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      Sulfur dioxide
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      Sulfur dioxide
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      SO2
      Sulfur dioxide

      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
        64.064
        g/mol
      • Content in dry air
        /

      Critical Point

      • Temperature
        157.6
        °C
         315.68 °F 430.75 K
      • Pressure
        78.841
        bar
         7.8841E6 pa 1143.4916 lbf/in2 77.81 Atm 7884.1 Kpa 5.9136E4 mmHg
      • Density
        525.11
        kg/m³
         32.7815 lb/ft³

      Triple Point

      • Temperature
        - 75.45
        °C
         - 103.81 °F 197.7 K
      • Pressure
        1.6744E-2
        bar
         1674.39 pa 2.4285E-1 lbf/in2 1.6525E-2 Atm 1.6744 Kpa 12.559 mmHg
      Pressure 1.013 bar
      • Melting point
        - 73.15
        °C
         - 99.67 °F 200 K
      • Latent heat of fusion (at melting point)
        115.525
        kJ/kg
         49.7001 Btu/lb 27.6111 kcal/kg
      • Solid density
        /
      Pressure 1.013 bar
      • Liquid density (at boiling point)
        1461.1
        kg/m³
         91.2133 lb/ft³
      • Boiling point
        - 10.02
        °C
         13.964 °F 263.13 K
      • Latent heat of vaporization (at boiling point)
        389.06
        kJ/kg
         167.3779 Btu/lb 92.9876 kcal/kg
      Pressure1.013barTemperature
      • Compressibility factor Z
        9.7509E-1
        9.8025E-1
        9.8285E-1
      • Cp/Cv ratio γ
        1.2966
        1.2863
        1.2805
      • Dynamic viscosity
        1.1796E-4
        Po
         11.7955 µPa.s 1.1796E-5 PA.S 7.9262E-6 lb/ft/s
        1.2475E-4
        Po
         12.4747 µPa.s 1.2475E-5 PA.S 8.3826E-6 lb/ft/s
        1.2924E-4
        Po
         12.9238 µPa.s 1.2924E-5 PA.S 8.6844E-6 lb/ft/s
      • Gas density at boiling point
        3.057
        kg/m³
         1.9084E-1 lb/ft³
        3.057
        kg/m³
         1.9084E-1 lb/ft³
        3.057
        kg/m³
         1.9084E-1 lb/ft³
      • Gas density
        2.9305
        kg/m³
         1.8294E-1 lb/ft³
        2.7633
        kg/m³
         1.7251E-1 lb/ft³
        2.6636
        kg/m³
         1.6628E-1 lb/ft³
      • Heat capacity at constant pressure Cp
        6.6921E-1
        kJ/(kg.K)
         1.5994E-1 BTU/lb∙°F 669.206 J/kg∙K 1.5994E-1 kcal/kg∙K
        6.5898E-1
        kJ/(kg.K)
         1.575E-1 BTU/lb∙°F 658.982 J/kg∙K 1.575E-1 kcal/kg∙K
        6.562E-1
        kJ/(kg.K)
         1.5684E-1 BTU/lb∙°F 656.203 J/kg∙K 1.5684E-1 kcal/kg∙K
      • Heat capacity at constant volume Cv
        5.1614E-1
        kJ/(kg.K)
         1.2336E-1 BTU/lb∙°F 516.14 J/kg∙K 1.2336E-1 kcal/kg∙K
        5.123E-1
        kJ/(kg.K)
         1.2244E-1 BTU/lb∙°F 512.3 J/kg∙K 1.2244E-1 kcal/kg∙K
        5.1246E-1
        kJ/(kg.K)
         1.2248E-1 BTU/lb∙°F 512.456 J/kg∙K 1.2248E-1 kcal/kg∙K
      • Liquid (at boiling point)/gas equivalent
        498.58
        mol/mol
        528.75
        mol/mol
        548.54
        mol/mol
      • Solubility in water
        /
        3.45E-2
        mol/mol
        2.46E-2
        mol/mol
      • Specific gravity
        2.26
        2.26
        2.26
      • Specific volume
        3.412E-1
        m³/kg
         5.4655 ft³/lb
        3.619E-1
        m³/kg
         5.7971 ft³/lb
        3.754E-1
        m³/kg
         6.0133 ft³/lb
      • Thermal conductivity
        8.434
        mW/m∙K
         4.8763E-3 Btu/ft/h/°F 7.2568E-2 cal/hour∙cm∙°C 2.0158E-5 cal/s∙cm∙°C 8.434E-3 W/(m∙K)
        9.092
        mW/m∙K
         5.2568E-3 Btu/ft/h/°F 7.823E-2 cal/hour∙cm∙°C 2.173E-5 cal/s∙cm∙°C 9.092E-3 W/(m∙K)
        9.54
        mW/m∙K
         5.5158E-3 Btu/ft/h/°F 8.2084E-2 cal/hour∙cm∙°C 2.2801E-5 cal/s∙cm∙°C 9.54E-3 W/(m∙K)
      • Vapor pressure
        1.5637
        bar
         1.5637E5 pa 22.6795 lbf/in2 1.5433 Atm 156.37 Kpa 1172.8747 mmHg
        2.8104
        bar
         2.8104E5 pa 40.7614 lbf/in2 2.7736 Atm 281.04 Kpa 2107.9792 mmHg
        4.0015
        bar
         4.0015E5 pa 58.0368 lbf/in2 3.9492 Atm 400.15 Kpa 3001.3801 mmHg
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      SO2
      Sulfur dioxide

