Properties of Phosphine (PH3)

Phosphine is a chemical compound with the formula PH3. It is a colorless, flammable, and highly toxic gas with a pungent odor. It is used in various industrial applications, such as in the semiconductor industry and as a fumigant for stored grain.

The following table provides a comprehensive list of phosphine 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.

Table of Phosphine Properties
Physical Properties
Metric
Molar Mass33.998 g/mol
Density (25°C)1.379 kg/m3
Dynamic Viscosity (25°C)10.6 µPa·s
Thermal PropertiesMetric
Melting Point-133.8 °C
Boiling Point-87.8 °C
Thermal Conductivity (25°C)0.016 W/m·K
Specific Heat Capacity (Cp)1091 J/kg·K
Critical ConstantsMetric
Critical Temperature (Tc)51.5 °C
Critical Pressure (Pc)6.53 MPa
Critical Density (ρc)300 kg/m3
Hazardous DataMetric
Autoignition Temperature80 °C
Lower Flammability Limit1.6%
Upper Flammability Limit98%
NFPA Rating (Health)4
NFPA Rating (Fire)4
NFPA Rating (Reactivity)2

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)

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.