According to the table below, the appropriate antifreeze can be prepared by mixing propylene glycol or ethylene glycol with water.
|
Ethylene glycol |
propylene glycol |
%Vol |
||
|
BP(°F) |
FP*(°F) |
BP*(°F) |
FP*(°F) |
5 |
|
27 |
29 |
27 |
29 |
10 |
|
23 |
26 |
22 |
26 |
15 |
|
17 |
22 |
18 |
23 |
20 |
|
8 |
16 |
11 |
19 |
25 |
|
2- |
10 |
1- |
14 |
30 |
|
14- |
4 |
18- |
8 |
35 |
|
45- |
3- |
46- |
1 |
40 |
|
60- |
13- |
60- |
8- |
45 |
|
60- |
24- |
60- |
18- |
50 |
|
60- |
36- |
60- |
31- |
55 |
|
60- |
50- |
60- |
46- |
60 |
|
60- |
60-> |
60- |
60-> |
65 |
|
60- |
60-> |
60- |
60-> |
70 |
|
60- |
60-> |
60- |
60-> |
75 |
- BP=(Burst point)
- FP=(Freeze point )
According to the table above, the amount of use of these materials as antifreeze largely depends on the climatic conditions of the place. For example, in an environment where the lowest freezing point reaches -10 ° C on the coldest days of the year, a mixture of 30% propylene glycol and 70% water may be appropriate. The mixture of 30% propylene glycol has a freezing point of 8 degrees Fahrenheit. However, its correct point is -18 degrees Fahrenheit. It should be noted that the freezing point is the temperature at which ice crystals begin to form. The liquid flakes but does not expand. But the true point of a fluid is the temperature at which liquids solidify and expand, breaking pipes or seriously damaging other parts of the equipment.
