© 2026 Sinochem Nanjing Corporation,
All Right Reserved
Chemical name: Cyclopentanone
CAS number: 120-92-3
Appearance: Clear, colorless to slightly yellow liquid
Odor: Sweet, peppermint-like
Common uses: Solvent for resins, intermediate for pharmaceuticals and perfumes
Boiling point: Around 130°C
Molecular formula: C5H8O
Molecular weight: 84.12 g/mol
Synonyms: Ketocyclopentane, trimethylene ketone
Physical hazards: Flammable liquid and vapor, can catch fire if exposed to ignition sources
Health hazards: Causes skin and eye irritation, vapor may cause drowsiness or dizziness, harmful if inhaled or swallowed
Environmental hazards: Harmful to aquatic life, causes long-term negative effects in aquatic environments
GHS classification: Flammable liquid (Category 3), Acute toxicity (Category 4 oral, Category 4 inhalation), Eye irritation (Category 2), Specific target organ toxicity (single exposure, Category 3)
Component: Cyclopentanone
Purity: Typically 98-100%
Impurities: Minor ketones and cyclopentane traces, usually lower than 1%
Inhalation: Remove to fresh air, monitor for breathing difficulties, seek immediate medical help if symptoms like coughing, headache, or dizziness persist
Skin contact: Wash area thoroughly with soap and water, remove contaminated clothing, see a physician if irritation develops
Eye contact: Rinse thoroughly with running water for several minutes, keep eyelids open, get medical attention promptly
Ingestion: Do not induce vomiting, rinse mouth with water, seek immediate medical assistance, never give anything by mouth to an unconscious person
Suitable extinguishing media: Use dry chemical, foam, or carbon dioxide, avoid water jets that might spread the material
Specific hazards: Vapors can form explosive mixtures with air, hazardous decomposition can produce carbon monoxide and carbon dioxide
Special protective equipment: Firefighters should wear self-contained breathing apparatus and full protective clothing
Advice for firefighters: Move containers from fire area if possible, cool with water spray from a safe distance to prevent pressure buildup and possible explosion
Personal precautions: Evacuate unprotected people, ventilate area, avoid contact with skin and inhalation of vapors, use personal protective equipment
Environmental precautions: Prevent entry into sewers, soil, and waterways, inform regulatory authorities if significant spill occurs
Methods for cleanup: Absorb with inert material such as sand, collect and dispose properly, avoid generating dusty or highly concentrated vapor conditions
Handling: Work in well-ventilated areas, ground containers to prevent static buildup, wear appropriate protective clothing and eye protection, avoid breathing vapors
Storage: Store in a cool, dry, well-ventilated place, keep away from sources of ignition including open flames and sparks, use approved containers, segregate from oxidizers and acids
Special storage considerations: Protect containers from direct sunlight and extremes of heat, always keep tightly sealed
Occupational exposure limits: Consult local regulations and recommendations, NIOSH and ACGIH may set suggested threshold limits
Engineering controls: Use fume hoods, local exhaust, or mechanical ventilation to keep vapor levels below recommended limits
Personal protection: Wear chemical-resistant gloves, protective goggles, and flame-resistant lab coats, use approved respirators if exposure exceeds limits
Hygiene: Wash hands thoroughly after handling, never eat, drink, or smoke during use, remove contaminated clothing promptly
Appearance: Clear to pale yellow liquid
Odor: Sweet, peppermint-like
Boiling point: Approximately 130°C
Melting point: -51°C
Flash point: Roughly 25°C (closed cup)
Vapor pressure: About 12 mmHg at 20°C
Solubility: Moderately soluble in water, miscible with most organic solvents
Density: Approximately 0.95 g/cm³ at 20°C
Chemical stability: Remains stable under normal temperatures and pressures
Conditions to avoid: Heat, flames, sparks, strong oxidizing agents
Incompatible materials: Strong acids, bases, oxidizers, reducing agents, can react vigorously
Decomposition products: Burning or thermal decomposition creates carbon monoxide, carbon dioxide, and possibly irritating fumes
Routes of exposure: Inhalation, ingestion, skin and eye contact
Acute effects: Causes moderate skin and eye irritation, exposure to high vapor concentrations may lead to headache, dizziness, drowsiness, nausea, and possible unconsciousness
Chronic effects: Prolonged or repeated exposure can cause dermatitis or other skin conditions, some animal research points to central nervous system depression at high doses
LD50 values: Oral rat LD50 around 1600 mg/kg, inhalation LC50 rat (4h) above 20 mg/L
Aquatic toxicity: May be toxic to aquatic life, incidents of fish and invertebrate toxicity observed in laboratory studies
Persistence and degradability: Biodegradable in the environment, but the persistence depends on local conditions
Bioaccumulative potential: Low potential for bioaccumulation in organisms
Mobility in soil: Likely to move through soil and may contaminate water tables if not handled correctly
Product disposal: Dispose of as hazardous chemical waste in accordance with municipal, state, and federal regulations, never pour down the drain or into open land
Container disposal: Triple rinse empty containers, puncture and recycle or dispose of in an approved facility, prevent reuse for food or drink storage
Special considerations: Incineration can be an option only in properly equipped facilities with emission controls
UN number: 2245
Proper shipping name: Cyclopentanone
Hazard class: 3 (flammable liquid)
Packing group: III
Transport labels: Flammable liquid symbol
Precautions: Ship in approved containers, keep away from incompatible materials, ensure proper labeling and documentation follows regulatory requirements
OSHA: Classified as hazardous under the Hazard Communication Standard
SARA Title III: Handles as a hazardous substance depending on quantity and usage patterns
TSCA: Listed on the Toxic Substances Control Act inventory
International regulations: Covered by REACH (EU), included in the inventories of Canada, Australia, and Japan
Workplace labeling: Use clear containers with visible hazard symbols and standardized warnings
Additional considerations: Facilities storing above threshold amounts may require special emergency planning and reporting provisions; check local and national guidelines frequently as these can change
