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Chemical Name: N-Butyl Formate
Synonyms: Butyl formate
Chemical Formula: C5H10O2
Molecular Weight: 102.13 g/mol
Appearance: Clear, colorless liquid with a fruity odor
Common Uses: Solvent in coatings, flavoring agent, intermediate in organic synthesis
Smell: Fruity, reminds some people of rum or pears, often noticed before visual cues during a spill or leak
Classification: Flammable liquid, irritant to eyes, skin, and respiratory tract
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Health Risks: Vapor may cause drowsiness, dizziness, and headache. Contact irritates eyes and skin, potentially leading to burns or inflammation. Inhalation in poorly ventilated spaces can lead to coughing, wheezing, or feeling disoriented.
Flammability: Ignites easily, vapor forms explosive mixtures with air.
Warning Signs: Eye watering, coughing, skin redness, sometimes nausea; people working in facilities using this substance should look out for these firsthand cues.
N-Butyl Formate: Concentration usually over 99 percent in pure form, main active ingredient
Impurities: Trace water, possible formic acid, butyl alcohol in small amounts, especially in industrial-grade batches
Additives: Most sources do not add stabilizers or other chemicals, so risks tie closely to the base compound
Inhalation: Move individual into fresh air. Keep upright to help breathing. If breathing becomes difficult or symptoms worsen, medical attention offers the safest route.
Skin Contact: Wash with soap and water. Remove contaminated clothing. Seek medical evaluation if irritation holds or blistering appears.
Eye Contact: Rinse eyes with cool, clean water for several minutes. Keeping eyelids open gets better results. If irritation turns severe or vision gets impaired, emergency rooms or urgent care offer quick professional help.
Ingestion: Rinse mouth; do not induce vomiting. Medical help is best as swallowing solvents often causes a mix of stomach upset and central nervous system effects, and risks of aspiration grow if the person vomits.
Suitable Extinguishing Media: Alcohol-resistant foam, dry chemical powder, carbon dioxide
Specific Hazards: Burning n-butyl formate releases toxic vapors, like carbon monoxide and carbon dioxide, with black smoke in heavy fires. Containers exposed to flames risk violent rupture by overpressure.
Protective Equipment: Full protective gear and self-contained breathing apparatus make the difference between a safe response and serious injury for fire crews.
Firefighting Advice: Evacuate, stay uphill and upwind, focus on stopping vapor clouds from drifting toward occupied buildings or storage tanks.
Personal Precautions: Evacuate all non-essential staff. Avoid sources of ignition—cell phones, lighters, anything that could spark.
Protective Equipment: Chemical-resistant gloves, goggles, respirator if the air feels thick with fumes.
Containment: Neutralize with inert absorbents, like sand or vermiculite; avoid using combustible material such as sawdust and never flush with water directly.
Cleanup: Scoop spilled material into clearly labeled waste containers for proper disposal. Ventilate area as vapors can linger and create invisible hazards.
Handling: Use only in well-ventilated areas—windows open or fans running cut the vapor concentration down fast. Avoid breathing vapors or letting liquid stay on skin. Sturdy containers with tight-fitting caps help prevent leaks and accidental exposure.
Storage: Store away from heat, sparks, and open flames. Keep in cool, dry areas with fire-resistant shelves. Combustible storage cabinets work best in labs or facilities with constant use. Always keep separate from strong acids, oxidizing agents, and direct sunlight.
Engineering Controls: Local exhaust ventilation helps keep vapor levels in check. Fume hoods or ducted fans knock back the risk in confined labs.
Personal Protection: Safety goggles shield eyes. Impermeable gloves, often nitrile or neoprene types, guard skin. Lab coats or chemical aprons add a reliable defensive layer.
Respiratory Protection: Organic vapor cartridges or full-face respirators come into play if workplace air readings creep toward occupational exposure limits.
Hygiene: No eating, drinking, or smoking during use. Handwashing at every break and shift change keeps exposure low day to day.
Appearance: Clear, colorless liquid
Odor: Fruity, pleasant to some, strong and overwhelming to others
Boiling Point: Around 107°C
Melting Point: Below -80°C
Flash Point: Below 25°C, meaning it lights off easily at routine indoor temperatures
Vapor Pressure: Noticeable, so it evaporates quickly and spreads through the room if left uncapped
Solubility: Slightly soluble in water, mixes well with organic solvents
Density: Close to 0.87 g/cm³
Chemical Stability: Remains stable under typical storage and use conditions, but spills or open containers in sunlight or warmth let reactions and vapor spread happen faster
Incompatible Materials: Strong acids or oxidizers like nitric acid, sodium hypochlorite. Mixing with these can trigger heat buildup, gas release, or even fire.
Decomposition: Heat or burning releases formic acid fumes, carbon monoxide, and carbon dioxide—breathing these in is as unsafe as handling the solvent itself
Acute Effects: Short exposures cause eye, nose, skin, and throat irritation. High vapor intake leads to headaches, dizziness, drowsiness, or loss of coordination. Swallowing creates stomach upset, sedation, even chemical pneumonia risk if aspirated.
Chronic Effects: Regular or repeated exposure dries out skin, increases the chance of dermatitis, and poses risks to workers who handle open vats or drums daily. Animal studies indicate central nervous system depression, though data on reproductive or carcinogenic properties in humans remains incomplete.
Aquatic Toxicity: Dangerous for aquatic life at higher concentrations, especially since even small spills turn into contamination sources downstream.
Persistence: Breaks down in water, but the process can stress local habitats and cause changes to microbial populations in soil and streams.
Bioaccumulation: Not likely to accumulate in animal tissue, but high doses prove disruptive in the short term.
Waste Handling: Treat as hazardous waste—burning in approved incinerators or transferring to chemical waste management specialists cuts down on accidental emissions. Diluting and pouring into drains risks local water contamination, so robust collection and containment policies matter.
Container Disposal: Empty drums or bottles keep hazardous residues. Triple rinsing or piercing before landfill reduces future leak chances, but best practice remains returning containers to chemical suppliers or hazardous waste programs.
Transport Label: Flammable liquid, assigned to UN number 1993 for road, rail, or ship transport
Shipping Conditions: Specialist vehicles with fire-protected tanks minimize risk. Proper labeling and placarding alert emergency responders at all stages.
Risk in Transit: Sudden temperature changes in shipping trucks, or collisions, can turn routine hauls into hazardous emergencies—well-trained drivers and documented procedures for spills and leaks help limit consequences.
Classification: Listed as a hazardous chemical in most worker safety and fire codes
Regulations: Subject to workplace exposure standards in many countries, like OSHA's permissible exposure limits. Environmental agencies focus on spill prevention and reporting, especially if large tanks or drums are stored on site. Emergency planning and worker safety training for facilities handling large volumes are required by most jurisdictions to avoid repeated or systemic mishaps.
