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Chemical Name: Octafluorocyclobutane
Common Names: Perfluorocyclobutane, C4F8
CAS Number: 115-25-3
Appearance: Colorless, odorless gas
Uses: Semiconductor manufacturing, plasma etching, refrigerant, dielectric gas
Boiling Point: -5.8°C
Synonyms in Industry: Rarely goes by any nickname in day-to-day operations, just C4F8
Classification: Compressed gas, simple asphyxiant
Health Effects: High concentrations displace oxygen, can lead to dizziness, nausea, or suffocation. Skin and eye contact rarely results in direct injury, but frostbite risk comes up from escaping compressed gas.
Flammability: Not flammable under typical conditions
Notable Risks: Sudden release may propel containers, cold gas from leaks can freeze exposed tissues
Acute Hazards: Immediate oxygen deprivation, risk of high-pressure gas leaks causing physical injury
Main Ingredient: Octafluorocyclobutane (Purity frequently exceeds 99%)
Impurities: Minute traces of other perfluorinated compounds, but not generally significant
Chemical Formula: C4F8
Structure: Four carbon atoms arranged as a ring, each with two fluorine atoms
Inhalation: Remove affected person to fresh air, monitor for breathing difficulty, seek medical help if recovery lags. CPR is needed if breathing stops.
Skin Contact: Rinse areas affected by frostbite with warm water, never hot. Do not rub. Remove clothing frozen to skin after thawing.
Eye Contact: Flush eyes gently with plenty of water. Medical attention for any changes in vision or persistent pain.
Ingestion: Not a standard risk for gases, but never induce vomiting if exposure occurs.
Emergency Medical: Focus on restoring normal breathing and handling cold injury as priority steps.
Flammability: Does not burn in air. Decomposes above 385°C, generating hazardous hydrogen fluoride and carbonyl fluoride in flames.
Appropriate Extinguishing Media: Water spray, foam, dry chemical for surrounding fires
Specific Hazards: Belt out of the area if gas releases under fire conditions, since combustion byproducts bring their own health threats
Protective Equipment: Firefighters stick with full protective suits and self-contained breathing apparatus, especially since fluorinated byproducts sting the lungs and skin
Thermal Decomposition Products: Hydrofluoric acid, carbonyl fluoride among others; highly toxic and corrosive
Personal Precautions: Evacuate area, ventilate, stay upwind and avoid low spaces since heavy gases settle
Protection: Use air-supplied respirators if oxygen dips or gas concentration rises. Gloves that withstand low temperatures, goggles for eye splash risk.
Clean Up Approach: Ventilate to disperse gas, isolate area until air clears. Avoid contact with released cold gas.
Environmental: Keep out of confined or poorly ventilated spaces. Avoid discharge in enclosed environments that people might enter.
Storage: High-pressure cylinders in ventilated, fireproof rooms, out of sunlight. Strap or chain cylinders well. Keep temperature steady and below boiling point.
Handling: Only open valves slowly, keep equipment designed for high-purity corrosive gases. Avoid dropping cylinders or exposing them to mechanical shock.
Mixing with Other Substances: Avoid welding or hot work on containers. Prevent entry of moisture into storage or process lines.
End of Use: Ensure empties are purged and valve-protected before returning or recycling.
Ventilation: Use in areas with mechanical exhaust and constant monitoring for leaks, especially since gas asphyxiation risk jumps without airflow
Personal Protection: Chemical-resistant gloves, safety goggles, face shields for operations at risk of splash or cold exposure, full-face respirator if regular air quality dips
Clothing: Long sleeves, flame-resistant lab coats for lab settings, insulated gloves for anyone handling liquid phase or cold gas releases
Workplace Monitoring: Oxygen monitors, leak detection systems, automatic shut-off on major lines
State: Gas at room temperature, smells like nothing to most noses
Molecular Weight: 200.03 g/mol
Boiling Point: -5.8°C
Melting Point: -40°C
Density: Gas is over four times heavier than air, pools at the lowest point
Solubility: Barely dissolves in water, quite soluble in nonpolar organics
Vapor Pressure: High at room temperature, explains fast expansion and potential for pressurization in closed spaces
Appearance: Crystal-clear and invisible under normal lighting
Stability: Stable under most room conditions, but breaks down at high heat
Incompatible Materials: Packed with energy, so avoid contact with alkali metals, concentrated fluorine, or very hot surfaces
Hazardous Decomposition: Yields hydrogen fluoride and carbonyl fluoride if burned or heated past decomposition point, both bring high toxicity to lungs and skin
Polymerization: Unlikely in storage or use in the normal temperature range
Routes of Exposure: Inhalation stands out as the worry; skin and eyes can suffer frostbite from expanding cold gas
Symptoms: Headache, drowsiness or unconsciousness at high concentrations in confined spaces. Typical exposures in industrial use rarely draw direct toxicity complaints, but asphyxiation remains a serious threat
Delayed Effects: Asphyxiation can cause lasting injury if oxygen loss lasts several minutes; frostbite leads to tissue damage, slow healing, or scarring if untreated
Chronic Risks: No strong evidence for chronic effects from short, controlled use, but exposure to HF or decomposition products carries much greater risk
Environmental Impact: Not biodegradable, persists in the atmosphere; considered a greenhouse gas with a long atmospheric lifetime, contributing to climate warming
Aquatic Toxicity: Not much evidence for direct aquatic toxicity, yet persistence and global warming potential support minimizing releases
Soil and Water Mobility: Low water solubility and high vapor pressure lead to persistence primarily in air rather than water or soil
Bioaccumulation: Unlikely to accumulate in tissues of living things due to its chemical stability and low solubility
Preferred Disposal: Capture unused gas, return pressurized containers to suppliers for reprocessing or recycling. Gases dumped directly to the environment worsen climate impact
Destruction: Thermal destruction only in specialized incinerators with scrubbing for hydrogen fluoride produced—they pull out the dangerous byproducts before air release
Residue Handling: Treat empty cylinders as hazardous, since residual gas can still pose risks. Never vent indoors.
Local Regulations: Follow strict regional and national rules—many countries track emissions from greenhouse gases, and fines ride heavy on improper disposal
Packaging: Ship in tightly sealed, pressure-rated steel cylinders
Labeling: Compressed gas labeling, nonflammable gas placards required for all shipments
Hazards in Transit: Protect from rising temperatures, physical shock, and ensure valves are closed and capped, keep upright and secure during movement
Documentation: Accompany every shipment with shipping papers that spell out risks, actions in emergencies, and basic health information
Highway, Rail, Air: Category for hazardous material transport; restrictions on passenger aircraft, strict routing for bulk rail or truck
Spills and Incidents: Protocols in place for accidental release, rerouting or temporary storage during emergencies
Occupational Limits: No specific exposure limits set by OSHA or ACGIH for octafluorocyclobutane itself, but oxygen monitoring is legally required in workplaces where displacement gases enter the picture.
Environmental Regulations: U.S. EPA includes perfluorocyclobutanes in greenhouse gas reporting; strict limits on industrial venting in many countries.
HazCom Standards: All containers must include hazard statements for asphyxiation and compressed gas.
Worker Training: Legal requirement for documented handling training—emphasizes asphyxiation, cold burns, and safe transport.
Import and Export: Subject to customs and environmental law due to global warming impact, shipments monitored closely for compliance.
