INSTALLATION GUIDE · USER MANUAL
GAS HEATER SERIES
G&D CHILLERS, INC.
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GD
-
MNL
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GSHTR_R2024B
15
PROPYLENE GLYCOL PROPERTIES
Percent by
volume
Percent by
weight
Freezing point
°F
Degrees Brix
°Bx
32.4
33.0
5.3
24.4
32.8
33.4
4.8
24.8
33.1
33.7
4.4
25.0
33.5
34.0
3.9
25.3
34.0
34.6
3.1
25.8
34.4
35.0
2.4
26.1
35.0
35.6
1.5
26.5
35.5
36.0
0.8
26.9
36.5
37.0
-0.8
27.5
37.5
38.0
-2.4
28.0
38.2
38.7
-3.7
28.4
38.5
39.0
-4.2
28.5
For most applica�ons, G&D Chillers recommends no less than and no more than 35% propylene
glycol/water mixture.
The volume percentages in this table apply for pure propylene glycol; inhibited propylene glycol
solu�ons will require higher volume percentages. For example, a solu�on of 36.6%vol DOWFROST
contains 35%vol pure propylene glycol.
Use the refractometer included with the chiller to verify proper glycol concentra�on.