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Chemical Name: Ammonium Fluorosilicate
Common Names: Ammonium silicofluoride
Chemical Formula: (NH4)2SiF6
Appearance: White, crystalline powder that does not carry a noticeable odor
Uses: Water fluoridation, glass etching, ceramics, textile finishing, and disinfectant production
CAS Number: 16919-19-0
Hazard Classification: Toxic if inhaled or ingested, potential irritant for eyes, skin, and respiratory system
Main Hazards: Causes burns, can release toxic gases when mixed with acids, may cause damage to teeth and bones after prolonged exposure
Exposure Routes: Inhalation remains the most direct risk pathway, with ingestion and contact through skin as secondary routes
Short-term Effects: Irritation, coughing, nosebleeds, burns
Long-term Effects: Risk of fluorosis, kidney or nervous system issues if exposure occurs repeatedly over extended periods
Main Ingredient: Ammonium fluorosilicate (concentration above 98 percent in typical commercial samples)
Impurities: Small traces of ammonium salts, possible silica-based byproducts
Inhalation: Move victim to fresh air quickly, keep airway open, seek immediate medical help if breathing becomes difficult
Skin Contact: Remove contaminated clothing, wash area with large amounts of water, do not rub, and obtain medical attention if irritation occurs
Eye Contact: Rinse with water carefully for at least fifteen minutes, keep eyelids open, call for medical assistance at once
Ingestion: Do not induce vomiting, rinse mouth, drink plenty of water, consult a healthcare professional right away
Symptoms to Watch: Nausea, dizziness, burns, chest tightness, persistent discomfort should push someone to see a doctor without delay
Suitable Extinguishing Media: Water spray, dry chemical powder, carbon dioxide
Dangers from Fire: Exposes risk of harmful gas release including hydrogen fluoride and silicon tetrafluoride, especially in poorly ventilated fire scenarios
Fire Response Tactics: Evacuate, use protective respiratory gear, prevent run-off from entering sensitive waterways or drainage
Protective Equipment: Full-body chemical resistant gear, self-contained breathing apparatus
Combustibility: The compound does not burn on its own, though containers and others materials around the product may catch fire
Personal Precautions: Wear gloves, goggles, mask or respirator, protective clothing, minimize dusty conditions
Environmental Concerns: Prevent release into water bodies or soil to avoid toxic downstream effects, contain spills with barriers or absorbent material
Cleanup Procedure: Carefully sweep or shovel solid material into designated waste containers, clean affected area with plenty of water, air out the affected space
Handling: Maintain strong ventilation, use personal protective equipment, avoid creating dust and direct contact
Storage: Secure containers tightly closed in dry, well-ventilated, non-reactive storage rooms, segregate from acids and moisture
Special Precautions: Do not eat, drink, or smoke around the chemical, label storage areas clearly so emergency workers and colleagues know the risks
Spill Preparedness: Store suitable cleaning and containment materials on site, keep emergency eyewash and shower stations operational nearby
Engineering Controls: Use fume hoods, exhaust fans, and closed handling systems to keep airborne concentrations low
Personal Protection: Gloves rated for chemical resistance, wrap-around goggles, NIOSH-approved respirators, long sleeves and trousers
Hygiene Measures: Wash hands and exposed skin thoroughly after use, replace protective clothing if contaminated, never reuse single-use gloves
Physical State: Solid, fine crystalline powder
Color: White
Odor: Odorless
Melting Point: Decomposes before melting
Solubility: Soluble in water
Density: About 2.15 g/cm³
pH in Solution: Slightly acidic
Other Properties: Reacts with common acids and water under certain conditions to release dangerous gases
Chemical Stability: Stable under recommended conditions, breaks down if heated vigorously or mixed with strong acids
Incompatible Materials: Strong acids prompt hydrogen fluoride release, avoids contact with alkaline substances
Hazardous Decomposition: Ammonia, silicon tetrafluoride, hydrogen fluoride can appear if decomposition occurs
Acute Toxicity: Exposure leads to immediate irritation or damage to tissues, especially mucous membranes
Chronic Toxicity: Repeated exposure builds up fluoride levels in the body, which harms bones and teeth, occasionally linked to nervous system complaints
Sensitization: Prolonged or repeated contact triggers sensitivity or allergic reactions in some individuals
Medical Conditions Aggravated by Exposure: Asthma, kidney issues, or disorders affecting calcium levels may worsen if exposed
Aquatic Toxicity: Harmful to water life, with risk of bioaccumulation in plants or animals
Persistence and Degradability: Does not break down quickly in the environment, fluoride ions may remain mobile in water and soil
Environmental Mobility: Runoff after spills enhances contamination risk in surface and groundwater sources, negative effects extend to entire aquatic ecosystems
Product Disposal: Collect all residues and contaminated materials for disposal at hazardous waste facilities
Packaging Disposal: Triple rinse containers before recycling or disposal, follow local hazardous waste regulations
Precautions: Avoid dumping even small amounts in regular trash or drains, check local and national rules for what authorities require
UN Classification: Transported as a hazardous material
Transport Mode Considerations: Containers should be robust, sealed, labeled for toxic material, shielded from water and acids during travel
Accident Response: Carriers and handlers should have easy access to emergency procedures in case of leaks during movement
International Guidelines: Falls under regulations covering toxic and hazardous substances
Workplace Limits: Regulatory authorities set exposure limits for airborne dust or vapor, check with national guidelines for figures
Labeling Requirements: Hazard warnings must remain visible throughout product use and storage, updating labels after repacking supports safer handling
Community Safety: Rules often demand companies notify authorities before storing or transporting significant quantities near people or ecologically sensitive locations
