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      Acetylene
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      Acetylene
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      C2H2
      Acetylene

      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
        26.037
        g/mol
      • Content in dry air
        /

      Critical Point

      • Temperature
        35.15
        °C
         95.27 °F 308.3 K
      • Pressure
        61.38
        bar
         6.138E6 pa 890.2413 lbf/in2 60.5774 Atm 6138 Kpa 4.6039E4 mmHg
      • Density
        232.48
        kg/m³
         14.5132 lb/ft³

      Triple Point

      • Temperature
        - 80.75
        °C
         - 113.35 °F 192.4 K
      • Pressure
        1.2745
        bar
         1.2745E5 pa 18.4843 lbf/in2 1.2578 Atm 127.445 Kpa 955.9188 mmHg
      Pressure 1.013 bar
      • Melting point
        - 80.75
        °C
         - 113.35 °F 192.4 K
      • Latent heat of fusion (at melting point)
        144.79
        kJ/kg
         62.2903 Btu/lb 34.6056 kcal/kg
      • Solid density
        /
      Pressure 1.013 bar
      • Liquid density (at sublimation point)
        622.723
        kg/m³
         38.8752 lb/ft³
      • Boiling point (sublimation point)
        - 84.7
        °C
         - 120.46 °F 188.45 K
      • Latent heat of vaporization (at boiling point)
        /
      Pressure1.013barTemperature
      • Compressibility factor Z
        /
        /
        /
      • Cp/Cv ratio γ
        /
        /
        /
      • Dynamic viscosity
        9.3603E-5
        Po
         9.3603 µPa.s 9.3603E-6 PA.S 6.2898E-6 lb/ft/s
        9.8768E-5
        Po
         9.8768 µPa.s 9.8768E-6 PA.S 6.6369E-6 lb/ft/s
        1.0217E-4
        Po
         10.2174 µPa.s 1.0217E-5 PA.S 6.8658E-6 lb/ft/s
      • Gas density at boiling point
        /
        /
        /
      • Gas density
        /
        /
        /
      • Heat capacity at constant pressure Cp
        /
        /
        1.6913
        kJ/(kg.K)
         4.0422E-1 BTU/lb∙°F 1691.266 J/kg∙K 4.0422E-1 kcal/kg∙K
      • Heat capacity at constant volume Cv
        /
        /
        /
      • Liquid (at boiling point)/gas equivalent
        /
        /
        /
      • Solubility in water
        /
        /
        /
      • Specific gravity
        /
        /
        /
      • Specific volume
        /
        /
        /
      • Thermal conductivity
        19.298
        mW/m∙K
         1.1158E-2 Btu/ft/h/°F 1.6604E-1 cal/hour∙cm∙°C 4.6123E-5 cal/s∙cm∙°C 1.9298E-2 W/(m∙K)
        20.976
        mW/m∙K
         1.2128E-2 Btu/ft/h/°F 1.8048E-1 cal/hour∙cm∙°C 5.0134E-5 cal/s∙cm∙°C 2.0976E-2 W/(m∙K)
        22.094
        mW/m∙K
         1.2774E-2 Btu/ft/h/°F 1.901E-1 cal/hour∙cm∙°C 5.2806E-5 cal/s∙cm∙°C 2.2094E-2 W/(m∙K)
      • Vapor pressure
        26.4968
        bar
         2.6497E6 pa 384.3034 lbf/in2 26.1503 Atm 2649.68 Kpa 1.9874E4 mmHg
        38.5665
        bar
         3.8567E6 pa 559.3596 lbf/in2 38.0622 Atm 3856.65 Kpa 2.8927E4 mmHg
        48.7024
        bar
         4.8702E6 pa 706.3683 lbf/in2 48.0655 Atm 4870.24 Kpa 3.653E4 mmHg
      return
      C2H2
      Acetylene

      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

      in standard conditions (1,013 bar, 15°C)

      m3(Volume)
      kg(Mass)
      Retour
      C2H2
      Acetylene

      Applications

      Examples of uses of this molecule in Industry and Healthcare

      Professionnals & Craftsmen

      Acetylene is used for localized or manual operations such as welding, brazing, cutting, straightening or heating.

      Professionnals & Craftsmen

      Electronic components

      Acetylene is used as precursor for amorphous carbon hard mask in Plasma-Enhanced Chemical Vapor Deposition (PECVD). It also is a carbon source in some silicon carbo-nitride films.

      Electronic components

      Glass

      Acetylene is used to lubricate the molds used in glass bottle manufacturing processes. A layer of fine soot is applied onto the glass mold, so that the glass article can be easily separated from the mold after cooling down.

      Glass

      Hospital care

      Acetylene is a component of a gaseous mixture used for pulmonary function diagnosis test.

      Hospital care

      Laboratories & Research Centers

      Acetylene is used as fuel gas in atomic absorption spectrophotometry.

      Laboratories & Research Centers
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      C2H2
      Acetylene

      Safety & Compatibility

      Information to safely use this molecule

      • Major hazards
      • Material compatibility
      Safety
      • GHS02
        Flammable
      • GHS04
        Gas under pressure

      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
          305
          °C
           581 °F 578.15 K
        • Flash point
          /
        • Lower flammability limit
          /
        • Upper flammability limit (due to the decomposition)
          /

      • US (according to NFPA for Limits and ASTM E659 for autoignition temperature)

        • Auto-ignition temperature
          305
          °C
           581 °F 578.15 K
        • Flash point
          /
        • Lower flammability limit
          /
        • Upper flammability limit (due to the decomposition)
          /

      Odor

      Garlic like

      Metals

      • Aluminium
        Satisfactory
      • Brass
        Not recommended
        non recommended if >65% cooper
      • 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
        Satisfactory
      • Ethylene tetrafluoroethylene
        Satisfactory
      • Polycarbonate
        Acceptable
        be careful with the solvent used to packaged
      • Polyamide
        Acceptable
        significant loss of mass and be careful with impurities
      • Polypropylene
        Satisfactory

      Elastomers

      • Buthyl (isobutene- isoprene) rubber
        Satisfactory
      • Nitrile rubber NBR
        Not recommended
        significant loss of mass and be careful with impurities
      • Chloroprene
        Not recommended
        significant loss of mass and be careful with impurities
      • Silicone
        Not recommended
        significant loss of mass and be careful with impurities
      • Perfluoroelastomers
        Satisfactory
      • Fluoroelastomers
        Not recommended
        significant loss of mass and be careful with impurities
      • Neoprene
        Satisfactory
        be careful with the solvent used to packaged
      • Polyurethane
        Not recommended
        significant loss of mass and be careful with impurities
      • Ethylene-Propylene
        Satisfactory

      Lubricants

      • Hydrocarbon based lubricant
        Not recommended
        significant loss of mass and be careful with impurities
      • Fluorocarbon based lubricant
        Not recommended
        significant loss of mass and be careful with impurities

      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.

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      C2H2
      Acetylene

      Learn More

      General information

      More information

      Acetylene was discovered in 1836 by Sir Edmund Davy. Acetylene is a synthesis gas generally produced from the reaction of calcium carbide with water. It used to be burnt in "acetylene lamps" to light homes and mining tunnels in the 19th century. It is colorless, unstable, highly combustible and has a strong garlic odor. It produces a very hot flame (over 3000 °C or 5400 °F) when combined with oxygen. It has been widely used for oxy-cutting and welding metal materials until it was remplaced by arc-based welding processes using argon.

      C2H2

      Acetylene