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Ethylene
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Ethylene
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C2H4
Ethylene

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
    28.05
    g/mol
  • Content in air
    /

Critical Point

  • Temperature
    9.2
    °C
    48.56 °F 282.35 K
  • Pressure
    50.42
    bar
    5.042E6 pa 731.28 lbf/in2 49.7607 Atm 5042 Kpa 3.7818E4 mmHg
  • Density
    214.2
    kg/m³
    13.372 lb/ft³

Triple Point

  • Temperature
    - 169.16
    °C
    - 272.488 °F 103.99 K
  • Pressure
    1.22E-3
    bar
    122 pa 1.7695E-2 lbf/in2 1.204E-3 Atm 1.22E-1 Kpa 9.1508E-1 mmHg
Pressure 1.013 bar
  • Melting point
    - 169.15
    °C
    - 272.47 °F 104 K
  • Latent heat of fusion (at melting point)
    119.45
    kJ/kg
    51.3887 Btu/lb 28.5492 kcal/kg
  • Solid density
    /
Pressure 1.013 bar
  • Liquid density
    567.65
    kg/m³
    35.4372 lb/ft³
  • Boiling point
    - 103.77
    °C
    - 154.786 °F 169.38 K
  • Latent heat of vaporization (at boiling point)
    482.41
    kJ/kg
    207.5382 Btu/lb 115.2988 kcal/kg
Pressure1.013barTemperature
  • Compressibility factor Z
    9.9247E-1
    9.9361E-1
    9.9426E-1
  • Cp/Cv ratio γ
    1.2651
    1.2535
    1.2461
  • Dynamic viscosity
    9.4697E-5
    Po
    9.4697 µPa.s 9.4697E-6 PA.S 6.3634E-6 lb/ft/s
    9.98E-5
    Po
    9.98 µPa.s 9.98E-6 PA.S 6.7063E-6 lb/ft/s
    1.0318E-4
    Po
    10.318 µPa.s 1.0318E-5 PA.S 6.9334E-6 lb/ft/s
  • Gas density at boiling point
    2.088
    kg/m³
    1.3035E-1 lb/ft³
    2.088
    kg/m³
    1.3035E-1 lb/ft³
    2.088
    kg/m³
    1.3035E-1 lb/ft³
  • Gas density
    1.2608
    kg/m³
    7.8709E-2 lb/ft³
    1.1938
    kg/m³
    7.4526E-2 lb/ft³
    1.153
    kg/m³
    7.1979E-2 lb/ft³
  • Heat capacity at constant pressure Cp
    1.459
    kJ/(kg.K)
    3.487E-1 BTU/lb∙°F 1458.966 J/kg∙K 3.487E-1 kcal/kg∙K
    1.5048
    kJ/(kg.K)
    3.5966E-1 BTU/lb∙°F 1504.813 J/kg∙K 3.5966E-1 kcal/kg∙K
    1.5375
    kJ/(kg.K)
    3.6747E-1 BTU/lb∙°F 1537.504 J/kg∙K 3.6747E-1 kcal/kg∙K
  • Heat capacity at constant volume Cv
    1.1533
    kJ/(kg.K)
    2.7564E-1 BTU/lb∙°F 1153.262 J/kg∙K 2.7564E-1 kcal/kg∙K
    1.2008
    kJ/(kg.K)
    2.87E-1 BTU/lb∙°F 1200.82 J/kg∙K 2.87E-1 kcal/kg∙K
    1.2338
    kJ/(kg.K)
    2.9489E-1 BTU/lb∙°F 1233.832 J/kg∙K 2.9489E-1 kcal/kg∙K
  • Liquid (at boiling point)/gas equivalent
    450.23
    mol/mol
    475.5
    mol/mol
    492.32
    mol/mol
  • Solubility in water
    /
    /
    /
  • Specific gravity
    0.98
    0.98
    0.98
  • Specific volume
    7.932E-1
    m³/kg
    12.7058 ft³/lb
    8.377E-1
    m³/kg
    13.4187 ft³/lb
    8.676E-1
    m³/kg
    13.8976 ft³/lb
  • Thermal conductivity
    17.369
    mW/m∙K
    1.0042E-2 Btu/ft/h/°F 1.4945E-1 cal/hour∙cm∙°C 4.1513E-5 cal/s∙cm∙°C 1.7369E-2 W/(m∙K)
    19.099
    mW/m∙K
    1.1043E-2 Btu/ft/h/°F 1.6433E-1 cal/hour∙cm∙°C 4.5648E-5 cal/s∙cm∙°C 1.9099E-2 W/(m∙K)
    20.326
    mW/m∙K
    1.1752E-2 Btu/ft/h/°F 1.7489E-1 cal/hour∙cm∙°C 4.858E-5 cal/s∙cm∙°C 2.0326E-2 W/(m∙K)
  • Vapor pressure
    41.0148
    bar
    4.1015E6 pa 594.8691 lbf/in2 40.4785 Atm 4101.48 Kpa 3.0764E4 mmHg
    41.0148
    bar
    4.1015E6 pa 594.8691 lbf/in2 40.4785 Atm 4101.48 Kpa 3.0764E4 mmHg
    41.0148
    bar
    4.1015E6 pa 594.8691 lbf/in2 40.4785 Atm 4101.48 Kpa 3.0764E4 mmHg
C2H4
Ethylene

