Hydrofluorosilicic Acid 23% ACS

Name: Hydrofluorosilicic Acid 23% ACS
Brand: Alliance Chemical
SKU: HC6-6N8-T3C
Availability: InStock

Who Buys This

Water treatment facilities
Municipal water systems
Chemical manufacturers
Electroplating companies
Analytical laboratories

Grade Guide

ACS Grade certified purity
Laboratory analytical procedures
Industrial chemical synthesis
Water fluoridation applications

Pack Sizes

1 Quart: lab & small jobs
1 Gallon: shop & maintenance
5 Gallon: production & regular use
15 Gallon: mid-volume operations
55 Gallon: bulk drum
275 Gallon: high-volume tote
330 Gallon: max-volume tote

Docs Included

UN 1778 Class 8 packaging
Safety Data Sheet included
Certificate of Analysis provided
ACS specification compliance

Description
Product Documents
Chemical Profile

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.

Related Products

Property	Value
Molecular Weight	144.08 g/mol
Formula	H2SiF6
Assay	23%
Grade	ACS
Form	Liquid
Solubility	Miscible with water
Appearance	Clear, colorless liquid
Melting Point	-37 °C
Boiling Point	108 °C
Specific Gravity	1.12
Industry	Industrial, Environmental, Wastewater

Frequently Asked Questions About Hydrofluorosilicic Acid 23% ACS

What is Hydrofluorosilicic Acid 23% ACS and what is its chemical formula?

Hydrofluorosilicic Acid 23% ACS is a chemical compound with the molecular formula H2SiF6, registered under CAS Number 16961-83-4 by the Chemical Abstracts Service (PubChem), with a molecular weight of 144.08 g/mol. Alliance Chemical supplies Hydrofluorosilicic Acid 23% ACS in ACS grade for laboratory, industrial, and commercial applications.

What are the physical properties of Hydrofluorosilicic Acid 23% ACS?

According to the NIOSH Pocket Guide to Chemical Hazards, Hydrofluorosilicic Acid 23% ACS is supplied as a clear, colorless liquid. It has a melting point of -37°C, a boiling point of 108°C. The specific gravity is 1.12 relative to water. Solubility: Miscible with water.

What grade and purity of Hydrofluorosilicic Acid 23% ACS does Alliance Chemical offer?

Alliance Chemical offers Hydrofluorosilicic Acid 23% ACS in ACS grade with a purity assay of 23%. Every lot ships with a Certificate of Analysis (COA) and Safety Data Sheet (SDS) prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and GHS Revision 7. Download SDS.

What are common industrial applications of Hydrofluorosilicic Acid 23% ACS?

Hydrofluorosilicic Acid 23% ACS serves a wide range of sectors, including Industrial, Environmental, and Wastewater.Alliance Chemical provides the documentation and quality certifications required for use in regulated environments.

What PPE is required when handling Hydrofluorosilicic Acid 23% ACS?

OSHA-mandated PPE per 29 CFR 1910.132-138:Chemical-resistant gloves (20+ mil neoprene or PVC), full face shield over safety goggles (ANSI Z87.1), acid-resistant apron or chemical suit, closed-toe chemical-resistant footwear. Emergency eyewash station and safety shower must be accessible within 10 seconds per ANSI Z358.1. Consult the SDS available from Alliance Chemical for complete PPE requirements.

What are the storage requirements for Hydrofluorosilicic Acid 23% ACS?

Store perOSHA 29 CFR 1910.1450: Dedicated corrosives cabinet with secondary containment (110% volume per EPA 40 CFR 264.175). Temperature range:15-25°C. Segregate from:bases, reactive metals, organic materials. Maximum storage:2-3 years unopened.

What is the emergency spill procedure for Hydrofluorosilicic Acid 23% ACS?

Emergency response per EPA SPCC (40 CFR 112) and OSHA 29 CFR 1910.120: (1) Alert personnel, evacuate area to 50 feet. (2) Eliminate ignition sources if flammable. (3) Don PPE per SDS Section 8. (4) Stop leak if safe; use emergency shutoffs. (5) Contain with non-combustible absorbent materials, dike with sand/earth. (6)Carefully neutralize with sodium bicarbonate (5-10% solution), monitor exothermic reaction. (7) Collect in DOT-approved containers, label as hazardous waste. Check 40 CFR 302.4 for Reportable Quantity. Emergency: Chemtel 1-800-255-3924 (24/7). Non-emergency: Alliance Chemical 512-365-6838.

What is the DOT shipping classification for Hydrofluorosilicic Acid 23% ACS?

DOT Classification per 49 CFR 172.101:See SDS Section 14 for specific UN number, Hazard Class8 (Corrosive), Packing GroupII/III. Requires: Hazmat shipping papers (49 CFR 172.200), UN specification packaging (49 CFR 173), hazmat labels (172.400). Alliance Chemical ships all orders in DOT-compliant packaging with proper documentation.

How must Hydrofluorosilicic Acid 23% ACS waste be disposed?

Disposal per RCRA (40 CFR 261-265):Characteristic waste D002 (Corrosive, pH ≤2 or ≥12.5). Generator requirements: EPA ID number required if >100 kg/month (40 CFR 262.12). Use EPA-permitted Treatment, Storage, Disposal Facility (TSDF). Never discharge to sewer without POTW written approval (40 CFR 403). Container disposal: Triple rinse (40 CFR 261.7), offer for reconditioning/recycling. State regulations may be more stringent — check with your local environmental agency. Consult the Alliance Chemical SDS for product-specific disposal guidance.

Does Alliance Chemical provide an SDS and COA for Hydrofluorosilicic Acid 23% ACS?

Yes. Alliance Chemical provides a Safety Data Sheet (SDS) and Certificate of Analysis (COA) for every lot of Hydrofluorosilicic Acid 23% ACS. The SDS is prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and the Globally Harmonized System (GHS) Revision 7, covering all 16 required sections including hazard identification, first aid measures, firefighting measures, handling and storage, exposure controls, and regulatory information. The SDS is available for download directly from this product page. COAs are available upon request by contacting Alliance Chemical at 512-365-6838.