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Properties of octasiloxane, octadecamethyl-

Thermophysical properties for octasiloxane, octadecamethyl- (CAS: 556-69-4). 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: 18, H: 54, O: 7, Si: 8
  • CAS
    556-69-4
  • Formula
    C18H54O7Si8
  • ID
    556-69-4
  • InChI
    C18H54O7Si8/c1-26(2,3)19-28(7,8)21-30(11,12)23-32(15,16)25-33(17,18)24-31(13,14)22-29(9,10)20-27(4,5)6/h1-18H3
  • InChI Key
    VWGDPBQTSZDFMX-UHFFFAOYSA-N
  • IUPAC Name
    [dimethyl(trimethylsilyloxy)silyl]oxy-[[[[dimethyl(trimethylsilyloxy)silyl]oxy-dimethyl-silyl]oxy-dimethyl-silyl]oxy-dimethyl-silyl]oxy-dimethyl-silane
  • Molecular Weight (kg)
    607.301
  • Phase
    l
  • PubChem ID
    1.1171e+4
  • SMILES
    C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C
  • Synonyms

Physical Properties

  • Acentric factor
    0.9959
  • Critical pressure (bar)
    6.8
  • Critical temperature (°C)
    415.85
  • Critical volume (m³/kmol)
    2.336
  • Dipole moment
  • Melting temperature (°C)
    -63
  • Normal boiling temperature (°C)
    153

State-dependent Properties

  • API gravity
    37.5665
  • Compressibility factor
    0.0298328
  • Density (kg/m³)
    832.067
  • Dynamic viscosity (cP)
    0.67836
  • Enthalpy of vaporization (mass) (kJ)
    149.798
  • Enthalpy of vaporization (molar) (kJ/kmol)
    9.0973e+4
  • Gibbs free energy (kJ/kmol)
    0
  • Joule–Thomson coefficient
    -6.2293e-7
  • Kinematic viscosity
    8.1527e-7
  • Molar enthalpy (kJ/kmol)
    0
  • Molar entropy (kJ/(kmol·K))
    0
  • Molar heat capacity (kJ/(kmol·K))
    988.136
  • Molar volume (m³/kmol)
    0.72987
  • Parachor
    2.7678e-4
  • Poynting correction factor
    1.03028
  • Prandtl number
    13.5964
  • Saturation pressure (bar)
    3.4739e-6
  • Saturation temperature (°C)
    290.052
  • Solubility parameter
    1.1011e+4
  • Specific enthalpy (kJ)
    0
  • Specific entropy (kJ/kg·K)
    0
  • Specific gravity
    0.832886
  • Specific heat capacity (kJ/kg·K)
    1.62709
  • Surface tension
    0.0183214
  • Thermal conductivity
    0.0811798
  • Thermal diffusivity
    5.9962e-8

Safety Properties

  • Autoignition temperature (°C)
    -273.15
  • Flash point temperature (°C)
    131.726
  • Lower flammability limit
    0.00409592
  • Upper flammability limit
    0.0260649

Environmental Properties

  • Global warming potential
  • Ozone depletion potential