Compound Information 

Name: octafluoropropane
Formula: C3F8
Molar Mass: 188.0202256
Additional Names: R-218
perfluoropropane
freon 218
FC 218
genetron 218
propane, octafluoro-
Image of octafluoropropane

Please be patient while the web interface loads...

Property Availability 

For this compound, WTT contains critically evaluated recommendations for:
(Please note that if more than 50 points are used for regression, only the 50 most-constraining points are reported)

  • Triple point temperature
    • Triple point temperature (Crystal 1, Liquid, and Gas)
      3 experimental data points
    • Triple point temperature (Crystal 2, Crystal 1, and Gas)
      1 experimental data points
  • Normal boiling temperature (Liquid and Gas)
    • Critical temperature (Liquid and Gas)
      5 experimental data points
      • Critical pressure (Liquid and Gas)
        5 experimental data points
        • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
          Pressure from 0.00202278 kPa to 2640 kPa
          • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
            Temperature from 125.45 K to 345.02 K
            50 experimental data points
            • Critical density (Liquid and Gas)
              4 experimental data points
              • Density
                • Density (Liquid in equilibrium with Gas) as a function of Temperature
                  Temperature from 125.45 K to 345.02 K
                  50 experimental data points
                • Density (Gas in equilibrium with Liquid) as a function of Temperature
                  Temperature from 125.45 K to 345.02 K
                  31 experimental data points
                • Density (Gas) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 440 K
                  Pressure from 0.02 kPa to 2640 kPa
                  36 experimental data points
                • Density (Liquid) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 345.02 K
                  Pressure from 0.02 kPa to 20000 kPa
                  50 experimental data points
              • Isobaric coefficient of expansion
                • Isobaric coefficient of expansion (Liquid) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 345.02 K
                  Pressure from 0.02 kPa to 20000 kPa
                • Isobaric coefficient of expansion (Gas) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 440 K
                  Pressure from 0.02 kPa to 2640 kPa
              • Isothermal compressibility
                • Isothermal compressibility (Liquid) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 345.02 K
                  Pressure from 0.02 kPa to 20000 kPa
                • Isothermal compressibility (Gas) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 440 K
                  Pressure from 0.02 kPa to 2640 kPa
              • Thermal pressure coefficient
                • Thermal pressure coefficient (Liquid) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 345.02 K
                  Pressure from 0.02 kPa to 20000 kPa
                • Thermal pressure coefficient (Gas) as a function of Temperature and Pressure
                  Temperature from 125.45 K to 440 K
                  Pressure from 0.02 kPa to 2640 kPa
              • 2nd virial coefficient (Gas) as a function of Temperature
                Temperature from 125.45 K to 440 K
                2 experimental data points
                • 3rd virial coefficient (Gas) as a function of Temperature
                  Temperature from 125.45 K to 440 K
                  • Enthalpy of phase transition
                    • Enthalpy of phase transition (Crystal 1 to Liquid in equilibrium with Gas)
                      1 experimental data points
                    • Enthalpy of phase transition (Crystal 2 to Crystal 1 in equilibrium with Gas)
                      1 experimental data points
                  • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
                    Temperature from 125.45 K to 345.02 K
                    1 experimental data points
                    • Heat capacity at saturation pressure
                      • Heat capacity at saturation pressure (Crystal 2 in equilibrium with Gas) as a function of Temperature
                        Temperature from 0.0001 K to 99.3881 K
                        50 experimental data points
                      • Heat capacity at saturation pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
                        Temperature from 99.3882 K to 125.46 K
                        21 experimental data points
                      • Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature
                        Temperature from 125.45 K to 344.9 K
                        45 experimental data points
                    • Heat capacity at constant pressure
                      • Heat capacity at constant pressure (Liquid) as a function of Temperature and Pressure
                        Temperature from 125.45 K to 345.02 K
                        Pressure from 0.02 kPa to 20000 kPa
                        32 experimental data points
                      • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                        Temperature from 200 K to 1500 K
                      • Heat capacity at constant pressure (Gas) as a function of Temperature and Pressure
                        Temperature from 125.45 K to 440 K
                        Pressure from 0.02 kPa to 2640 kPa
                        12 experimental data points
                    • Enthalpy
                      • Enthalpy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                        Temperature from 0.0001 K to 99.3881 K
                      • Enthalpy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                        Temperature from 99.3882 K to 125.46 K
                      • Enthalpy (Liquid in equilibrium with Gas) as a function of Temperature
                        Temperature from 125.461 K to 338.128 K
                      • Enthalpy (Ideal Gas) as a function of Temperature
                        Temperature from 200 K to 1500 K
                    • Entropy
                      • Entropy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                        Temperature from 0.0001 K to 99.3881 K
                      • Entropy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                        Temperature from 99.3882 K to 125.46 K
                      • Entropy (Liquid in equilibrium with Gas) as a function of Temperature
                        Temperature from 125.45 K to 345.02 K
                      • Entropy (Ideal Gas) as a function of Temperature and Pressure
                        Temperature from 200 K to 1500 K
                    • Adiabatic compressibility
                      • Adiabatic compressibility (Liquid) as a function of Temperature and Pressure
                        Temperature from 125.45 K to 345.02 K
                        Pressure from 0.02 kPa to 20000 kPa
                      • Adiabatic compressibility (Gas) as a function of Temperature and Pressure
                        Temperature from 125.45 K to 440 K
                        Pressure from 0.02 kPa to 2640 kPa
                    • Pressure coefficient of enthalpy (Liquid) as a function of Temperature and Pressure
                      Temperature from 125.45 K to 345.02 K
                      Pressure from 0.02 kPa to 20000 kPa
                      • Joule-Thomson coefficient (Gas) as a function of Temperature and Pressure
                        Temperature from 125.45 K to 440 K
                        Pressure from 0.02 kPa to 2640 kPa
                        • Speed of sound
                          • Speed of sound (Gas) as a function of Temperature and Pressure
                            Temperature from 125.45 K to 440 K
                            Pressure from 0.02 kPa to 2640 kPa
                            50 experimental data points
                          • Speed of sound (Liquid) as a function of Temperature and Pressure
                            Temperature from 125.45 K to 345.02 K
                            Pressure from 0.02 kPa to 20000 kPa
                            50 experimental data points
                          • Speed of sound (Liquid in equilibrium with Gas) as a function of Temperature
                            Temperature from 125.45 K to 345.02 K
                          • Speed of sound (Gas in equilibrium with Liquid) as a function of Temperature
                            Temperature from 125.45 K to 345.02 K
                        • Surface tension (Liquid in equilibrium with Gas) as a function of Temperature
                          Temperature from 125.45 K to 345.02 K
                          41 experimental data points
                          • Viscosity
                            • Viscosity (Liquid) as a function of Temperature and Pressure
                              Temperature from 125.45 K to 345.019 K
                              Pressure from 0.02 kPa to 20000 kPa
                              306 experimental data points
                            • Viscosity (Gas) as a function of Temperature and Pressure
                              Temperature from 125.45 K to 440 K
                              Pressure from 0.02 kPa to 2640 kPa
                              42 experimental data points
                            • Viscosity (Liquid in equilibrium with Gas) as a function of Temperature
                              Temperature from 125.45 K to 344.9 K
                              4 experimental data points
                          • Thermal conductivity
                            • Thermal conductivity (Gas) as a function of Temperature and Pressure
                              Temperature from 125.45 K to 440 K
                              Pressure from 0.02 kPa to 2640 kPa
                              116 experimental data points
                            • Thermal conductivity (Liquid in equilibrium with Gas) as a function of Temperature
                              Temperature from 125.45 K to 344.9 K
                              23 experimental data points
                            • Thermal conductivity (Liquid) as a function of Temperature and Pressure
                              Temperature from 125.45 K to 345.019 K
                              Pressure from 0.02 kPa to 20000 kPa
                              84 experimental data points

