What Are the Main Hazards of Acetone?
Acetone (CH3COCH3, CAS 67-64-1) is the simplest ketone, a colorless, volatile, and highly flammable liquid widely used as a solvent and chemical intermediate. Its usefulness should not obscure its hazards, which fall into two broad categories: flammability and health effects.
The flash point of acetone is about -20°C, and its boiling point is 56°C, which means it evaporates quickly at room temperature and forms ignitable vapor-air mixtures even in cold environments. The vapor is heavier than air and can travel along the floor to distant ignition sources, so fire protection measures must treat acetone vapor as the primary risk. On the health side, acetone is a mild irritant and a central nervous system depressant at high concentrations, and repeated skin contact can defat the skin and cause dryness or dermatitis.
Health Effects of Acetone Exposure
Acute exposure to high vapor concentrations can produce anesthetic effects on the central nervous system, with symptoms such as weakness, nausea, headache, dizziness, and in severe cases, loss of coordination or unconsciousness. These effects are usually reversible when the person is moved to fresh air.
Long-term or repeated exposure can cause chronic irritation of the skin and respiratory system, with symptoms such as dryness of the skin, sore throat, and pharyngitis. Eye contact with liquid acetone causes stinging and irritation, while ingestion, although uncommon because of the strong taste, can cause nausea, vomiting, and abdominal pain. Occupational exposure limits are set by authorities such as OSHA and ACGIH, and workplace air monitoring is recommended where acetone is used in enclosed spaces.
Flammability and Fire Risks
Acetone is classified as a highly flammable liquid. Because of its low flash point and high evaporation rate, even small leaks can produce flammable vapor concentrations quickly. Static electricity generated during pouring, pumping, or wiping with synthetic cloths can ignite the vapor, so containers and transfer equipment must be bonded and grounded.
Fire-fighting considerations are also specific: water may be ineffective on acetone fires because the liquid is miscible with water and floats or spreads, so alcohol-resistant foam, dry powder, or carbon dioxide extinguishers are preferred. Firefighters must wear full protective equipment because burning acetone produces irritating and toxic combustion products.
Safe Storage Requirements for Acetone
Acetone must be stored in a cool, dry, well-ventilated area, away from heat sources, open flames, sparks, and incompatible substances such as strong oxidizers, acids, and peroxides. Storage areas should follow flammable liquid storage codes such as NFPA 30 and national hazardous chemical storage rules; the storage temperature should be kept below 35°C, and the area should be equipped with explosion-proof electrical fittings and local exhaust ventilation.
Containers should be kept tightly closed and stored on the ground or in approved cabinets, never in direct sunlight. It is worth noting that acetone stored or recycled over long periods can accumulate acidic impurities, which are corrosive to metals; therefore, containers must be inspected regularly and kept clean and dry. For bulk packaging, steel drums with an inner protective lining are commonly used, and the inside of each drum must be dry and free of rust or foreign matter before filling.
Handling, Transport, and Emergency Response
During loading, unloading, and transport, acetone must be protected from violent impact, direct sunlight, and rain. Vehicles and drums should be bonded to prevent static accumulation, and transport must comply with regulations for flammable liquids, including correct labeling and documentation.
Personal protective equipment for handling acetone includes chemical splash goggles, solvent-resistant gloves, and protective clothing. Work in ventilated areas or under local exhaust, and avoid breathing vapors. First-aid measures are straightforward: for skin contact, remove contaminated clothing and wash the skin thoroughly with soap and water; for eye contact, hold the eyelids open and rinse with running water or saline for at least 15 minutes, then seek medical attention; for inhalation, move the person to fresh air and keep the airway clear; if acetone is ingested, do not induce vomiting unless directed by medical personnel, rinse the mouth, and seek immediate medical treatment.
Frequently Asked Questions
Why is acetone considered a fire hazard?
Because its flash point is about -20°C and its boiling point is only 56°C, acetone produces ignitable vapor at normal ambient temperatures, and the vapor can travel to distant ignition sources. It is therefore classed as a highly flammable liquid.
What are the symptoms of acetone exposure?
Short-term exposure can cause headache, dizziness, weakness, nausea, and irritation of the eyes, nose, and throat. Repeated skin contact dries and defats the skin, and very high vapor concentrations can cause drowsiness or unconsciousness.
How should acetone be stored safely?
Store it in a cool, dry, well-ventilated area below about 35°C, away from heat, flames, sparks, and oxidizers, in tightly closed, grounded containers. Use explosion-proof electrical equipment in the storage area.
What should I do if acetone gets into the eyes?
Immediately rinse the eyes with running water or saline solution for at least 15 minutes while holding the eyelids open, then seek medical attention without delay.
Can acetone be stored in ordinary plastic drums?
Only in containers made of compatible materials. Acetone can soften or degrade many common plastics, so approved metal drums or containers rated for ketone solvents should be used, with the inside kept clean and dry.
What extinguishing agents work on acetone fires?
Alcohol-resistant foam, dry powder, and carbon dioxide are effective. Plain water spray may be used to cool exposed containers, but water streams should not be relied on to extinguish the fire itself because acetone mixes with water.
