molecular weight | 144.09 g/mol |
| Appearance | colourless liquid; often supplied as a colourless solution in water |
| Form | Liquid |
| Color | Clear colorless |
| Boiling point | 115.4 °C |
| Density | 1.22 g/mL at 25 °C |
| Water solubility | Miscible with water. |
| Flash point | 108-109°C |
| GHS signal word | Danger · Corrosive, Acute toxicity, Irritant / harmful, Health hazard |
| HS code | 28111990 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Fluorosilicic Acid
Applications
Used in water fluoridation, metal surface treatment, and aluminum fluoride production. Also applied in ceramic glazing and etching formulations.
Safety & Risks
Highly corrosive and toxic by ingestion or inhalation. Use acid-resistant PPE and local ventilation.
Packaging
Supplied in 25–35 kg PE drums or 1,000 L IBC tanks. Store in acid-resistant containers away from bases.