DOWTHERM SR-1 and DOWFROST HD Heat Transfer Fluids In ...

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Table 6 – Physical Properties of Solutions of DOWFROST
HD Heat Transfer Fluid
Temp. Density Viscosity Thermal Cond. Specific Heat
°F lb/ft3 cps Btu/(hr ft2)(°F/ft) Btu/(lb°F)
(30 volume % propylene glycol)
10 65.64 13.44 0.235 0.882
20 65.53 9.91 0.239 0.886
30 65.42 7.47 0.243 0.89
40 65.30 5.75 0.247 0.894
50 65.17 4.52 0.251 0.897
60 65.02 3.61 0.254 0.901
70 64.87 2.94 0.258 0.905
80 64.71 2.43 0.261 0.909
(20 volume % propylene glycol)
20 65.11 6.97 0.25 0.908
30 65.01 5.47 0.255 0.911
40 64.90 4.35 0.259 0.915
50 64.77 3.52 0.263 0.918
60 64.64 2.88 0.267 0.921
70 64.50 2.39 0.271 0.924
80 64.35 2.01 0.274 0.928
Table 7 –– Typical Freezing and Boiling Points of Aqueous Solutions of DOWFROST HD †
Wt % Vol % Wt % Vol % Boiling Point Refractive
Propylene Propylene DOWFROST DOWFROST Freezing Point °F @ Degree Index
Glycol Glycol HD HD °F 760 mm Hg Brix †† 22°C
0.0 0.0 0.0 0.0 32.0 212 0.0 1.3328
5.0 4.8 5.3 5.1 29.1 212 4.8 1.3383
10.0 9.6 10.7 10.2 26.1 212 8.4 1.3438
15.0 14.5 16.0 15.4 22.9 212 12.9 1.3495
20.0 19.4 21.3 20.6 19.2 213 15.4 1.3555
21.0 20.4 22.3 21.7 18.3 213 16.0 1.3567
22.0 21.4 23.4 22.8 17.6 213 16.7 1.3579
23.0 22.4 24.5 23.8 16.6 213 17.4 1.3591
24.0 23.4 25.5 24.9 15.6 213 18.4 1.3603
25.0 24.4 26.6 26.0 14.7 214 19.0 1.3615
26.0 25.3 27.7 26.9 13.7 214 19.6 1.3627
27.0 26.4 28.7 28.1 12.6 214 20.2 1.3639
28.0 27.4 29.8 29.1 11.5 215 20.8 1.3651
29.0 28.4 30.9 30.2 10.4 215 21.4 1.3663
30.0 29.4 31.9 31.3 9.2 216 22.0 1.3675
31.0 30.4 33.0 32.3 7.9 216 22.7 1.3687
32.0 31.4 34.0 33.4 6.6 216 23.6 1.3698
33.0 32.4 35.1 34.5 5.3 216 24.4 1.3710
34.0 33.5 36.2 35.6 3.9 216 25.3 1.3621
35.0 34.4 37.2 36.6 2.4 217 26.1 1.3733
† Typical properties, not to be construed as specifications.
†† Degree Brix is a measure of the sugar concentration in a fluid and is important in fermentation and syrups applications. Although there is no sugar
present in DOWFROST heat transfer fluids, the glycol affects the refractive index of the fluid in a similar fashion.
NOTE: Generally, for an extended margin of protection, you should select a temperature in this table that is at least 5°F lower than the expected lowest
ambient temperature. Inhibitor levels should be adjusted for solutions of less than 25% glycol. Contact Dow for information on specific cases or for
further assistance.