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Product Name: Silicon Tetrafluoride
Chemical Formula: SiF4
CAS Number: 7783-61-1
Recommended Use: Used in electronics, semiconductors, fluorination, specialty glass, and as a chemical intermediate
Supplier: Manufacturer or distributor details must be included with a contact address and emergency telephone number
Synonyms: Tetrafluorosilane, Silicon(IV) fluoride
Emergency Overview: Colorless, pungent gas, reacts violently with water and moisture, can be extremely hazardous if inhaled or released
Hazard Classification: Compressed gas, Acute toxicity (inhalation), Skin corrosion, Eye damage
Signal Word: Danger
Hazard Statements: May cause severe respiratory tract irritation, chemical burns on skin and eyes, delayed lung edema, possible fatality after inhalation at high concentrations, reacts with moisture to produce hydrogen fluoride (HF)
Pictograms: Gas cylinder, Corrosive, Health hazard
Precautionary Statements: Keep away from water, use only outdoors in well-ventilated areas, avoid breathing gas or mist, use protective equipment for eyes and skin, avoid release into the environment
Chemical Composition: Silicon tetrafluoride, purity above 99.5%
Impurities: Hydrogen fluoride (trace), silicon dioxide (fumes when decomposing)
EC Number: 232-013-4
Molecular Weight: 104.08 g/mol
Inhalation: Remove the victim to fresh air immediately, supply oxygen if breathing is difficult, perform artificial respiration if breathing stops, seek urgent medical attention
Skin Contact: Rinse skin with running water for at least 15 minutes, remove contaminated clothing, do not use hot water on chemical burns, seek medical evaluation for deep or extensive exposure, watch for delayed symptoms
Eye Contact: Rinse eyes cautiously with lots of water for at least 15 minutes, keep eyelids open, remove contact lenses if possible, continue rinsing during transport to hospital
Ingestion: Not considered a common route due to gaseous form, in case of suspected ingestion, rinse mouth with water only if person is conscious, never induce vomiting, seek immediate medical attention
Medical Attention: Monitor symptoms for hours after exposure, delayed pulmonary edema may occur, specialized treatment required for chemical burns and fluoride toxicity
Flammability: Silicon tetrafluoride itself does not ignite, though it releases toxic and corrosive fumes when heated
Suitable Extinguishing Media: Dry chemical, carbon dioxide, or water spray in a fog pattern only when necessary, direct water contact causes hazardous gas formation
Hazardous Combustion Products: Hydrogen fluoride, silicon dioxide, fluorine-containing gases
Protective Equipment: Full-face self-contained breathing apparatus, chemical resistant suit, positive pressure safety gear, avoid inhalation of gases or vapors
Special Hazards: Cylinders may rupture under extreme heat, evacuate area to a safe distance, cool container with water spray from a distance, avoid water contact with leaking or spilled material
Personal Protection: Only trained personnel equipped with proper personal protective equipment (PPE) to conduct cleanup, use SCBA if ventilation is insufficient
Ventilation: Use explosion-proof ventilation, remove all ignition sources, evacuate unnecessary persons
Leak Response: Evacuate area, stop leak if safe without risk, contain and ventilate the affected area
Environmental Precautions: Prevent material from entering water sources or sewers, warn downstream users if release threatens water supply, report significant releases to relevant authorities
Neutralization: React residues with lime or soda ash in controlled environment, keep incompatible substances away
Handling: Only use in closed systems or in well-ventilated places, use corrosion-resistant containers and equipment, exercise caution during cylinder supply changes, never breathe vapors, wash hands thoroughly after handling
Storage Conditions: Store cylinders upright, secured against tipping, in a cool, dry, ventilated area designated for toxic compressed gases, separate from chemicals such as water, acids, and strong bases
Compatibility: Keep away from water and moisture, separate from reducing agents, avoid using reactive plumbing materials such as copper or brass
