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Properties of octamethylcyclotetrasiloxane

Thermophysical properties for octamethylcyclotetrasiloxane (CAS: 556-67-2). Use the selector below to view properties in different unit systems.

Calculation Conditions

The following state-dependent properties were calculated at these standard conditions.

Temperature

25 °C

Pressure

1.01325 bar

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Identification

  • Atoms
    C: 8, H: 24, O: 4, Si: 4
  • CAS
    556-67-2
  • Formula
    C8H24O4Si4
  • ID
    556-67-2
  • InChI
    C8H24O4Si4/c1-13(2)9-14(3,4)11-16(7,8)12-15(5,6)10-13/h1-8H3
  • InChI Key
    HMMGMWAXVFQUOA-UHFFFAOYSA-N
  • IUPAC Name
    2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
  • Molecular Weight (kg)
    296.616
  • Phase
    l
  • PubChem ID
    1.1169e+4
  • SMILES
    C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C
  • Synonyms

Physical Properties

  • Acentric factor
    0.598
  • Critical pressure (bar)
    13.472
  • Critical temperature (°C)
    313.35
  • Critical volume (m³/kmol)
    0.958773
  • Dipole moment
  • Melting temperature (°C)
    17.5
  • Normal boiling temperature (°C)
    175.741

State-dependent Properties

  • API gravity
    15.5028
  • Compressibility factor
    0.0127504
  • Density (kg/m³)
    950.865
  • Dynamic viscosity (cP)
    2.21958
  • Enthalpy of vaporization (mass) (kJ)
    185.533
  • Enthalpy of vaporization (molar) (kJ/kmol)
    5.5032e+4
  • Gibbs free energy (kJ/kmol)
    0
  • Joule–Thomson coefficient
    -4.0434e-7
  • Kinematic viscosity
    2.3343e-6
  • Molar enthalpy (kJ/kmol)
    0
  • Molar entropy (kJ/(kmol·K))
    0
  • Molar heat capacity (kJ/(kmol·K))
    495.682
  • Molar volume (m³/kmol)
    0.311943
  • Parachor
    1.1577e-4
  • Poynting correction factor
    1.01281
  • Prandtl number
    32.9475
  • Saturation pressure (bar)
    0.00134381
  • Saturation temperature (°C)
    175.741
  • Solubility parameter
    1.2980e+4
  • Specific enthalpy (kJ)
    0
  • Specific entropy (kJ/kg·K)
    0
  • Specific gravity
    0.951801
  • Specific heat capacity (kJ/kg·K)
    1.67113
  • Surface tension
    0.018022
  • Thermal conductivity
    0.112579
  • Thermal diffusivity
    7.0848e-8

Safety Properties

  • Autoignition temperature (°C)
    -273.15
  • Flash point temperature (°C)
    48.343
  • Lower flammability limit
    0.00946318
  • Upper flammability limit
    0.0602202

Environmental Properties

  • Global warming potential
    2.66
  • Ozone depletion potential