Fluosilicic Acid
A colourless to pale yellow transparent liquid with a pungent odour and strong corrosivity. The base raw material for sodium and potassium fluosilicate, aluminium fluoride and related salts.
Fluosilicic acid is recovered as a co-product of phosphate fertiliser production and an important fluorine resource carrier. ANFA supplies 30–45% product for fluosilicate synthesis, water fluoridation, concrete hardening and metal treatment, with configurable concentration, free HF and heavy metal limits.
International trade names: Ácido fluorosilícico (Spanish), Ácido fluorossilícico (Portuguese), Гексафторкремниевая кислота (Russian). Overseas buyers frequently search for this product under these local-language names.
Fluosilicic Acid — Typical Specification
| Item | Premium | Grade A | Grade B |
|---|---|---|---|
| H₂SiF₆ content | ≥ 40.0% | ≥ 35.0% | ≥ 30.0% |
| Free HF | ≤ 1.0% | ≤ 2.0% | ≤ 3.0% |
| Iron (Fe) | ≤ 0.02% | ≤ 0.05% | ≤ 0.10% |
| Heavy metals (as Pb) | ≤ 0.005% | ≤ 0.01% | ≤ 0.02% |
| Phosphate (as P₂O₅) | ≤ 0.05% | ≤ 0.10% | ≤ 0.20% |
| Density (20°C) | 1.32 g/cm³ | 1.28 g/cm³ | 1.24 g/cm³ |
Typical values, configurable on request
Safety & handling
Class 8 corrosive. Decomposes with alkalis to release HF and silica — do not store with alkaline materials.
More in our portfolio
Hydrofluoric Acid
An aqueous solution of hydrogen fluoride (HF). A colourless, fuming and highly corrosive liquid that attacks glass and siliceous materials. ANFA supplies the full 30–70% concentration range across industrial and electronic (UP / EL) grades, tailored to your process.
Learn moreAmmonium Bifluoride
White needle-like crystals, deliquescent and prone to caking; soluble in water, slightly soluble in alcohol. The aqueous solution is acidic and attacks glass. Decomposes into ammonia and hydrogen fluoride on heating.
Learn moreCalcium Fluoride (Fluorspar)
The originating raw material of the fluorine chemical industry. ANFA supplies acid-grade fluorspar concentrate (CaF₂ 85–97%) and metallurgical grade fluorspar for HF production, metallurgical fluxing and construction materials.
Learn moreNeed a fluorine solution built around your process?
Tell us your substrate, line configuration and cycle time — our technical team will respond with a formulation proposal and samples.