Heat-transfer fluids

Ethylene glycol · C2H6O2

Density, dynamic viscosity and specific heat capacity of aqueous ethylene glycol as a function of concentration and temperature, computed from CoolProp's incompressible aqueous-mixture correlation (Melinder, 2010). Tabulated over 10–60 wt% and 0–100 °C.

Also known as: MEG, Monoethylene glycol, 1,2-Ethanediol, Ethane-1,2-diol
CAS number: 107-21-1
Tabulated range: 10–60 wt% · 0–100 °C
Properties: Density · Dynamic viscosity · Specific heat capacity · Specific gravity

At 50 wt% · 20 °C

reference snapshot

Density: 1064.9kg/m³
Density: 1.0649g/cm³
Specific gravity: 1.067
Viscosity: 3.693cP
Specific heat: 3312J/kg·K

Explore

Read a value at any point

Move the sliders to interpolate between the tabulated grid points. The readout and chart never go outside the validated 10–60 wt% and 0–100 °C range, and every number is interpolated from the committed table below — nothing is computed from a chemistry model in your browser.

Interactive explorer

Values are interpolated between the tabulated grid points below — sliders stay within the validated 10–60 wt% and 0–100 °C range.

Concentration35 wt%

Temperature20 °C

Density: 1045.0 kg/m³
Density: 1.0450 g/cm³
Specific gravity: 1.047
Dynamic viscosity: 2.470 cP
Specific heat: 3620 J/kg·K

Density (kg/m³) vs wt% C2H6O2 at 20 °C — Ethylene glycol.

Why it matters

What the numbers tell you

At 50 wt% and 20 °C, aqueous ethylene glycol has a density of about 1065 kg/m³ (1.065 g/cm³) — roughly 1.07× the density of water. Its dynamic viscosity is about 3.693 cP, against roughly 1 cP for water at the same temperature, and its specific heat is about 3.31 kJ/kg·K — about 79% of water's 4.18 kJ/kg·K. Those differences carry straight into volume-to-mass conversions, pump and pipe sizing, and the heat needed to change its temperature.

Common grades

A few working strengths

Properties at 20 °C for a handful of concentrations in everyday use, read from the committed grid (interpolated between tabulated points where a grade falls between them). The full table follows below.

wt% C2H6O2	°C	Density kg/m³	SG	Viscosity cP	Sp. heat J/kg·K
20	20	1024.1	1.026	1.662	3896
30	20	1038.0	1.040	2.166	3718
40	20	1051.9	1.054	2.819	3519
50	20	1064.9	1.067	3.693	3312

Sources

Where the numbers come from

Every value on this page is computed by a deterministic model — none is entered by hand. The generating method and the references it is checked against:

▸Melinder, A. (2010). Properties of Secondary Working Fluids for Indirect Systems, 2nd ed. International Institute of Refrigeration - the basis of CoolProp's incompressible aqueous ethylene glycol (INCOMP::MEG) correlation.
▸Yang, C., Ma, P., Jing, F., Tang, D. (2003). Excess Molar Volumes, Viscosities, and Heat Capacities for the Mixtures of Ethylene Glycol + Water from 273.15 K to 353.15 K. J. Chem. Eng. Data 48(4), 836-840 (measured density; via NIST TRC ThermoML archive).

Model: CoolProp==6.6.0 - incompressible aqueous MEG correlation (Melinder 2010) · Generated 2026-06-07

Validation

Checked against a cited value

The model is cross-checked at one independently cited reference point. The page is published only because this check passes.

Property / point	Density · 50 wt% · 20 °C
Cited reference value	1064.8 kg/m3
Model computed	1064.93 kg/m3
Error vs reference	0.012% (tolerance 1%)

Yang et al. (2003), J. Chem. Eng. Data, via NIST TRC ThermoML archive. Yang, C., Ma, P., Jing, F., Tang, D. (2003). Excess Molar Volumes, Viscosities, and Heat Capacities for the Mixtures of Ethylene Glycol + Water from 273.15 K to 353.15 K. J. Chem. Eng. Data 48(4), 836-840 (doi:10.1021/je020140j). Measured density at 293.15 K, ethylene glycol mole fraction x = 0.2248 (= 50.0 wt%): 1064.8 kg/m3, retrieved from the NIST TRC ThermoML archive of that paper. This measured dataset is independent of the Melinder correlation that the CoolProp model is fitted to, so the check is a genuine cross-validation rather than a circular one.

