Hydrofluorosilicic Acid 23% ACS

Product Overview

Hydrofluorosilicic Acid 23% ACS is a high-purity, colorless liquid solution comprised of Hexafluorosilicic Acid (H₂SiF₆). Manufactured to meet American Chemical Society (ACS) reagent grade standards, this 23% concentration ensures consistent stoichiometry and minimal trace metal impurities. It is extensively used in municipal water treatment for fluoridation, as well as in electrolytic refining and chemical synthesis.

This solution features a density of approximately 1.204 g/mL at 20°C with a typical color specification of APHA 6, indicating exceptional clarity. The production process strictly controls heavy metals and residue after ignition (typical 0.02%), making it suitable for sensitive analytical workflows, pharmaceutical precursors, and specialized metal finishing processes where contamination must be minimized.

Key Specifications

• Chemical Name: Hydrofluorosilicic Acid (Hexafluorosilicic Acid)
• Concentration: 23% w/w (22.5% – 23.5% range)
• Grade: ACS Reagent Grade
• CAS Number: 16961-83-4
• Formula: H₂SiF₆
• Specific Gravity: 1.204 (typical) at 20°C
• Heavy Metals (as Pb): Max 0.1 ppm
• Appearance: Clear, colorless liquid

Common Applications

• Municipal Water Treatment: The primary source for adjusting fluoride levels in drinking water systems due to its solubility and precise dosing capabilities.
• Metal Surface Treatment: Used in electroplating baths and metal cleaning to prepare surfaces and enhance corrosion resistance.
• Chemical Synthesis: Serves as a vital precursor in the production of aluminum fluoride, cryolite, and other organic fluorine compounds.
• Laboratory Reagent: Utilized in analytical chemistry for separations and as a titration agent requiring high-purity inputs.
• Ceramics & Glass: Employed in the hardening of ceramics and etching processes.

Safety & Handling

Hydrofluorosilicic Acid is a corrosive liquid (Class 8) and requires strict adherence to safety protocols. Personnel must wear acid-resistant personal protective equipment (PPE), including gloves, goggles, and face shields. Store in HDPE or lined steel containers in a cool, well-ventilated area, away from strong bases and glass (unless specifically designed for fluorides).

Shipping Information: UN 1760, Corrosive liquid, n.o.s. (Hydrofluorosilicic Acid), Class 8, PG II.

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