Properties of Boron Trifluoride (BF3)

Boron trifluoride (BF3) is a chemical compound composed of one boron atom and three fluorine atoms. It is a colorless, toxic gas at room temperature and is commonly used as a Lewis acid in various chemical reactions, such as in organic synthesis and polymerization processes.

The following table provides a comprehensive list of boron trifluoride 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 Boron Trifluoride Properties
Physical Properties
Metric
Molar Mass67.806 g/mol
Density (25°C)4.789 kg/m3
Dynamic Viscosity (25°C)17.1 µPa·s
Thermal PropertiesMetric
Melting Point-126.8 °C
Boiling Point-99.9 °C
Thermal Conductivity (25°C)0.019 W/m·K
Specific Heat Capacity (Cp)744 J/kg·K
Critical ConstantsMetric
Critical Temperature (Tc)-12.25 °C
Critical Pressure (Pc)4.985 MPa
Critical Density (ρc)549 kg/m3
Electrical PropertiesMetric
Relative Permittivity (εr)1.0011
Optical PropertiesMetric
Refractive Index (589 nm)1.000379
Hazardous DataMetric
NFPA Rating (Health)4
NFPA Rating (Fire)0
NFPA Rating (Reactivity)0

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.