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Isobutane
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Isobutane
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C4H10
Isobutane

Physical Properties

Under solid (grey), liquid (blue) and vapor states (white) along the equilibrium curves

  • General properties
  • Solid phase
  • Liquid Phase
  • Gas Phase
(P)
log(P)
Download
  • Molecular weight
    58.122
    g/mol
  • Content in air
    /

Critical Point

  • Temperature
    134.66
    °C
    274.388 °F 407.81 K
  • Pressure
    36.29
    bar
    3.629E6 pa 526.3417 lbf/in2 35.8154 Atm 3629 Kpa 2.722E4 mmHg
  • Density
    225.5
    kg/m³
    14.0775 lb/ft³

Triple Point

  • Temperature
    - 159.42
    °C
    - 254.956 °F 113.73 K
  • Pressure
    1.206E-7
    bar
    1.206E-2 pa 1.7492E-6 lbf/in2 1.1902E-7 Atm 1.206E-5 Kpa 9.0458E-5 mmHg
Pressure 1.013 bar
  • Melting point
    - 159.61
    °C
    - 255.298 °F 113.54 K
  • Latent heat of fusion (at melting point)
    78.112
    kJ/kg
    33.6047 Btu/lb 18.6692 kcal/kg
  • Solid density
    /
Pressure 1.013 bar
  • Liquid density
    593.821
    kg/m³
    37.0709 lb/ft³
  • Boiling point
    - 11.75
    °C
    10.85 °F 261.4 K
  • Latent heat of vaporization (at boiling point)
    365.101
    kJ/kg
    157.0705 Btu/lb 87.2612 kcal/kg
Pressure1.013barTemperature
  • Compressibility factor Z
    9.6446E-1
    9.7035E-1
    9.7354E-1
  • Cp/Cv ratio γ
    1.1185
    1.11
    1.1052
  • Dynamic viscosity
    6.8759E-5
    Po
    6.8759 µPa.s 6.8759E-6 PA.S 4.6204E-6 lb/ft/s
    7.2505E-5
    Po
    7.2505 µPa.s 7.2505E-6 PA.S 4.8721E-6 lb/ft/s
    7.4978E-5
    Po
    7.4978 µPa.s 7.4978E-6 PA.S 5.0383E-6 lb/ft/s
  • Gas density at boiling point
    2.827
    kg/m³
    1.7648E-1 lb/ft³
    2.827
    kg/m³
    1.7648E-1 lb/ft³
    2.827
    kg/m³
    1.7648E-1 lb/ft³
  • Gas density
    2.688
    kg/m³
    1.6781E-1 lb/ft³
    2.5326
    kg/m³
    1.581E-1 lb/ft³
    2.4397
    kg/m³
    1.5231E-1 lb/ft³
  • Heat capacity at constant pressure Cp
    1.5902
    kJ/(kg.K)
    3.8007E-1 BTU/lb∙°F 1590.2 J/kg∙K 3.8007E-1 kcal/kg∙K
    1.6503
    kJ/(kg.K)
    3.9443E-1 BTU/lb∙°F 1650.3 J/kg∙K 3.9443E-1 kcal/kg∙K
    1.6923
    kJ/(kg.K)
    4.0447E-1 BTU/lb∙°F 1692.3 J/kg∙K 4.0447E-1 kcal/kg∙K
  • Heat capacity at constant volume Cv
    1.4218
    kJ/(kg.K)
    3.3982E-1 BTU/lb∙°F 1421.8 J/kg∙K 3.3982E-1 kcal/kg∙K
    1.4867
    kJ/(kg.K)
    3.5533E-1 BTU/lb∙°F 1486.7 J/kg∙K 3.5533E-1 kcal/kg∙K
    1.5312
    kJ/(kg.K)
    3.6597E-1 BTU/lb∙°F 1531.2 J/kg∙K 3.6597E-1 kcal/kg∙K
  • Liquid (at boiling point)/gas equivalent
    220.92
    mol/mol
    234.47
    mol/mol
    243.4
    mol/mol
  • Solubility in water
    /
    2.333E-5
    mol/mol
    4.659E-5
    mol/mol
  • Specific gravity
    /
    /
    /
  • Specific volume
    3.72E-1
    m³/kg
    5.9589 ft³/lb
    3.949E-1
    m³/kg
    6.3257 ft³/lb
    4.099E-1
    m³/kg
    6.566 ft³/lb
  • Thermal conductivity
    14.343
    mW/m∙K
    8.2928E-3 Btu/ft/h/°F 1.2341E-1 cal/hour∙cm∙°C 3.4281E-5 cal/s∙cm∙°C 1.4343E-2 W/(m∙K)
    15.85
    mW/m∙K
    9.1641E-3 Btu/ft/h/°F 1.3638E-1 cal/hour∙cm∙°C 3.7882E-5 cal/s∙cm∙°C 1.585E-2 W/(m∙K)
    16.887
    mW/m∙K
    9.7636E-3 Btu/ft/h/°F 1.453E-1 cal/hour∙cm∙°C 4.0361E-5 cal/s∙cm∙°C 1.6887E-2 W/(m∙K)
  • Vapor pressure
    1.577
    bar
    1.577E5 pa 22.8724 lbf/in2 1.5564 Atm 157.7 Kpa 1182.8505 mmHg
    2.598
    bar
    2.598E5 pa 37.6808 lbf/in2 2.564 Atm 259.8 Kpa 1948.6656 mmHg
    3.512
    bar
    3.512E5 pa 50.9372 lbf/in2 3.4661 Atm 351.2 Kpa 2634.2239 mmHg
C4H10
Isobutane