Storage Temperature: Keep away from heat or open flame, protect from direct sunlight and physical damage
Special Precautions: Label containers clearly, ensure emergency eye-wash and shower stations are available nearby, train staff in emergency procedures
Exposure Limits: OSHA PEL (TWA) 2.5 mg/m³ (as fluoride), NIOSH REL 2.5 mg/m³, ACGIH TLV 2.5 mg/m³
Engineering Controls: Use exhaust ventilation, gas detectors, and negative pressure rooms when possible, monitor airborne concentrations regularly
Personal Protective Equipment (PPE): Face shield, safety goggles, flame-resistant gloves, full-length chemical-resistant suit, boots, self-contained breathing apparatus for high-risk tasks
Hygiene Measures: Remove contaminated clothing promptly, avoid contact with skin and eyes, prohibit eating, drinking, and smoking in work areas
Appearance: Colorless, pungent gas
Odor: Sharp, suffocating, stinging
Boiling Point: -86°C (-123°F)
Melting Point: -89.3°C (-128.7°F)
Density: 1.66 g/L at 0°C
Solubility: Reacts with water to liberate heat and form silicon dioxide and hydrofluoric acid
Vapor Pressure: 2.62 MPa at 20°C
pH: Not applicable (gas)
Relative Vapor Density: 3.6 (air = 1)
Partition Coefficient: Not applicable
Chemical Stability: Stable under recommended storage conditions, sensitive to moisture
Reactivity: Reacts quickly with water, moisture, and alcohols to form hazardous products including HF
Incompatible Materials: Water, strong bases, alcohols, moist air, metals such as sodium or potassium
Hazardous Decomposition Products: Hydrogen fluoride, silicon dioxide dust, toxic fumes under fire conditions
Conditions to Avoid: Areas with high humidity, open flames, excessive heat, accidental exposure to water sources
Routes of Exposure: Inhalation main occupational hazard, contact with skin or eyes, accidental environmental release
Acute Effects: Severe respiratory irritation, chemical burns, persistent coughing, breathing difficulty, possible life-threatening lung edema
Chronic Effects: Prolonged low-level exposure may cause fluorosis, dental and skeletal changes, long-term respiratory issues
Symptoms: Choking, pain in nose and throat, cough, chest tightness, eye and skin burns
Target Organs: Lungs, respiratory tract, eyes, skin, bones (from fluoride toxicity)
Carcinogenicity: Not classified by IARC, NTP, or OSHA
LD50/LC50: LC50 (rat, 1 hour): 600 ppm
Ecotoxicity: Toxic to aquatic life due to formation of hydrofluoric acid in water, persistent in the environment
Persistence and Degradability: Breaks down upon contact with moisture, forms persistent inorganic fluorides
Bioaccumulation: Not expected to bioaccumulate significantly in organisms
Mobility in Soil: Mobile in moist environments, hydrolyzes rapidly, poses a risk to groundwater and surface water
Other Information: May damage vegetation, wildlife habitat through fluoride toxicity, requires immediate cleanup of accidental emissions
Waste Treatment Methods: Neutralize under controlled conditions using lime slurry or absorbent, avoid direct disposal into sewers or watercourses
Container Disposal: Return empty cylinders to supplier for reuse or proper disposal, do not puncture or incinerate pressurized containers
Regulations: Dispose in accordance with local, state, and federal regulations for hazardous waste—EPA hazardous waste number U207
UN Number: 1859
Proper Shipping Name: Silicon tetrafluoride, compressed
Hazard Class: 2.3 (Toxic gas), subsidiary risk 8 (Corrosive)
Packing Group: Not assigned for gases
Label Requirements: Toxic Gas, Corrosive
Special Transport Notes: Secure cylinders tightly, segregate from incompatible cargo, emergency action code and response guide must accompany shipment
Federal Regulations: Listed by US EPA TSCA inventory, considered a hazardous substance under CERCLA, subject to reporting under SARA Title III Section 313
State Regulations: California Prop 65 does not list silicon tetrafluoride specifically, fluoride emissions may be regulated
International Regulations: Complies with OSHA Hazard Communication Standard, REACH registered in the EU, classified under the UN Globally Harmonized System (GHS)
Other Information: Employers must ensure safety training, hazard communication, medical surveillance for workers handling this material
