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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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