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Chemical name: 1-Chloro-1,1-difluoroethane
Common names: HCFC-142b, R-142b
CAS number: 75-68-3
Formula: C2H3ClF2
Appearance: Typically a colorless gas with a faint sweet odor
Uses: Refrigerant, foam blowing agent, chemical intermediate
Physical hazards: Gas under pressure; may explode if heated; can displace oxygen in confined spaces
Health hazards: Inhalation may cause dizziness, headaches, unconsciousness with prolonged or high exposure; contact with skin might lead to frostbite due to rapid evaporation; long-term exposure can affect central nervous and cardiac systems
Environmental hazards: Contributes to greenhouse gas emissions; potential to deplete ozone though less than older chlorofluorocarbons
Signal word: Warning
Precautionary statements: Use outdoors or in well-ventilated area; avoid breathing gas; keep away from heat, sparks, open flames; store properly to prevent accidental release
Component: 1-Chloro-1,1-difluoroethane
Concentration: 100 percent in pure form
Impurities: Usually minimal, but breakdown products can include hydrogen chloride, chlorine, and phosgene in combustion
Inhalation: Remove to fresh air immediately; monitor breathing; deliver oxygen if breathing becomes difficult; seek medical attention if symptoms persist
Skin contact: Treat frostbite by soaking in lukewarm water; avoid rubbing; remove contaminated clothing
Eye contact: Flush gently with water for several minutes; seek medical attention if irritation lingers
Ingestion: Highly unlikely due to gaseous form, but if exposed, get medical help without delay
Suitable extinguishing media: Use dry chemical, carbon dioxide, or water spray for surrounding fire
Specific hazards: Pressurized containers may explode when exposed to heat, releasing toxic gases such as hydrogen fluoride, hydrogen chloride, and carbonyl compounds
Protective equipment: Wear self-contained breathing apparatus and chemical-resistant clothing
Fire-fighting tips: Cool containers with water spray; avoid inhaling combustion vapors; evacuate the area if significant fire develops
Personal precautions: Evacuate the area; ventilate space; wear proper respiratory protection
Environmental procedures: Prevent release into sewers, surface waters, or confined spaces
Cleanup methods: Stop leak if safe to do so; ventilate area; use non-sparking tools; avoid direct skin contact with liquid or rapidly vaporizing gas
Handling advice: Only use equipment rated for pressurized, liquefied gas; avoid inhaling vapors; ground and bond containers before transfer
Storage guidance: Store in cool, well-ventilated area away from direct sunlight, heat sources, and incompatible materials like oxidizers; keep containers tightly closed and secured; prevent physical damage to cylinders
Exposure limits: Values set by regulatory bodies such as OSHA and ACGIH often range in the low hundreds of ppm for an 8-hour workday
Engineering controls: Use local exhaust ventilation to minimize vapor exposure
Protective gear: Wear chemical-resistant gloves, safety goggles, flame-retardant clothing; use approved respiratory protection in poorly ventilated areas or in emergencies
Work practices: Wash hands after handling; prohibit eating, drinking, or smoking near the product; inspect equipment for leaks before use
Physical state: Gas at room temperature; liquefies under pressure
Color: Colorless
Odor: Slightly sweet, similar to other halocarbons
Boiling point: -9.3°C
Melting point: Below -145°C
Vapor pressure: About 2800 mmHg at 20°C
Solubility: Low solubility in water; readily miscible with some organic solvents
Density: Approximately 1.22 g/cm³ (liquid at 25°C)
Chemical stability: Stable under recommended storage conditions
Conditions to avoid: Heat, open flame, electrical sparks, welding arcs
Incompatible materials: Strong oxidizers, alkali metals, powdered aluminum
Hazardous byproducts: Combustion or breakdown can produce toxic and corrosive gases such as phosgene, hydrogen chloride, hydrogen fluoride, chlorine gas
Polymerization: Not known to polymerize under normal conditions
Acute toxicity: High concentrations can cause respiratory depression, loss of consciousness; convulsions and irregular heartbeat have occurred at very high exposures
Chronic effects: Repeated inhalation might contribute to slight anesthetic effects or be linked to liver and kidney changes; no clear evidence for carcinogenicity in humans
Routes of exposure: Inhalation most common; skin and eye contact can cause cold burns or local irritation
Symptoms: Lightheadedness, confusion, incoordination, nausea, cardiac sensitization possible in certain individuals or under exertion
Environmental impact: Moderately persistent in the atmosphere with lifetime measured in years; breakdown in the upper atmosphere contributes to ozone layer thinning
Aquatic toxicity: Low direct toxicity to fish and aquatic life, though vapor phase emission is of greater concern
Bioaccumulation: Not expected to build up significantly in organisms
Mobility: Moves rapidly into the atmosphere; does not remain in soil or water for long periods
Waste treatment: Reclaim or return unused product for reuse or proper recycling; never vent large amounts to atmosphere
Disposal methods: Follow local and federal regulations for disposal by high temperature incineration; avoid landfilling or water release
Container disposal: Completely empty and discharge pressure before disposal; return cylinders to supplier for reuse where possible
UN number: UN2517
Proper shipping name: 1-Chloro-1,1-difluoroethane or Refrigerant gas R-142b
Hazard class: Compressed gas (2.2, non-flammable)
Packing group: Not assigned due to gas status
Label requirements: Handle as a pressurized gas, ensure proper cylinder restraints during transit and storage
U.S. regulation: Listed under the Clean Air Act as an ozone-depleting substance, with phased restrictions for many uses
Global treaties: Controlled by the Montreal Protocol for phase-out due to environmental impact; different restrictions and allowances country by country
Workplace limits: Regulated by OSHA and ACGIH; personal exposure monitoring often required in industrial settings
Environmental reporting: Required for large usage sites in many countries; reporting thresholds established for greenhouse gas inventories
