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Chemical name: Propyl Butyrate
Other names: Butyric acid propyl ester
CAS number: 105-66-8
Molecular formula: C7H14O2
Description: A colorless liquid that comes with a fruity odor, often showing up in flavoring, fragrance, or solvent use. Propyl Butyrate hardly passes unnoticed in the lab thanks to its distinctive scent and volatility.
Main hazards: Flammable liquid and vapor; can cause eye and skin irritation; inhaling vapors may lead to dizziness or drowsiness
GHS classification: Flammable Liquid (Category 3); Eye Irritant (Category 2A); Skin Irritant (Category 2)
Symbols: Flame, Exclamation mark
Routes of exposure: Eyes, skin, inhalation
Component: Propyl Butyrate
Concentration: Generally 99% or higher
Impurities: Usually minimal, but trace organic acids or alcohols from synthesis may linger
Eye contact: Immediately flush with plenty of water, keep eyelids apart, seek medical attention if pain or redness sticks around
Skin contact: Wash thoroughly with soap and water; contaminated clothing needs removal
Inhalation: Move to fresh air; seek medical attention if symptoms like dizziness develop
Ingestion: Rinse mouth; do not induce vomiting; get medical help if feeling unwell
Suitable extinguishing media: Foam, dry chemical, carbon dioxide
Unsuitable media: Water stream may spread liquid
Special hazards: Vapors may travel and flash back; combustion can produce irritating or toxic gases
Protective equipment: Firefighters need full protective gear and self-contained breathing apparatus
Personal precautions: Evacuate area, prevent inhalation of vapors, use protective gear
Environmental precautions: Prevent entry to drains or waterways
Clean-up methods: Contain spill, use inert absorbent material, ventilate area well, dispose according to regulations
Handling: Use in well-ventilated areas, avoid ignition sources, prevent skin and eye contact with proper gloves and goggles
Storage: Keep containers tightly closed in a cool, dry, well-ventilated spot away from strong oxidizers or acids; store in approved flammable liquid containers
Engineering controls: Use fume hoods or local exhaust ventilation
Personal protection: Chemical-resistant gloves, splash-proof goggles, flame-resistant lab coat or apron
Respiratory protection: Use a suitable respirator if vapor concentration exceeds limits or ventilation lags
Appearance: Colorless liquid
Odor: Fruity, noticeable even at low levels
Molecular weight: 130.19 g/mol
Boiling point: Around 146 °C
Melting point: -85 °C
Solubility: Slightly soluble in water; mixes well with most organic solvents
Vapor pressure: Moderate, contributes to evaporation
Density: About 0.875 g/cm³ at 20 °C
Chemical stability: Stable under normal temperatures and pressures, but susceptible to acid or base hydrolysis over time
Reactivity: Reacts with strong oxidizers, acids, alkalis
Decomposition products: May produce CO and CO2, as well as irritating fumes in fire or high heat
Acute toxicity: Can cause irritation or discomfort if ingested, inhaled, or from contact with eyes or skin
Long-term exposure: No clear evidence of carcinogenicity or reproductive impact, but repeated high exposure may sensitise skin or respiratory tract
Symptoms: Vapors may bring headaches, dizziness, possible nausea; skin or eye contact leads to redness, irritation or pain
Environmental impact: Can be moderately toxic to aquatic life; vaporizes easily so spills evaporate but may leave residue that pollutes water
Biodegradability: Readily biodegradable, breaks down in natural conditions over days to weeks
Bioaccumulation: Unlikely, no evidence for buildup in animal tissues
Methods: Collect waste in sealed, labeled containers; incineration preferred in licensed facility; avoid release to environment
Precautions: Don’t pour down drains or mix with regular trash; let professionals handle final disposal
Classification: Flammable liquid for shipping and storage
Regulatory codes: Properly labeled and documented under DOT, ADR, IMDG, IATA standards
Packing: Use containers designed for flammable liquids, secure all closures, shield from heat or sparks in transit
Labelling requirements: Clear hazard warnings and storage instructions; comply with OSHA, GHS, and region-specific chemical regulations
Record-keeping: Maintain usage and storage logs for safety inspections
Workplace controls: Access restricted to trained personnel with up-to-date chemical safety training
