Looking at Trifluoroacetic Anhydride Safety Through Experience

Identification

Chemical Name: Trifluoroacetic Anhydride
Chemical Formula: C4F6O3
Synonyms: TFAA
CAS Number: 407-25-0
Appearance: Clear, colorless to pale yellow liquid
Odor: Sharp, pungent odor

Hazard Identification

Hazard Class: Corrosive, causes severe skin burns and eye damage
GHS Label: Danger
Health Hazards: Harmful if inhaled or swallowed, may cause respiratory irritation, can produce severe burning on direct skin contact, target organ effects in the respiratory and digestive systems
Environmental Hazards: Harmful to aquatic life, persistent in water, can bioaccumulate
Pictograms: Corrosive, acute toxicity, environment

Composition / Information on Ingredients

Main Component: Trifluoroacetic Anhydride (pure or greater than 99%)
Impurities: None expected in high-purity preparations used in labs, trace moisture may hydrolyze to form trifluoroacetic acid

First Aid Measures

Inhalation: Move to fresh air immediately, keep person at rest, seek medical attention for breathing difficulty or unusual symptoms
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with water, seek medical help for burns, no delay
Eye Contact: Rinse cautiously with clean water for at least 15 minutes, hold eyelids open, immediate medical attention is essential
Ingestion: Do not attempt to induce vomiting, rinse mouth out, provide water if the person is conscious, urgent hospital treatment needed

Fire-Fighting Measures

Flammability: Not highly flammable, can release toxic and corrosive gases upon decomposition—mainly hydrogen fluoride, carbon oxides
Extinguishing Media: Use water spray, dry chemical, or carbon dioxide. Do not use water jets directly, as vigorous reaction may occur
Special Precautions: Wear full protective suit and self-contained breathing apparatus, avoid inhalation of combustion gases
Fire Hazards: Reactions generate dense, irritating fumes, risk of violent reaction with water if significant amounts are present

Accidental Release Measures

Precautions: Wear full chemical-resistant gear, ventilate area, evacuate if necessary when vapor is strong
Containment: Prevent chemical from entering drains, use inert absorbent material to soak up spill
Cleanup: Neutralize cautiously with suitable base, sweep into airtight waste container, proper ventilation required, avoid splashes
Disposal: Collected material should go to approved waste facility, clean surface thoroughly, avoid direct handling

Handling and Storage

Safe Handling: Ensure good ventilation in work area, open containers in fume hood, avoid direct contact with skin, use only non-sparking tools, keep containers tightly closed when not in use
Storage Requirements: Store in cool and dry place, use corrosion-resistant containers, segregate from water, alcohols, acids, and bases, keep away from heat sources and ignition points
Special Considerations: Never store in metal containers, reaction with water or moist air can cause pressure buildup and rupture

Exposure Controls and Personal Protection

Permissible Exposure Levels: No established workplace exposure limits, minimize all exposure
Engineering Controls: Use chemical fume hood at all times, provide local exhaust
Personal Protective Equipment: Wear acid-resistant gloves, splash-proof goggles, lab coat or chemical suit, face shield as needed, approved respiratory protection when airborne concentrations are likely
Hygiene: Wash thoroughly after handling, remove contaminated clothing immediately, do not eat or drink in work area

Physical and Chemical Properties

Physical State: Liquid
Color: Colorless to pale yellow
Boiling Point: 39°C
Melting Point: –63°C
Vapor Pressure: High at room temperature
Solubility: Reacts violently with water to form trifluoroacetic acid
Density: About 1.51 g/cm³
Odor Threshold: Strong, sharp odor noticeable at low concentrations
Other: Highly reactive with moisture, volatile

Stability and Reactivity

Chemical Stability: Stable under dry, cool, and inert conditions
Reactive With: Water, alcohols, bases, oxidizers, amines
Decomposition Products: Hydrogen fluoride, carbon oxide gases, trifluoroacetic acid
Hazardous Polymerization: Not expected under normal handling
Special Notes: Rapid hydrolysis occurs on contact with water

Toxicological Information

Routes of Exposure: Inhalation, oral, skin, eyes
Acute Effects: Severely corrosive to skin and eyes, burns, film-forming eye injury, can cause respiratory tract burns
Long-term Effects: Extended exposure may harm respiratory tissues, potential for lung edema, repeated exposure may damage teeth and cause systemic effects
Reference Animal Studies: Experiments indicate corrosive action, no significant data for carcinogenicity, mutagenicity, or reproductive toxicity in available literature up to now

Ecological Information

Aquatic Toxicity: Harmful to aquatic organisms, persistent, toxicity increases in presence of acidification
Persistence and Degradability: Slow degradation in water due to stability of trifluoroacetic acid
Bioaccumulative Potential: Can accumulate in aquatic environments due to stable fluorinated products
Mobility in Soil: Moderate to high mobility, persistence means potential to reach groundwater
Other Effects: Acidification from hydrolysis affects water pH, long-lasting impact possible

Disposal Considerations

Preferred Disposal: Contact a licensed chemical disposal company, incineration in approved facility
Container Handling: Rinse thoroughly with neutralizing solution, dispose of containers as hazardous waste
Precautions: Do not mix with incompatible materials, do not pour down drain or release to environment

Transport Information

Transportation Class: Regulated as a dangerous good for land, air, and sea
Packing Group: II
UN Number: 2698
Hazard Labels: Corrosive, toxic
Storage in Transit: Keep upright, secure against movement, protect from moisture during shipment, emergency response guidance required for incidents

Regulatory Information

Classification: Covered under chemical safety regulations for corrosives and organofluorine compounds
Reporting Requirements: Listed for hazard communication, subject to workplace controls for hazardous substances
Restrictions: Use by trained personnel only
Requirements: Safety measures, employee training, emergency plans, clear labeling, routine risk assessment
Environmental Controls: Discharge to environment restricted, facilities required to prevent accidental releases