Liquid / Gas Volumes

Calculate a liquid or gas volume or a mass

Liquid Phase

At boiling point at 1.013 bar

m3(Volume)
kg(Mass)

Gas Phase

at 1.013 bar and boiling point

m3(Volume)
kg(Mass)
C4H10
Isobutane

Applications

Examples of uses of this molecule in Industry and Healthcare

Laboratories & Research Centers

In mixture with argon, isobutane is used in Geiger counter and for the detector in X ray fluorescence as quentching gas. Isobutane is also used as reagent gas in chemical ionization mass spectrometry. In mixture with other hydrocarbons, isobutane is used as reference point in calorimetric measurements for the measurement of PCI of hydrocarbons or coal. Isobutane is used in calibration gas mixtures for petrochemical industry, environmental emission monitoring, industrial hygiene monitors and trace impurity analyzers.

Laboratories & Research Centers

Other

Isobutane is used as a propellant, a solvent or a refrigerant.

C4H10
Isobutane

Safety

Information to safely use this molecule

  • Major hazards
  • Material compatibility

Autoignition Temperature in Air at Patm and Flammability Limits in Air at Patm and 293.15 K (except if the temperature is indicated)

  • Europe (according to EN1839 for Limits and EN 14522 for autoignition temperature)

    • Auto-ignition temperature
      460
      °C
      860 °F 733.15 K
    • Flash point
      /
    • Lower flammability limit
      1.5
      vol/%
      1.5E4 ppm 1.5E4 ppm 1.5E-2 vol/vol
    • Upper flammability limit
      9.4
      vol/%
      9.4E4 ppm 9.4E4 ppm 9.4E-2 vol/vol
  • US (according to NFPA for Limits and ASTM E659 for autoignition temperature)

    • Auto-ignition temperature
      460
      °C
      860 °F 733.15 K
    • Flash point
      /
    • Lower flammability limit
      1.8
      vol/%
      1.8E4 ppm 1.8E4 ppm 1.8E-2 vol/vol
    • Upper flammability limit
      8.4
      vol/%
      8.4E4 ppm 8.4E4 ppm 8.4E-2 vol/vol

Threshold of toxicity

  • VME
    /
  • VLE
    /
  • ILV-8h
    /
  • ILV 15mn
    /
  • TLV-TWA (USA)
    800
    ppm
    800 ppm 0.08 vol/% 8.E-4 vol/vol
  • TLV-STEL (USA)
    /

Metals

  • Aluminium
    Satisfactory
  • Brass
    Satisfactory
  • Monel
    Satisfactory
  • Copper
    Satisfactory
  • Ferritic Steel
    Satisfactory
  • Stainless steel
    Satisfactory
  • Zinc
    Satisfactory
  • Titanium
    no data

Plastics

  • Polytetrafluoroethylene
    Satisfactory
  • Polychlorotrifluoroethylene
    Satisfactory
  • Polyvinylidene fluoride
    Satisfactory
  • Polyvinyl chloride
    Satisfactory
  • Ethylene tetrafluoroethylene
    Satisfactory
  • Polycarbonate
    Not recommended
  • Polyamide
    Satisfactory
  • Polypropylene
    Satisfactory

Elastomers

  • Buthyl (isobutene- isoprene) rubber
    Not recommended
    significant swelling
  • Nitrile rubber
    Satisfactory
  • Chloroprene
    Satisfactory
  • Chlorofluorocarbons
    Satisfactory
  • Silicon
    Not recommended
    significant swelling and modification of the properties of the material
  • Perfluoroelastomers
    Satisfactory
  • Fluoroelastomers
    Satisfactory
  • Nitrile rubber
    Satisfactory
  • Neoprene
    Satisfactory
  • Polyurethane
    Satisfactory
  • Ethylene-Propylene
    Not recommended
    significant swelling and modification of the properties of the material

Lubricants

  • Hydrocarbon based lubricant
    Not recommended
    significant loss of mass
  • Fluorocarbon based lubricant
    Satisfactory

Materials compatibility

Recommendations : Air Liquide has gathered data on the compatibility of gases with materials to assist you in evaluating which materials to use for a gas system. Although the information has been compiled from what Air Liquide believes are reliable sources (International Standards: Compatibility of cylinder and valve materials with gas content; Part 1- Metallic materials: ISO11114-1 (March 2012), Part 2 - Non-metallic materials: ISO11114-2 (April 2013), it must be used with extreme caution and engineering judgement. No raw data such as these can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table is only used to identify possible materials for applications at high pressure and ambient temperature. Extensive investigation and testing under the specific conditions of use need to be carried out to validate a material selection for a given application. Contact the regional Air Liquide team for expertise service.

C4H10
Isobutane

Learn More

General information