Physical Properties


Physical Properties (1) Monoethylene Glycol
MEG
Diethylene Glycol
DEG
Triethylene Glycol
TEG
Tetraethylene Glycol
TETRA EG

Formula C2H6O2 C4H10O4 C6H14O4 C8H18O5
CAS Number 107-21-1 111-46-6 112-27-6 112-60-7
Molecular Weight, g/mol 62 106.12 150 194.2
Boiling Point @ 760 mm Hg, °C (°F) 197 (387) 245 (473) 288 (550) 329 (625) Decomposes
Vapor Pressure at 20°C (68°F) mm Hg 0.06 0.002 <0.01 <0.01
Density, (g/cc) @ 20°C (68°F) 1.115 1.118 1.125 1.124
Density, (g/cc) @ 60°C (140°F) 1.096 1.085 1.087 1.093 1.096
Pounds Per Gallon @ 25°C (77°F) 9.26 9.27 9.35 9.37
Freezing Point, °C (°F) -13.4 (7.9) -9.0 (16) -4.3 (24) -4 (25)
Pour Point, °C (°F) <-59 (<-75) -54 (-65) -58 (-73) -41 (-42)
Viscosity, cP @ 25°C (68°F) 16.9 35.7 49.0 58.3
Viscosity, cP @ 60°C (140°F) 5.2 7.3 10.3 11.4
Surface Tension, dynes/cm @ 25°C (77°F) 48 44.8 45.5 44.0
Refractive Index @ 20°C (68°F) 1.430 1.447 1.455 1.459
Specific Heat @ 25°C (77°F) Btu/lb/°F 0.58 0.55 0.52 0.52
Flash Point, °C (°F) 116 (241) (2) 154 (310) (2) 177 (350) (2) 202 (395) (2)
Dipole Moment in Debyes 2.28 2.69 2.99 3.25
Coefficient of Expansion x 104 (0-60°C) 6.5 6.6 7.2 7.3
Thermal Conductivity, Btu hr-1 ft-1 °F-1 25°C (77°F) 0.1490 0.1175 0.1133 0.1106
Thermal Conductivity, Btu hr-1 ft-1 °F-1 25°C (77°F) 0.1490 0.1175 0.1133 0.1106
Heat of Formation, Btu/lb@ 25°C (77°F) -93 -131 -171 -212
Heat of Vaporization, Btu/lb@ 25°C (77°F) 369 234.4 179 139
Electrical Conductivity, mhos/cm,@20°C 1.07 (3) 0.0042 (3) 0.002 (3) 0.0016 (3)
(1) Note: These properties are laboratory results on pure compounds or typical of the product, but should not be confused with, or regarded as, specifications.

(2) Penskey-Martens Closed Cup (PMCC)

(3) Electrical conductivity values are measured on highest quality, pure materials. Contamination by other ionic species from storage, handling, or use may significantly affect the electrical conductivity. The literature value for ethylene glycol is 1.07x10-6 mhos/cm at 25°C.

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