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Chemical Name: Chlorine Trifluoride
Chemical Formula: ClF3
Common Name: Chlorine Trifluoride
Appearance: Colorless, toxic, corrosive gas or pale green-yellow liquid under pressure
Odor: Sharp, suffocating
Uses: Cleaning and etching in semiconductor production, nuclear fuel processing, rocket propellant, specialty oxidizing agent
Hazard Classifications: Oxidizer, Toxic, Corrosive, Reacts violently with most materials
Routes of Exposure: Inhalation, Skin contact, Eye contact
Acute Hazards: Severe chemical burns, respiratory damage, immediate burns to skin and tissue, intense irritation upon exposure
Chronic Hazards: Long-term lung damage, possible effects on teeth and bones, lingering respiratory problems
Pictograms: Exploding bomb, corrosion, skull and crossbones, gas cylinder
Signal Word: Danger
Precautionary Statements: Handle with extreme caution. Avoid all contact. Never allow contact with water, combustible materials, or organics.
Substance: Chlorine Trifluoride (ClF3)
Purity: High (>99%) in most applications
CAS Number: 7790-91-2
Impurities: Trace levels of chlorine or other halides from production but often specified as minimal due to high reactivity and need for purity in industrial applications
Inhalation: Remove person from exposure promptly. Administer oxygen as needed. Seek immediate medical attention. Respiratory symptoms such as cough, burning, or shortness of breath deserve serious consideration as damage progresses quickly.
Skin Contact: Remove contaminated clothing and rinse skin with copious water for at least 15 minutes. Immediate medical care is vital, as ClF3 can burn flesh and bone rapidly.
Eye Contact: Rinse eyes with water continuously for at least 15 minutes. Do not rub eyes. Emergency ophthalmological care is essential.
Ingestion: Immediate medical help required; do not induce vomiting.
Special Notes: Chlorine trifluoride reacts explosively with water. Emergency response requires full protection, as even small leaks or spills can prove catastrophic.
Flammability: Does not require air for combustion; supports burning of most materials. Metals, sand, asbestos, even glass and concrete can ignite or break down if exposed.
Suitable Extinguishing Media: Most standard agents fail to suppress chlorine trifluoride fires. Specialized Class D dry agents may delay fire spread, but containment is critical.
Hazardous Combustion Products: Releases toxic gases including hydrogen fluoride and chlorine gas.
Protective Equipment: Fully-encapsulated, non-reactive suits with self-contained breathing apparatus; firefighters confront extreme chemical risk.
Firefighting Advice: Evacuate area. Allow controlled burn if safe isolation is possible—the rapid reaction with water, foam, or CO2 makes standard tactics unsafe.
Procedures: Evacuate non-essential personnel. Eliminate all sources of ignition and incompatible materials. Use forced ventilation where possible. Specialized equipment such as remote handling tools and scrubbers is essential.
Personal Protection: Chemical-protective suits, gloves, and positive-pressure respirators.
Containment: Dike spill areas with non-reactive barriers only. Do not allow contact with water, organic materials, or metals. Emergency response relies on expertise and planning.
Cleaning Methods: Absorb gas in scrubber systems using compatible chemicals—not water. Dispose of waste through regulated hazardous materials routes.
Handling: Only trained specialists should move or use this substance. Keep containers tightly sealed. Use proper piping and valves made of resistant alloys like Monel or nickel. Never allow even traces of moisture in handling areas.
Storage: Store in cool, dry, well-ventilated, fire-resistant areas with specialized containment. Keep away from incompatible materials, moisture, and direct sunlight.
Precautions: Rigorous standards for leak testing and container maintenance prevent catastrophic release.
Container Guidelines: Use only approved, corrosion-resistant pressure vessels.
Engineering Controls: Local exhaust ventilation, gas detection alarms, remote automated systems
Workplace Standards: ACGIH TLV: 0.1 ppm (as F)
Personal Protection: Self-contained breathing apparatus, specialized chemical-resistant suits, gloves, face shields, and full-body gear
Emergency Procedures: Emergency eyewash and shower stations must be accessible but must not use water during release response
Hygiene Measures: Remove and isolate contaminated clothing, rigorous decontamination protocols
Appearance: Colorless gas or pale yellow-green liquid
Odor: Sharp, acrid, extremely irritating
Molecular Weight: 92.45 g/mol
Boiling Point: 11.8°C
Melting Point: -76°C
Density (liquid): Approximately 1.77 g/cm3 at 15°C
Vapor Pressure: Significant at room temperature
Solubility: Reacts violently with water; not meaningfully soluble due to instant reaction
Stability: Extremely reactive with most substances, including glass, metals, and many plastics
Chemical Stability: Highly unstable when exposed to moisture, organic material, combustible substances, and many metals.
Reactivity: Ignites or explodes in contact with almost all organic and many inorganic materials.
Incompatible Materials: Water, powdered metals, glass, ceramics, most plastics, and organic substances
Hazardous Decomposition Products: Releases toxic fumes of hydrochloric acid, hydrofluoric acid, and chlorine on decomposition or contact with water.
Polymerization: Not expected, main risks arise from violent chemical reactions.
Exposure Effects: Short-term effects include severe respiratory damage, pulmonary edema, skin and eye burns, and possible systemic toxicity through absorption. Breathing high levels damages mucous membranes and deep lung tissue.
Chronic Exposure: May result in long-term respiratory illness and bone damage due to fluorine uptake.
Symptoms of Exposure: Coughing, burning sensation, severe pain, blistering, tissue necrosis, and vision loss if exposed to eyes.
Carcinogenicity: Not classified as a human carcinogen, but repeated exposure increases risk of chronic disease.
Additional Notes: Immediate, proper medical intervention after exposure determines outcome quality; delays cause irreversible damage.
Environmental Fate: Reacts instantly with water and moist air, producing hydrochloric and hydrofluoric acid gases.
Aquatic Impact: Lethal to aquatic organisms due to acid formation; contamination leads to lasting toxicity in water sources.
Soil Impact: Rapid reaction with organic matter releases fluoride and chloride ions, potentially contaminating soil and ground water.
Persistence and Degradation: Does not persist in original form, but byproducts are hazardous and mobile.
Bioaccumulation: Little evidence, but fluoride and chloride ions may accumulate locally.
Methods: Only licensed hazardous waste handlers should dispose of this material, using dry chemical scrubbers. Never dilute or neutralize with water.
Packaging: Use sealed, corrosion-resistant containers during all stages of handling and transport.
Special Precautions: Transport to disposal destinations with reinforced protocols given catastrophic risk of spill or exposure.
Regulatory Compliance: Adherence to stringent hazardous waste rules protects personnel and environment.
UN Number: 1749
Hazard Class: 2.3 (Toxic gas), 5.1 (Oxidizing agent), 8 (Corrosive)
Labels: Toxic Gas, Oxidizer, Corrosive
Packing Group: Unique risk due to triple hazards; requires specialized, approved containers with triple-layer containment in transport.
Precautions: Inspections, escorted and monitored routes, emergency response planning at every stage of shipping
U.S. EPA: Listed as an extremely hazardous substance. Threshold planning quantities apply.
OSHA: Enforces strict exposure limits in the workplace and mandates emergency plans around storage.
DOT: Controls all transport with hazardous material rules, special routing, and strict signage.
International Controls: Similar restrictions under ADR, IATA, and IMDG codes; strict licensing and tracking.
Workplace Guidance: Facilities handling chlorine trifluoride operate under complete hazard communication and emergency preparedness programs consistent with occupational safety best practices, featuring robust technical training, public safety drills, and community hazard disclosure under right-to-know statutes.