      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)
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      SO2
      Sulfur dioxide

      Applications

      Examples of uses of this molecule in Industry and Healthcare

      Beverage

      Sulfur dioxide allows to preserve wines from microbes or further oxidation during winemaking.

      Beverage

      Food

      Sulfur dioxide is used to preserve, fumigate and bleach grain.

      Food

      Laboratories & Research Centers

      Sulfur dioxide is used in calibration gas mixtures for petrochemical industry, environmental emission monitoring, industrial hygiene monitors and trace impurity analyzers.

      Laboratories & Research Centers

      Other

      Sulfur dioxide is used as a flotation depressant for sulfide ores in the mining industry.

      Electronic components

      Sulfur dioxide is used as an additive to etching gas mixtures.

      Electronic components

      Pulp & Paper

      Sulfur dioxide is used to bleach paper pulp.

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      SO2
      Sulfur dioxide

      Safety & Compatibility

      Information to safely use this molecule

      • Major hazards
      • Material compatibility
      Safety
      • GHS04
        Gas under pressure
      • GHS05
        Corrosive
      • GHS06
        Acute Toxicity

      Threshold of toxicity

      • VME
        2
        ppm
         or 5
        mg/m3
      • VLE
        5
        ppm
         or 10
        mg/m3
      • ILV-8h
        /
      • ILV 15mn
        /
      • TLV-TWA (USA)
        2
        ppm
         2 ppm 2.E-4 vol% 2.E-6 vol/vol
      • TLV-STEL (USA)
        5
        ppm
         5 ppm 5.E-4 vol% 5.E-6 vol/vol

      Odor

      Pungent and irritating

      Metals

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

      Plastics

      • Polytetrafluoroethylene
        Satisfactory
      • Polychlorotrifluoroethylene
        Satisfactory
      • Polyvinylidene fluoride
        Satisfactory
      • Polyvinyl chloride
        Not recommended
        significant loss of mass
      • Ethylene tetrafluoroethylene
        Satisfactory
      • Polycarbonate
        Not recommended
      • Polyamide
        Not recommended
        significant loss of mass
      • Polypropylene
        Satisfactory

      Elastomers

      • Buthyl (isobutene- isoprene) rubber
        Satisfactory
      • Nitrile rubber NBR
        Not recommended
        significant loss of mass
      • Chloroprene
        Not recommended
        significant loss of mass
      • Silicon
        Not recommended
        significant loss of mass
      • Perfluoroelastomers
        Satisfactory
      • Fluoroelastomers
        Not recommended
        significant loss of mass
      • Neoprene
        Not recommended
      • Polyurethane
        Satisfactory
      • Ethylene-Propylene
        Satisfactory

      Lubricants

      • Hydrocarbon based lubricant
        Not recommended
        significant loss of mass
      • Fluorocarbon based lubricant
        Not recommended
        material contamination

      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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      SO2
      Sulfur dioxide

      Learn More

      General information

      More information

      Sulfur dioxide is a noticeable component in the atmosphere, especially following volcanic eruptions.

      SO2

      Sulfur dioxide