Material Safety Data Sheet (MSDS) - Cyclopentane

Identification

Product Name: Cyclopentane
Chemical Formula: C5H10
CAS Number: 287-92-3
Synonyms: Pentamethylene, 1,2,3,4,5-Pentacyclopentane
Recommended Use: Refrigeration, Blowing agent for polyurethane foams, Laboratory chemical
Company Details: Manufacturer and supplier contact information, emergency telephone numbers

Hazard Identification

Classification: Flammable liquid (Category 2), Acute Toxicity (Category 4, Oral), Aspiration Hazard (Category 1)
Label Elements: Danger symbol, GHS02 (Flame), Signal word: Danger
Hazard Statements: Highly flammable liquid and vapor, Harmful if swallowed, May cause drowsiness or dizziness, May be fatal if swallowed and enters airways
Precautionary Statements: Keep away from heat and sources of ignition, Use explosion-proof equipment, Ground and bond containers during transfer

Composition / Information on Ingredients

Chemical Name: Cyclopentane
Concentration: 95-100%
Impurities: Trace hydrocarbons
Molecular Weight: 70.13 g/mol
EINECS Number: 206-016-6

First Aid Measures

Inhalation: Remove person to fresh air, keep at rest, seek medical attention if symptoms develop
Skin Contact: Remove contaminated clothing, rinse skin with water and soap, seek medical help for irritation
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present, seek medical advice if irritation persists
Ingestion: Do not induce vomiting, rinse mouth, immediately contact poison control or seek medical attention

Fire-Fighting Measures

Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide
Unsuitable Extinguishing Media: Water jet can spread fire
Special Hazards: Vapors may form explosive mixtures with air, combustion produces carbon monoxide and carbon dioxide
Firefighter Protection: Wear full protective gear and self-contained breathing apparatus
Special Procedures: Cool exposed containers with water spray

Accidental Release Measures

Personal Precautions: Evacuate area, ventilate space, use personal protective equipment
Environmental Precautions: Prevent run-off to drains, sewers, and waterways
Methods for Containment: Stop leak if safe, use inert absorbent materials
Cleanup Methods: Collect in containers for disposal, dispose of according to local regulations, wash site with water after material pickup

Handling and Storage

Handling: Avoid inhaling vapors, avoid contact with skin and eyes, use only in well-ventilated areas, ground and bond containers
Storage: Store in tightly closed containers, keep in cool well-ventilated place away from heat, sparks, and open flames, store away from oxidizers, acids, and bases, suitable construction material: carbon steel, stainless steel

Exposure Controls and Personal Protection

Control Parameters: Occupational Exposure Limit: 600 ppm (voluntary guideline)
Engineering Controls: Local exhaust ventilation, explosion-proof electrical equipment
Personal Protection:
- Respiratory Protection: Approved respirators for high concentration
- Skin Protection: Chemical-resistant gloves (e.g. nitrile or neoprene)
- Eye Protection: Safety goggles or face shield
- Hygiene Measures: Wash hands after use, remove contaminated clothing and wash before reuse

Physical and Chemical Properties

Appearance: Clear colorless liquid
Odor: Gasoline-like
Odor Threshold: Approximately 17 ppm
pH: Not applicable
Melting Point: -94°C
Boiling Point: 49.2°C
Flash Point: -37°C (Closed Cup)
Evaporation Rate: Rapid
Flammability (Solid, Gas): Highly flammable liquid
Upper/Lowe Explosive Limits: 1.4% (LEL) – 8.7% (UEL)
Vapor Pressure: 360 mmHg (20°C)
Vapor Density: 2.4 (air = 1)
Relative Density: 0.745 g/cm3
Solubility: Insoluble in water
Partition Coefficient (Log Kow): 3.4
Auto-ignition Temperature: 361°C
Decomposition Temperature: Not determined
Viscosity: 0.47 mPa·s (20°C)

Stability and Reactivity

Chemical Stability: Stable under normal conditions and recommended storage
Reactivity: May react with strong oxidizing agents
Hazardous Reactions: Highly flammable vapor can form explosive mixture with air
Conditions to Avoid: Heat, sparks, open flame, static discharge, incompatible materials
Incompatible Materials: Strong oxidizers (e.g., chlorine, peroxides)
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide

Toxicological Information

Acute Toxicity: Oral LD50 (rat): >5000 mg/kg, Inhalation LC50 (rat): 120,000 mg/m3 (4h)
Skin Corrosion/Irritation: Mild irritation
Eye Damage/Irritation: Mild irritation
Respiratory Effects: May cause central nervous system depression, dizziness
Chronic Effects: Prolonged or repeated exposure can cause irritation and possible kidney effects
Carcinogenicity: Not listed as carcinogen by IARC, NTP, or OSHA
Other Effects: Aspiration hazard if swallowed, may enter lungs and cause chemical pneumonitis

Ecological Information

Toxicity to Aquatic Life: Acute toxicity expected for aquatic organisms (fish LC50, daphnia EC50 in mg/L range)
Persistence and Degradability: Readily biodegradable in the environment
Bioaccumulative Potential: Moderate, log Kow indicates some potential for bioaccumulation
Mobility in Soil: Low, evaporates rapidly from surface
Other Information: Avoid release to environment, forms slick on water

Disposal Considerations

Waste Disposal Methods: Dispose in accordance with federal, state, and local laws, do not pour into drains
Contaminated Packaging: Containers should be emptied completely and disposed of as hazardous waste
Special Considerations: Incinerate under controlled conditions whenever possible

Transport Information

UN Number: UN1146
Proper Shipping Name: Cyclopentane
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: II
Label: Flammable liquid
Environmental Hazards: Not classified as marine pollutant
Transport Precautions: Secure containers, keep away from heat sources

Regulatory Information

Safety, Health and Environmental Regulations: Cyclopentane appears on chemical inventories such as TSCA (USA), DSL (Canada), EINECS (Europe), AICS (Australia), ENCS (Japan)
SARA Title III: Not listed as extremely hazardous
California Prop 65: Not on Proposition 65 list
Workplace Labeling: Follows OSHA’s Hazard Communication Standard
Other Relevant Regulations: Follow regulations for storage, handling, and waste under national and international laws