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Product Name: Sodium Fluorosilicate
Common Synonyms: Fluorosilicic acid disodium salt, Disodium hexafluorosilicate
Chemical Formula: Na2SiF6
CAS Number: 16893-85-9
Recommended Use: Commonly used as a water fluoridation agent, in ceramics, in glass production, and as a chemical intermediate.
Manufacturer: Refer to the product supplier for details.
Emergency Contact Information: Available from the supplier’s 24-hour emergency hotline.
Hazard Classification: Acute toxicity (oral, inhalation), Eye irritation, Skin irritation, Environmental hazard
Signal Word: Danger
Hazard Statements: Harmful if swallowed, inhaled, or in contact with skin; causes serious eye and skin irritation; toxic to aquatic life.
Precautionary Statements: Avoid inhalation of dust; prevent skin and eye contact; wash hands thoroughly after handling.
GHS Pictograms: Skull and crossbones, exclamation mark, health hazard, environment
Chemical Name: Sodium Fluorosilicate
Concentration: 98-100%
Impurities: May contain trace moisture and other trace inorganic fluorides.
Component CAS Number: 16893-85-9
Inhalation: Move the affected person into fresh air. Provide oxygen if breathing is difficult, seek medical attention immediately.
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with water for at least fifteen minutes. In case of irritation, contact medical personnel.
Eye Contact: Flush eyes with plenty of water for at least fifteen minutes, lifting upper and lower lids. Get medical attention as soon as possible.
Ingestion: Rinse mouth with water. Do not induce vomiting, seek immediate medical help.
Notes for Physicians: Treat symptomatically; watch for delayed pulmonary complications. Monitor for hypocalcemia and hyperkalemia.
Suitable Extinguishing Media: Use water spray, dry chemical, carbon dioxide, or foam. Avoid direct water stream on substance if it can scatter powder.
Hazardous Combustion Products: Hydrogen fluoride, silicon tetrafluoride, sodium oxides
Firefighting Instructions: Wear self-contained breathing apparatus and full protective gear to prevent contact with skin and eyes. Stay upwind to avoid hazardous vapors.
Explosion Hazards: No significant risk of explosion, but intense heating can produce toxic vapors.
Personal Precautions: Evacuate personnel to safe areas, utilize appropriate personal protective equipment including gloves, goggles, and a dust respirator.
Environmental Precautions: Prevent entry into drains, watercourses, and soil. Notify local environmental authorities as required.
Cleanup Methods: Sweep up using tools that minimize dust generation, place in suitable dry, closed containers for disposal. Clean area with water though avoid contamination of waterways.
Handling: Always handle in a well-ventilated area and minimize dust formation; avoid contact with skin, eyes, and clothing. Never eat, drink, or smoke in areas where this chemical is used or stored. Wash hands and face after work.
Storage: Store in tightly closed, corrosion-resistant containers away from sources of moisture and incompatible materials such as strong acids or alkalis. Keep storage area cool, dry, and well-ventilated. Post hazard signage in storage area and restrict access to authorized personnel only.
Occupational Exposure Limits: ACGIH TLV: 2.5 mg/m³ (as fluoride, dust)
Engineering Controls: Provide adequate ventilation, process enclosure, local exhaust, and general exhaust to limit airborne exposure.
Personal Protection: Wear chemical-resistant gloves (such as nitrile or neoprene), safety goggles, face shield, and protective clothing. Use a properly fitted NIOSH-approved respirator when airborne exposure standards may be exceeded.
Hygiene: Eye wash and safety showers should be installed in the immediate area.
Appearance: White, odorless, crystalline powder
Molecular Weight: 188.06 g/mol
Solubility in Water: 1.22 g/100 ml (20°C)
Melting Point: 500°C (decomposes)
pH: Weakly acidic to neutral in solution
Density: 2.68 g/cm³
Vapor Pressure: Negligible
Other Physical Properties: Non-flammable, does not self-ignite, stable under recommended conditions
Chemical Stability: Stable under normal storage and use conditions.
Possibility of Hazardous Reactions: Reacts with acids to form toxic hydrogen fluoride gas.
Conditions to Avoid: Exposure to moisture and humidity, contact with incompatible materials.
Incompatible Materials: Strong acids, strong oxidizers, water sources that can produce gas.
Hazardous Decomposition Products: Hydrogen fluoride, silicon tetrafluoride, sodium oxides.
Acute Toxicity: Oral LD50 (rat): 430 mg/kg; inhalation and dermal toxicity are both significant; likely harmful in humans at lower doses.
Routes of Exposure: Inhalation, ingestion, skin, and eye contact.
Health Effects: Eye contact causes painful irritation and possible burns; skin contact leads to irritation, redness, and possible chemical burns; ingestion causes severe irritation, abdominal cramps, nausea, vomiting, and potentially systemic toxicity which may be fatal due to hypocalcemia; inhalation of dust can cause nose, throat, and lung irritation.
Chronic Effects: Extended exposure may result in fluorosis: bone, joint, and kidney damage. Long-term contact or repeated exposure can damage teeth and bones and affect kidney function.
Aquatic Toxicity: Toxic to aquatic organisms; low concentrations can cause long-term adverse effects in the aquatic environment.
Bioaccumulation: Likely to accumulate in bones and teeth of aquatic life.
Persistence and Degradation: Remains persistent in environmental compartments, does not readily degrade.
Mobility in Soil: Readily migrates in soil and water; can affect plants and soil microorganisms.
Waste Treatment Methods: Treat as hazardous waste, never flush to drains or allow to contaminate public water systems. Collect and transfer to an approved chemical waste disposal facility.
Container Disposal: Empty containers retain hazard residues; follow local, regional, and national regulations for disposal.
Special Precautions: Avoid disposal practices that could result in fluoride or silica contamination of surface or ground water.
UN Number: 2674
UN Proper Shipping Name: Sodium fluorosilicate
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: III
Marine Pollutant: Yes
Special Transport Notes: Must be isolated from foods and feedstuffs; Proper labeling and documentation apply for international and local shipment.
OSHA: Regulated substance, hazardous by definition of the Hazard Communication Standard.
TSCA: Listed on the U.S. Toxic Substances Control Act Inventory.
EPA: Subject to specific reporting requirements under CERCLA.
SARA: SARA 313 and 302 listed.
EU Classification: T: Toxic; N: Dangerous for the environment.
Other Applicable Laws: Complies with EU REACH regulations if imported or manufactured above threshold quantities; additional restrictions may apply in selected jurisdictions.
Labeling Requirements: Product label must state hazards clearly, show hazard pictograms, and include warnings according to GHS and local authority guidelines.
