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Properties of substance:

octamethylcyclotetrasiloxane

Group of substances:

elmentoorganic

Empirical formula (Hill's system for organic substances):

C8H24O4Si4

Structural formula as text:

((CH3)2SiO)4

Molar/atomic mass: 296.61

Melting point (°C):

17.4

Boiling point (°C):

175.8

CAS №: 556-67-2

Solubility (g/100 g of solvent):

carbon tetrachloride: soluble [Ref.]
water: insoluble [Ref.]

Numerical data:

Thermal conductivity (W/m·K): 0.1038
Thermal conductivity (W/m·K): 0.1131

Density:

0.95755 (18.85°C, g/cm3)
0.9558 (20°C, d4)
0.94616 (28.45°C, g/cm3)
0.94421 (30°C, g/cm3)
0.90932 (60°C, g/cm3)
0.86135 (100°C, g/cm3)
0.79024 (160°C, g/cm3)

Refractive index (nD):

1.3968 (20°C)

Permittivity (dielectric constant):

2.39 (23°C)

Dipole moment (D):

0.66

Viscosity (mPa·s):

2.45 (20°C)
2.06 (30°C)
1.7 (40°C)
1.44 (50°C)
1.23 (60°C)
1.06 (70°C)
0.71 (100°C)
0.41 (150°C)

Surface tension (mN/m):

17.93 (20°C)
17.28 (30°C)
16.6 (40°C)
12.38 (100°C)
8.18 (160°C)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

513.6 (l)

Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

-2195 (l) [Ref.]

Enthalpy (heat) of vaporization ΔvapH (kJ/mol)

54.94 (l) [Ref.]

Critical temperature (°C):

313

Critical pressure (MPa):

1.33

Critical density (g/cm3):

0.306

Critical volume (cm3/mol):

970

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-402, 6-163
  2. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 1.288, 5.101, 5.124, 5.165, 6.73, 6.154
  3. International Journal of Molecular Sciences. - 2007. - Vol. 8, No. 5. - pp. 421
  4. Journal of Chemical and Engineering Data. - 2005. - Vol. 50, No. 5. - pp. 1711-1719
  5. Warrier P.K., Warrier H. Design and evaluation of heat transfer fluids for direct immersion cooling of electronic systems. - Thesis In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the School of Chemical and Biomolecular Engineering. - Georgia Institute of Technology, August 2012. - pp. 257-274
  6. Yaws C.L. Thermophysical properties of chemicals and hydrocarbons. - 2008. - pp. 47, 150, 241, 353, 477, 571, 619, 655, 679, 731
  7. Андрианов К.А. Кремнийорганические соединения. - М.: ГНТИХЛ, 1955. - pp. 415 [Russian]
  8. Новый справочник химика и технолога. Основные свойства неорганических, органических и элементоорганических соединений. - СПб.: НПО Профессионал, 2007. - pp. 1203 [Russian]
  9. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 408 [Russian]
  10. Шетц М. Силиконовый каучук. - Л.: Химия, 1975. - pp. 30 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru