Hydrofluorosilicic Acid 23% ACS

Product Overview

Hydrofluorosilicic Acid 23% ACS is a colorless, odorless liquid formulated for high-purity applications requiring strict analytical conformity. The solution denotes H₂SiF₆ in ACS Grade, designed for precise dosing in water treatment and as a versatile precursor in fluorine chemistry. Typical assay ranges from 22.5% to 23.5% w/w, with a target of 23%, as determined by titration with standardized NaOH. The product is produced to meet ACS reagent grade criteria and USP-NF monograph expectations, ensuring consistent composition, low impurity burden, and reliable performance across critical industrial processes.

With a density near 1.204 g/mL at 20°C and a color specification near APHA 6–10 (typical ~6), this liquid offers predictable handling characteristics and compatibility with HDPE or glass storage containers. The low residue after ignition (typical 0.02%, max 0.05%) supports applications demanding high purity, while the product’s color and purity profile support analytical and pharmaceutical-grade workflows where visual and chemical purity are essential.

Key Properties

• Property Name: Hydrofluorosilicic Acid (23% ACS)
• Chemical Formula: H₂SiF₆
• Molecular Weight: 125.98 g/mol
• Boiling Point: N/A
• Specific Gravity: 1.198–1.210 at 20°C (typical 1.204)
• Color (APHA): 6 (typical), max 10
• Residue After Ignition: 0.02% (typical), max 0.05%
• Chloride (Cl⁻): 800 ppm typical, max 2000 ppm
• Nitrate (NO₃⁻): 200 ppm typical, max 500 ppm
• Ammonium (NH₄⁺): 20 ppm typical, max 100 ppm
• Sulfate (SO₄²⁻): 300 ppm typical, max 1000 ppm
• Phosphate (PO₄³⁻): 25 ppm typical, max 100 ppm
• Arsenic (As): 0.005 ppm typical, max 0.01 ppm
• Heavy Metals (as Pb): 0.02 ppm typical, max 0.1 ppm
• Iron (Fe): 0.05 ppm typical, max 0.2 ppm
• Copper (Cu): 0.05 ppm typical, max 0.2 ppm
• Manganese (Mn): 0.1 ppm typical, max 0.5 ppm
• Nickel (Ni): 0.1 ppm typical, max 0.5 ppm
• Lead (Pb): 0.05 ppm typical, max 0.2 ppm
• Zinc (Zn): 0.2 ppm typical, max 1 ppm
• Aluminum (Al): 0.2 ppm typical, max 1 ppm
• Chromium (Cr): 0.1 ppm typical, max 0.5 ppm
• Cobalt (Co): 0.1 ppm typical, max 0.5 ppm
• Calcium (Ca): 50 ppm typical, max 200 ppm
• Magnesium (Mg): 50 ppm typical, max 200 ppm
• Sodium (Na): 150 ppm typical, max 500 ppm
• Potassium (K): 30 ppm typical, max 100 ppm
• Substances Reducing Permanganate: Passes test
• Sulfurous Acid (H₂SO₃): 20 ppm typical, max 50 ppm
• Laboratory Notes: Density 1.200 g/mL; Viscosity 1.2 cP (25°C); Refractive Index ~1.385 at 20°C

Common Applications

• Water Fluoridation: Used to add fluoride to drinking water for dental caries prevention with controlled fluoride delivery in municipal treatment facilities.
• Chemical Synthesis: Serves as a fluorinating precursor for synthesis of fluorine-containing organics and specialty fluorochemicals.
• pH Adjustment: Employed to adjust and stabilize pH in water treatment and industrial processes where fluoride buffering is required.
• Electroplating: Applied in plating baths to influence coating properties and corrosion resistance in metal finishing.
• Laboratory Reagent: Used as a reagent in analytical procedures, calibrations, and derivatization steps requiring fluoride sources.

Safety Precautions

Storage and handling should follow stringent chemical hygiene practices. Store in a cool, dry place away from incompatible materials, using containers made of HDPE or glass to minimize reactivity and leakage risk. Maintain ventilation in storage areas and equip handling zones with PPE suitable for strong corrosives (chemical-resistant gloves, splash goggles, and protective clothing). Protect product from light and moisture to preserve integrity; monitor containers for leaks or container degradation.

In case of exposure, the SDS indicates a DANGER classification: Skin Corr. 1A, Eye Dam. 1, and Acute Tox. 4. Immediate actions include flushing eyes with water for several minutes, removing contaminated clothing, washing skin, and seeking medical attention for any exposure. For ingestion, rinse mouth and do not induce vomiting; contact medical professionals promptly. Transportation follows UN 1760, Corrosive liquid, n.o.s., Class 8, Packing Group II. Emergency procedures should align with local regulations and SDS guidance.

Benefits

✔ High Purity ACS Grade – Consistent composition and low impurity levels suitable for analytical and pharmaceutical-grade workflows.
✔ Precise TDS Specifications – Verified by multi-parameter testing (assay, conductivity-related metrics, and trace metal limits) to ensure batch-to-batch reliability.