Physical Properties

Diethylene glycol is similar to ethylene glycol in many respects but has a higher boiling point, viscosity and specific gravity – as might be predicted from its higher molecular weight. Its properties are sufficiently different from those of ethylene glycol to make it a more desirable material in many applications.

Physical Properties of Diethylene Glycol

Scientific Common
Autoignition Temperature 229°C @ 1013.25 hPa 444°F @ 760mm Hg
Critical Pressure 4,605 kPa 34,540.3 mm Hg
Critical Specific Volume 0.312 L/gmol 5.00 ft3/lbmol
Critical Temperature 406.85°C 764.33°F
Dielectric Constant 31.69 31.69
Electrical Conductivity at 20°C 0.42 x 10-6 mhos/cm 0.0042 micromhos/cm
Evaporation Rate (Butyl Acetate = 1) <0.001 <0.001
Flammable Limits in Air, Upper 12.3%(V) 12.3%(V)
Flammable Limits in Air, Lower 2.0%(V) 2.0%(V)
Flash Point, Closed Cup 138°C @ 1013.25 hPa 280°F @ 760 mm Hg
Heat of Combustion at 25°C -2,154.82 kJ/gmol -8,730.4 Btu/lb
Heat of Vaporization at 1 atm 57.9 kJ/gmol 234.4 Btu/lb
Molecular Weight 106.12 g/mol 106.12 g/mol
Normal Boiling Point 244.9°C @ 1013.25 hPa 473°F @ 760 mm Hg
Δ BP/δ P (750 to 770 mm Hg) 0.052°C/mm Hg
Normal Freezing Point -6.5°C 20.3°F
Onset of Initial Decomposition 240°C 464°F
Refractive Index, nD, at 20°C 1.4472 1.4472
Solubility in Water at 20°C 100.0 wt% 100.0 wt%
Solubility of Water in DEG at 20°C 100.0 wt% 100.0 wt%
Specific Gravity (20/20°C) 1.1182 1.1182
δ Specific Gravity/δ T(10 to 40°C) 0.00073/°C 0.00073/°C
Surface Tension at 25°C 44.8 mN/m 44.8 dynes/cm
Vapor Density (air = 1) 3.65 3.65
Vapor Pressure at 25°C 0.008 hPa 0.006 mm Hg
Dynamic Viscosity at 20°C 35.7 mPa s 35.7 cP

Note: These properties are laboratory results on pure compounds or typical of the product, but should not be confused with, or regarded as, specifications.

Contact Us

This question is for testing whether you are a human visitor and to prevent automated spam submissions.
4 + 5 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.