Ethylene glycol (data page)

This page provides supplementary chemical data on ethylene glycol.

Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions. It is highly recommended that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source and follow its directions.

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Structure and properties

Structure and properties
Index of refraction, nD	1.4318 at 20°C
Abbe number	?
Dielectric constant, εr [1]	41.4 ε0 at 20 °C
Bond strength	?
Bond length	?
Bond angle	?
Magnetic susceptibility	?
Surface tension[1]	47.99 dyn/cm at 25°C
Viscosity[1]	16.1 mPa·s at 25°C

Thermodynamic properties

Phase behavior
Triple point	256 K (−17 °C), ? Pa
Critical point	720 K (447 °C), 8.2 MPa
Standard enthalpy change of fusion, ΔfusHo	9.9 kJ/mol
Standard entropy change of fusion, ΔfusSo	38.2 J/(mol·K)
Standard enthalpy change of vaporization, ΔvapHo	65.6 kJ/mol
Standard entropy change of vaporization, ΔvapSo	? J/(mol·K)
Solid properties
Standard enthalpy change of formation, ΔfHosolid	? kJ/mol
Standard molar entropy, Sosolid	? J/(mol K)
Heat capacity, cp	? J/(mol K)
Liquid properties
Standard enthalpy change of formation, ΔfHoliquid	−460 kJ/mol
Standard molar entropy, Soliquid	166.9 J/(mol·K)
Heat capacity, cp	149.5 J/(mol·K)
Gas properties
Standard enthalpy change of formation, ΔfHogas	−3955.4 kJ/mol
Standard molar entropy, Sogas	311.8 J/(mol·K)
Heat capacity, cp	78 J/(mol·K) at 25 °C

Vapor pressure of liquid

P in mm Hg		1	10	40	100	400	760
T in °C		53.0	92.1	120.0	141.8	178.5	197.3

Table data obtained from CRC Handbook of Chemistry and Physics, 44th ed.

Temperature dependence of ethylene glycol vapor pressure. Uses formula ${\displaystyle \log _{e}P[{\text{kPa}}]=-25.99771\log _{e}T[{\text{K}}]-{\frac {14768.57}{T[{\text{K}}]}}+191.4250+2.062331\times 10^{-05}\,(T[{\text{K}}])^{2}}$ obtained from CHERIC^[2]

Freezing point of aqueous solutions

% ethylene glycol by volume		5	10	15	20	25	30	35	40	45	50
Freezing point (°F)		−1.1	−2.2	−3.9	−6.7	−8.9	−12.8	−16.1	−20.6	−26.7	−33.2
Specific gravity d90°		1.004	1.006	1.012	1.017	1.020	1.024	1.028	1.032	1.037	1.040

Table obtained from Lange's Handbook of Chemistry, 10th ed. Specific gravity is referenced to water at 15.6 °C.

See also "Typical Freezing and Boiling Points of Aqueous Solutions of DOWTHERM SR-1 and DOWTHERM-SR4000" (PDF). Dow Chemical. Archived from the original (PDF) on 27 September 2007. Retrieved 13 June 2007.

Distillation data

Vapor–liquid equilibrium for ethylene glycol/water[3] P = 760 mmHg BP temp. °C % by mole water liquid vapor 110.00 79.8 99.3 116.40 61.3 98.5 124.30 55.9 97.7 124.50 55.3 97.6 126.00 48.2 97.1 128.10 42.6 96.3 129.50 41.1 96.2 130.50 38.8 95.5 131.20 36.5 95.2 135.20 28.9 92.6 136.00 28.3 92.4 138.00 24.1 90.9 142.50 21.6 88.7 149.00 17.8 85.2 158.10 12.9 77.6 167.40 10.2 70.6 178.60 6.5 56.3 184.20 3.4 37.9

Vapor–liquid equilibrium for ethylene glycol/methanol[3] P = 760 mmHg BP temp. °C % by mole methanol liquid vapor 66.70 93.0 99.9 73.20 82.1 99.8 79.60 66.4 99.7 84.70 53.0 99.3 90.20 45.7 99.0 93.80 40.6 98.5 101.40 36.3 97.9 102.70 35.6 97.5 104.90 32.2 96.7 105.10 22.7 94.6 109.90 21.2 93.3 113.00 19.5 92.3 121.50 13.7 86.4 149.60 10.3 74.6 157.50 4.6 51.5 166.30 3.6 42.0 175.20 2.5 30.4 183.50 1.4 18.1 189.10 0.5 6.8

Spectral data

UV-Vis
λmax	? nm
Extinction coefficient, ε	?
IR
Major absorption bands	? cm−1
NMR
Proton NMR	3.3-3.7 ppm
Carbon-13 NMR	62-65 ppm
Other NMR data
MS
Masses of main fragments

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• Except where noted otherwise, data relate to Standard temperature and pressure.
• Reliability of data general note.