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)
C2H4
Ethylene

Applications

Examples of uses of this molecule in Industry and Healthcare

Chemicals

In term of quantity produced, ethylene is the most important organic chemical. Ethylene is the feedstock in the manufacture of the most important polymer: polyethylene. It is also converted to ethylene oxide, it is a precursor to ethylene glycol, ethylbenzene, styrene and to various kinds of polyethylene, to ethylene dichloride and to vinyl chloride.

Chemicals

Food

Ethylene is used to stimulate and regulate the ripening of various fruits, such as tomatoes and bananas.

Food

Metal fabrication

Ethylene is used in oxycutting.

Metal fabrication
C2H4
Ethylene

Safety

Information to safely use this molecule

  • Major hazards
  • Material compatibility
  • GHS02
    Flammable
  • GHS04
    Gas under pressure
  • GHS07
    Health hazards

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
      440
      °C
      824 °F 713.15 K
    • Flash point
      /
    • Lower flammability limit
      2.4
      vol/%
      2.4E4 ppm 2.4E4 ppm 2.4E-2 vol/vol
    • Upper flammability limit
      32.6
      vol/%
      3.26E5 ppm 3.26E5 ppm 3.26E-1 vol/vol
  • US (according to NFPA for Limits and ASTM E659 for autoignition temperature)

    • Auto-ignition temperature
      450
      °C
      842 °F 723.15 K
    • Flash point
      /
    • Lower flammability limit
      2.7
      vol/%
      2.7E4 ppm 2.7E4 ppm 2.7E-2 vol/vol
    • Upper flammability limit
      36
      vol/%
      3.6E5 ppm 3.6E5 ppm 0.36 vol/vol

Odor

Sweet

Metals

  • Aluminium
    Satisfactory
  • Brass
    Satisfactory
  • Monel
    Satisfactory
  • Copper
    Not recommended
  • Ferritic Steel
    Satisfactory
  • Stainless steel
    Satisfactory
  • Zinc
    Satisfactory
  • Titanium
    no data

Plastics

  • Polytetrafluoroethylene
    Satisfactory
  • Polychlorotrifluoroethylene
    Satisfactory
  • Polyvinylidene fluoride
    Satisfactory
  • Polyvinyl chloride
    no data
  • Ethylene tetrafluoroethylene
    Satisfactory
  • Polycarbonate
    no data
  • Polyamide
    Satisfactory
  • Polypropylene
    Satisfactory

Elastomers

  • Buthyl (isobutene- isoprene) rubber
    Satisfactory
  • Nitrile rubber
    no data
  • Chloroprene
    no data
  • Chlorofluorocarbons
    no data
  • Silicon
    no data
  • Perfluoroelastomers
    Satisfactory
  • Fluoroelastomers
    Satisfactory
  • Nitrile rubber
    Satisfactory
  • Neoprene
    Satisfactory
  • Polyurethane
    no data
  • Ethylene-Propylene
    no data

Lubricants

  • Hydrocarbon based lubricant
    Satisfactory
  • 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.

C2H4
Ethylene

Learn More

General information

More information

Ethylene activity as a plant hormon stimulating ripening was discovered in 1901 by a Russian scientist named Dimitry Neljubowas. However in Egypt and China, the principle has been used for thousands of years.