Properties of Propylene (C3H6)
Propylene, also known as propene, is a colorless and flammable gas with a faint petroleum-like odor. It is one of the basic building blocks of the petrochemical industry and is classified as an olefin or alkene. Propylene is used in the production of a wide range of products, including plastics, chemicals, and synthetic materials.
The following table provides a comprehensive list of propylene properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Molar Mass | 42.081 g/mol |
| Density (25°C) | 1.745 kg/m3 |
| Dynamic Viscosity (25°C) | 7.8 µPa·s |
| Thermal Properties | Metric |
| Melting Point | -185.3 °C |
| Boiling Point | -47.6 °C |
| Thermal Conductivity (25°C) | 0.014 W/m·K |
| Specific Heat Capacity (Cp) | 1528 J/kg·K |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 92 °C |
| Critical Pressure (Pc) | 4.62 MPa |
| Critical Density (ρc) | 233 kg/m3 |
| Electrical Properties | Metric |
| Relative Permittivity (εr) | 1.00228 |
| Hazardous Data | Metric |
| Autoignition Temperature | 460 °C |
| Lower Flammability Limit | 2% |
| Upper Flammability Limit | 11% |
| NFPA Rating (Health) | 1 |
| NFPA Rating (Fire) | 4 |
| NFPA Rating (Reactivity) | 1 |
Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)
Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Netherlands: Elsevier Science, 2015. 4) Fire Protection Guide to Hazardous Materials, 14th Edition. United States: National Fire Protection Association, 2010.