Full tables

Every tabulated point

Rows are temperature (°C); columns are concentration (wt% C2H6O2). Read the cell at the intersection. Specific gravity is density divided by the model water reference of 998.2 kg/m³ at 20 °C.

Density — kg/m³

°C \ wt%	10	15	20	25	30	35	40	45	50	55	60
0	1013.6	1021.2	1029.1	1037.0	1045.0	1052.8	1060.4	1067.7	1074.6	1081.3	1087.9
5	1013.2	1020.5	1028.1	1035.8	1043.5	1051.1	1058.5	1065.6	1072.4	1078.9	1085.4
10	1012.5	1019.6	1026.9	1034.4	1041.8	1049.2	1056.4	1063.3	1070.0	1076.5	1082.7
15	1011.7	1018.6	1025.6	1032.8	1040.0	1047.2	1054.2	1061.0	1067.5	1073.8	1080.0
20	1010.6	1017.3	1024.1	1031.0	1038.0	1045.0	1051.9	1058.5	1064.9	1071.1	1077.1
25	1009.3	1015.8	1022.4	1029.2	1035.9	1042.7	1049.4	1055.9	1062.2	1068.3	1074.2
30	1007.8	1014.2	1020.6	1027.1	1033.7	1040.3	1046.8	1053.2	1059.4	1065.3	1071.1
35	1006.2	1012.3	1018.6	1024.9	1031.3	1037.8	1044.2	1050.4	1056.5	1062.3	1067.9
40	1004.3	1010.4	1016.4	1022.6	1028.8	1035.1	1041.4	1047.5	1053.4	1059.2	1064.6
45	1002.3	1008.2	1014.1	1020.1	1026.2	1032.3	1038.4	1044.5	1050.3	1055.9	1061.3
50	1000.1	1005.9	1011.6	1017.4	1023.4	1029.4	1035.4	1041.4	1047.1	1052.6	1057.8
55	997.8	1003.4	1009.0	1014.7	1020.5	1026.4	1032.3	1038.2	1043.8	1049.3	1054.3
60	995.2	1000.7	1006.2	1011.8	1017.5	1023.3	1029.1	1034.9	1040.5	1045.8	1050.8
65	992.5	997.9	1003.3	1008.7	1014.3	1020.0	1025.8	1031.5	1037.1	1042.3	1047.1
70	989.7	995.0	1000.2	1005.6	1011.1	1016.7	1022.4	1028.1	1033.6	1038.7	1043.5
75	986.7	991.9	997.1	1002.3	1007.7	1013.3	1018.9	1024.6	1030.0	1035.1	1039.8
80	983.6	988.7	993.8	998.9	1004.3	1009.8	1015.4	1021.0	1026.4	1031.5	1036.0
85	980.3	985.3	990.3	995.4	1000.7	1006.2	1011.8	1017.3	1022.7	1027.8	1032.2
90	976.8	981.9	986.8	991.8	997.0	1002.5	1008.1	1013.6	1019.0	1024.0	1028.4
95	973.3	978.3	983.1	988.1	993.3	998.7	1004.3	1009.9	1015.3	1020.3	1024.6
100	969.6	974.5	979.3	984.2	989.4	994.8	1000.5	1006.1	1011.5	1016.5	1020.8

Dynamic viscosity — cP (mPa·s)

