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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 air
    /

Critical Point

  • Temperature
    157.49
    °C
    315.482 °F 430.64 K
  • Pressure
    78.84
    bar
    7.884E6 pa 1143.4771 lbf/in2 77.809 Atm 7884 Kpa 5.9135E4 mmHg
  • Density
    525
    kg/m³
    32.7746 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
    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
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)
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.

SO2
Sulfur dioxide

Safety

Information to safely use this molecule

  • Major hazards
  • Material compatibility
  • 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
    Not recommended
  • Monel
    Satisfactory
  • Copper
    Not recommended
  • Ferritic Steel
    Satisfactory
  • Stainless steel
    Satisfactory
  • Zinc
    Not recommended
  • Titanium
    no data

Plastics

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

Elastomers

  • Buthyl (isobutene- isoprene) rubber
    no data
  • Nitrile rubber
    Not recommended
    significant loss of mass
  • Chloroprene
    Not recommended
    significant loss of mass
  • Chlorofluorocarbons
    Not recommended
    significant loss of mass
  • Silicon
    Not recommended
    significant loss of mass
  • Perfluoroelastomers
    Satisfactory
  • Perfluoroelastomers
    Satisfactory
  • Fluoroelastomers
    Satisfactory
  • Nitrile rubber
    Not recommended
  • Neoprene
    Not recommended
  • Polyurethane
    Satisfactory
  • Ethylene-Propylene
    Satisfactory

Lubricants

  • Hydrocarbon based lubricant
    Not recommended
    perte de masse importante et contamination du matériau
  • Fluorocarbon based lubricant
    Not recommended
    contamination du matériau

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.

SO2
Sulfur dioxide

Learn More

General information

More information

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