Substance profile
Cyclopentanone
Cyclopentanone is a water-white, mobile liquid with a distinctive ethereal odor, somewhat like peppermint.
01 · Identification
What Cyclopentanone is
Cyclopentanone is a water-white, mobile liquid with a distinctive ethereal odor, somewhat like peppermint. Its molecular formula is C5H8O and its molecular weight is 84.12 g/mol. It boils at 131 °C, melts at -51.3 °C.
Under the GHS it carries the signal word Warning. It is classed as flammable agents - 3rd degree.
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H226 | Flammable liquid and vapour. |
| H315 | Causes skin irritation. |
| H319 | Causes serious eye irritation. |
Precautionary statements: P210, P233, P241, P242, P264, P280, P302, P305, P313, P332, P337, P338, P352, P403
03 · Physical and chemical properties
Cyclopentanone properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 130.6 °C (267.1 °F) | at 760 mmHg | HSDB |
| 130.65 °C (267.2 °F) | at 760 mmHg | CAMEO | |
| 131 °C (267.8 °F) | ICSC | ||
| Melting point | -51.3 °C (-60.3 °F) | HSDB | |
| -51.28 °C (-60.3 °F) | CAMEO | ||
| -51 °C (-59.8 °F) | ICSC | ||
| Density | 0.95 g/cm³ | ICSC | |
| 0.9487 g/cm³ | at 20 °C | HSDB | |
| Solubility | Sol in alcohol, acetone, ether | HSDB | |
| Estimated water solubility of 9175 mg/l | HSDB | ||
| Solubility in water: poor | ICSC | ||
| Vapor pressure | 11.4 mmHg | at 25 °C | HSDB |
| 11.4 mmHg | Haz-Map | ||
| Flash point | 30.56 °C (87 °F) | HSDB | |
| 30 °C (86 °F) | CAMEO | ||
| 26 °C (78.8 °F) | ICSC | ||
| Vapor density | 2.3 (air = 1) | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Cyclopentanone
Reactivity
CYCLOPENTANONE polymerizes easily, especially in the presence of acids. Can react with oxidizing materials, i.e. hydrogen peroxide. (NTP, 1992)
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Cyclopentanone in the storage compatibility matrix →