Hexafluorosilicic Acid CAS 16961-83-4

Fluorosilicic acid, also known as hydrofluorosilicic acid. The anhydrous form is a colourless gas. It is unstable and readily decomposes into silicon tetrafluoride and hydrogen fluoride. Its aqueous solution is colourless and exhibits strongly acidic properties. It is corrosive and can etch glass. It should be stored in containers made of wax or plastic.

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Model:
16961-83-4
Brand:
Futurechemical
Code:
16961-83-4

Product Description

Product Name:	Hexafluorosilicic acid
CAS:	16961-83-4
MF:	F6H2Si
MW:	144.09
EINECS:	241-034-8
Product Categories:	Fluoride;peptide;Acids;Electronic Chemicals;Micro/Nanoelectronics;Inorganics
Mol File:	16961-83-4.mol
Hexafluorosilicic acid Chemical Properties
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
pka	1.83[at 20 ℃]
form	Liquid
Specific Gravity	1.38 (40%)
color	Clear colorless
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.
InChIKey	AUJBMDCSBIPDEH-UHFFFAOYSA-N
CAS DataBase Reference	16961-83-4(CAS DataBase Reference)
EPA Substance Registry System	Fluosilicic acid (16961-83-4)

Items		Unit	Specification	Results
Content [H2SiF6]		%≥	23.00	23.5
Free Acid	[HF]	%≤	0.300	0.09
Sulfuric	[SO4]	%≤	0.300	0.210
Arsenic	[As]	%≤	0.002	0.0001
Copper	[Cu]	%≤	0.002	0.0001
Iron	[Fe]	%≤	0.01	0.002
Lead	[Pb]	%≤	0.002	0.0002
Mercury	[Hg]	%≤	0.002	0.0001

Hexafluorosilicic acid CAS 16961-83-4 Industrial Glass Etching Agent Metal surface treatment agent Wood preservative Active Ingredient for Agricultural Insecticides Fluoride Precipitator for Industrial Wastewater

Quality Assurance

Full-Process Quality Control: From incoming raw material inspection to in-process monitoring and final outgoing checks, every batch is inspected at each production stage against strict acceptance standards.
Third-Party Certified & Tested: Our quality management system is certified to ISO 9001, and products are regularly tested by accredited laboratories (e.g. SGS, TÜV). Test reports are available on request.
100% Batch Traceability: Each batch carries a unique lot number that links raw material records, production parameters, and test results, enabling complete traceability from factory to final delivery.
Pre-Shipment Inspection: Every order passes a final pre-shipment inspection, with inspection photos and reports shared before dispatch.

FAQ From Customers

Q1: What is the minimum order quantity?

A: There is no quantity limit for the first sample or trial order. Just tell us the actual quantity you need.
Q2: How can I confirm that the quality meets the requirements?

A: Provide your specifications, and our technical team will check them or customize them for you; we can provide TDS, MSDS, and COA, and accept third-party testing.
Q3: How do you ensure stable quality?

A: We manufacture under an ISO 9001 quality system, test every batch before release, and retain samples for 24 months for traceability.
Q4: Do you provide samples?

A: Yes — Free samples are available; freight is at buyer's expense for express delivery.