                          About WTT 

                          NIST/TRC Web Thermo Tables (WTT)
                          NIST Standard Reference Subscription Database 3 - Professional Edition
                          Version 2-2012-1-Pro

                          This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. These data were generated through dynamic data analysis, as implemented in the NIST ThermoData Engine software package [1, 2, 3, 4, 5, 6]. Some critically evaluated data from the historical TRC Thermodynamic Tables archive [7, 8] are included, also. As of May 2012, the Professional Edition contains information on 28432 compounds and total of 531486 evaluated data points. The properties covered by both versions (32 total) are described in Properties and Implemented Models.

                          Developed by Kenneth Kroenlein, Chris D. Muzny, Andrei F. Kazakov, Vladimir Diky, Robert D. Chirico, Joseph W. Magee, Ilmutdin Abdulagatov and Michael Frenkel.

                          Thermodynamics Research Center (TRC)
                          Thermophysical Properties Division
                          National Institute of Standards and Technology
                          Boulder CO 80305-3337

                          Questions and comments should be addressed to Dr. Michael Frenkel .

                          DISCLAIMER: The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high-quality copy of the database and to verify that the methods and data contained therein have been selected on the basis of sound scientific judgement. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the program and database.

                          Distributed by:
                          Standard Reference Data Program
                          National Institute of Standards and Technology
                          Gaithersburg MD 20899

                          Compound Information
                          Property Availability
                          About this site
                          NIST Chemistry WebBook