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Name: Hexafluorosilicic acid CAS#16961-83-4
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Hexafluorosilicic acid CAS#16961-83-4

Basic Information

Wide Industrial Applicability：Suitable for use across water treatment, chemical manufacturing, metallurgy, and organic synthesis, offering broad application versatility.

Key Raw Material for Fluoride Compounds：An essential precursor for the production of aluminum fluoride, cryolite, and various hexafluorosilicate salts, supporting stable downstream manufacturing.

Functional Performance in Metallurgy：Effectively used as an electrolyte in the Betts electrolytic process, contributing to efficient and reliable lead refining operations.

High Reactivity in Chemical Synthesis：Acts as a specialized reagent for selective Si–O bond cleavage in silyl ethers, enabling precise control in organic synthesis processes.

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product description

Product Description of Hexafluorosilicic acid CAS#16961-83-4

Hexafluorosilicic acid is an inorganic acid with broad industrial applications. It is mainly used in water fluoridation to reduce dental caries incidence. It serves as a key raw material for manufacturing aluminum fluoride, cryolite and various hexafluorosilicate salts, and is also applied in the production of silicon and silicon dioxide. It acts as an electrolyte in the Betts electrolytic process for lead refining. In organic synthesis, it is used as a special reagent for the selective cleavage of Si–O bonds in silyl ethers.

Product Application of Hexafluorosilicic acid CAS#16961-83-4

Hexafluorosilicic acid is widely used as a fluoride source and can be processed into various high-value hexafluorosilicate salts. It acts as an electrolyte in the Betts electrolytic process for lead refining. In organic chemistry, it serves as a key reagent for cleaving Si–O bonds in silyl ethers. Furthermore, it is applied as a wood preservative and for surface modification of calcium carbonate.

Product Information

Parameters

Boiling point	108-109°C
density	1.22 g/mL at 20 °C (lit.) 1.31 g/mL at 25 °C
vapor pressure	23hPa at 19.85℃
refractive index	1.35
Fp	108-109°C
storage temp.	−20°C
solubility	H2O: 1 mg/mL, clear, colorless
form	Liquid
pka	1.83[at 20 ℃]
color	Clear colorless
Specific Gravity	1.38 (40%)
Water Solubility	Miscible with water.
Hydrolytic Sensitivity	0: forms stable aqueous solutions
Merck	144,182
Exposure limits	ACGIH: TWA 2.5 mg/m3
Exposure limits	NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3
Stability:	Stable in aqueous solution.
InChI	1S/F4Si.2FH/c1-5(2,3)4;;/h;2*1H
InChIKey	AUJBMDCSBIPDEH-UHFFFAOYSA-N
SMILES	F.F.F[Si](F)(F)F
CAS DataBase Reference	16961-83-4(CAS DataBase Reference)
EPA Substance Registry System	Fluosilicic acid (16961-83-4)

Safety Information

Hazard Codes	C
Risk Statements	34-35-20/21/22
Safety Statements	26-36/37/39-45-27
RIDADR	UN 1778 8/PG 2
WGK Germany	3
RTECS	VV8225000
F	8月10日
Hazard Note	Corrosive
TSCA	TSCA listed
HazardClass	8
PackingGroup	II
HS Code	28111990
Storage Class	6.1D - Non-combustible acute toxic Cat.3
Storage Class	toxic hazardous materials or hazardous materials causing chronic effects
Hazard Classifications	Acute Tox. 3 Dermal
	Acute Tox. 4 Oral
	Eye Dam. 1
	Skin Corr. 1
Hazardous Substances Data	16961-83-4(Hazardous Substances Data)
Toxicity	LD50 oral in rat: 430mg/kg

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