Solvents
REACH
Cyclopentane
CAS Number
287-92-3
EC Number
206-016-6
Abbreviation
CP, C5H10
What is Cyclopentane?
Cyclopentane (CAS 287-92-3) is a saturated cyclic hydrocarbon used primarily as a blowing agent and specialty solvent.
Where is Cyclopentane used?
- Rigid polyurethane foam: dominant blowing agent for insulation panels in refrigerators, freezers and cold-chain equipment
- Replacement for older HFC-based alternatives under environmental regulations
- Pharmaceuticals: reaction solvent and extraction medium in API synthesis requiring a non-polar, low-residue profile
- Fragrance and flavour: carrier solvent delivering volatile aroma compounds at controlled evaporation rates
- Lubricants: process solvent during synthesis and blending of cycloparaffinic base stocks
- Its low boiling point and high purity support controlled volatility in processing.
Good to know: Pharmaceutical-grade material is available with documentation aligned with ICH solvent guidelines.
Commercial specifications
- High-purity technical grade (95%+)
- Polyurethane foam-grade with tightly controlled purity specifications
- Liquid, in drums, IBCs and bulk tanker quantities
Other Names (Synonyms)
T86PB90RNU|Zeonsolv HP|Exxsol Cyclopentane S|C5H10|CP, C5H10
What are the physical properties of Cyclopentane?
Melting Point -93.9 °C
Boiling Point 49.2 °C @ Press: 760 Torr
Density 0.7457 g/cm³ @ Temp: 20 °C
Flash Point −35 °F
Appearance colourless liquid with a petrol-like smell
Color White
Odor Like gasoline; mild, sweet.
Form Powder
Water Solubility Miscible with ethanol, ether and acetone. Slightly miscible with water.
Vapor Pressure 18.93 psi ( 55 °C)
Refractive Index n 20/D 1.405(lit.)
Log P 3 at 20℃
How is Cyclopentane classified and handled safely? Learn More
Danger
GHS02· Flammable GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H225 Highly Flammable liquid and vapor
H304 May be fatal if swallowed and enters airways
H315 Causes skin irritation
H319 Causes serious eye irritation
Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P240 Ground and bond container and receiving equipment.
P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment.
Which trade and regulatory codes apply to Cyclopentane?
HS Code 29021990
UN Number 1146
ADR Class 3
Packing Group II
Storage Class 3 - Flammable liquids
WGK (Germany) 1