Propylene oxide
CAS 75-56-9C3H6O58.08 g/mol
1,2-epoxypropane is an epoxide that is oxirane substituted by a methyl group at position 2. It is functionally related to an oxirane.
IUPAC: 2-methyloxirane
PubChem
Physical & Chemical Properties
| Melting Point | -169.83 °F (EPA, 1998) |
| Boiling Point | 93.61 °F at 760 mmHg (EPA, 1998) |
| Density | 0.859 at 32 °F (EPA, 1998) - Less dense than water; will float |
| Solubility | greater than or equal to 100 mg/mL at 66 °F (NTP, 1992) |
| Flash Point | -35 °F (EPA, 1998) |
| Vapor Pressure | 445 mmHg at 68 °F (EPA, 1998) |
| Appearance | Propylene oxide appears as a clear colorless volatile liquid with an ethereal odor. Flash point -35 °F. Boiling point 95 °F. Density 6.9 lb./gal. Flammable over a wide range of vapor-air concentrations. If contaminated, may polymerize with evolution of heat and possible rupture of container. Vapors irritate eyes, skin, and respiratory system. Prolonged contact with skin may result in delayed burns. Vapors heavier than air. Used as a fumigant, in making detergents and lubricants, and to make other chemicals. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2910
Data: UN Comtrade
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