°C \ wt%	10	15	20	25	30	35	40	45	50	55	60
0	2.345	2.728	3.178	3.698	4.298	4.994	5.811	6.778	7.930	9.293	10.87
5	1.982	2.295	2.659	3.079	3.559	4.113	4.757	5.514	6.406	7.452	8.649
10	1.694	1.951	2.250	2.593	2.983	3.430	3.947	4.550	5.257	6.079	7.011
15	1.462	1.676	1.925	2.207	2.529	2.895	3.316	3.805	4.376	5.037	5.782
20	1.275	1.454	1.662	1.899	2.166	2.470	2.819	3.223	3.693	4.236	4.845
25	1.121	1.274	1.450	1.650	1.875	2.131	2.424	2.763	3.156	3.610	4.119
30	0.994	1.125	1.276	1.447	1.639	1.857	2.106	2.394	2.729	3.115	3.549
35	0.889	1.002	1.132	1.280	1.445	1.633	1.847	2.095	2.384	2.718	3.094
40	0.801	0.900	1.013	1.141	1.286	1.449	1.635	1.851	2.103	2.395	2.725
45	0.727	0.814	0.913	1.026	1.153	1.296	1.459	1.649	1.872	2.130	2.423
50	0.664	0.741	0.829	0.929	1.041	1.167	1.312	1.481	1.678	1.908	2.171
55	0.610	0.679	0.758	0.847	0.946	1.059	1.188	1.338	1.515	1.721	1.958
60	0.563	0.626	0.697	0.777	0.866	0.967	1.082	1.217	1.375	1.561	1.775
65	0.523	0.580	0.644	0.717	0.797	0.887	0.991	1.112	1.254	1.422	1.616
70	0.487	0.540	0.599	0.664	0.737	0.819	0.912	1.020	1.148	1.299	1.474
75	0.456	0.504	0.559	0.619	0.685	0.758	0.842	0.939	1.053	1.189	1.346
80	0.428	0.473	0.524	0.579	0.639	0.705	0.780	0.867	0.968	1.089	1.229
85	0.403	0.446	0.493	0.543	0.598	0.658	0.724	0.801	0.891	0.997	1.120
90	0.380	0.421	0.465	0.512	0.561	0.615	0.674	0.741	0.820	0.911	1.018
95	0.359	0.398	0.440	0.483	0.528	0.576	0.627	0.686	0.753	0.831	0.921
100	0.340	0.377	0.417	0.457	0.498	0.540	0.584	0.634	0.690	0.755	0.829

Specific heat capacity — J/kg·K

°C \ wt%	10	15	20	25	30	35	40	45	50	55	60
0	4037	3952	3861	3763	3658	3548	3434	3319	3203	3086	2967
5	4039	3957	3870	3775	3673	3566	3456	3344	3231	3117	3001
10	4041	3962	3878	3787	3689	3585	3477	3368	3258	3148	3034
15	4043	3968	3887	3799	3703	3603	3498	3392	3285	3178	3066
20	4046	3974	3896	3811	3718	3620	3519	3416	3312	3207	3098
25	4049	3981	3905	3823	3733	3638	3539	3439	3338	3236	3129
30	4053	3987	3914	3834	3747	3655	3559	3462	3364	3264	3159
35	4057	3994	3924	3846	3761	3672	3579	3484	3388	3291	3189
40	4062	4001	3933	3857	3775	3688	3598	3506	3413	3318	3218
45	4067	4008	3942	3869	3789	3704	3616	3527	3436	3344	3246
50	4072	4015	3951	3880	3803	3720	3635	3548	3459	3369	3272
55	4077	4022	3960	3891	3816	3736	3652	3568	3482	3393	3298
60	4083	4029	3969	3902	3829	3751	3670	3587	3503	3416	3323
65	4089	4037	3978	3913	3841	3765	3686	3606	3524	3439	3347
70	4095	4044	3987	3924	3854	3780	3703	3624	3544	3460	3369
75	4101	4052	3996	3934	3866	3794	3719	3642	3563	3481	3390
80	4107	4059	4005	3944	3878	3807	3734	3659	3582	3500	3410
85	4113	4066	4013	3954	3889	3820	3749	3675	3599	3519	3429
90	4119	4073	4022	3964	3900	3833	3763	3691	3616	3536	3446
95	4126	4081	4030	3973	3911	3845	3776	3705	3631	3552	3462
100	4132	4088	4038	3982	3922	3857	3789	3719	3646	3567	3476

Limitations

Before you use these numbers

▸CoolProp's incompressible aqueous ethylene glycol correlation (INCOMP::MEG), built on Melinder (2010). Tabulated for 10-60 wt% MEG over 0-100 degC, inside the correlation's validated window; values are not extrapolated beyond it. Ethylene glycol is a non-electrolyte, so it is modelled with CoolProp rather than the Laliberte electrolyte correlation used for the acids and bases. Figures are for a pure ethylene glycol-water system; inhibited commercial antifreeze and heat-transfer fluids carry corrosion inhibitors and other additives that shift density, viscosity and freezing point, so check the supplier's data sheet for a specific product. Values are for preliminary design; verify against vendor data for critical service.
▸Values are tabulated only inside the 10–60 wt% and 0–100 °C ranges shown; the correlation is not extrapolated beyond them here.
▸Figures are for a pure ethylene glycol–water system. Commercial grades contain impurities (for example chloride in some caustic grades) that shift density and viscosity; check the supplier's data sheet for a specific product.
▸Use for preliminary design; verify for critical service.

Related calculators

Related guides

Other substances

← All substances