Automotive antifreeze

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Antifreeze is a cryoprotectant used in internal combustion engines and many other heat transfer applications, such as HVAC chillers and solar water heaters. The purpose of antifreeze is to prevent a rigid enclosure from undergoing physical stresses and catastrophic deformation due to the expansion that occurs when water turns to ice.

Most antifreezes are chemical compounds made to be added to water to reduce the freezing point of the mixture below the lowest temperature that the system is likely to be exposed to. Either the additive or the mixture may be referred to as antifreeze, which enables competition between unmixed antifreeze (the additive) with premixed antifreeze (water + the additive) in common retail packaging.

The term colligative agent may better describe the benefits of these compounds in warm climates, since they not only achieve freezing-point depression in the winter when mixed with water, they coincidentally achieve boiling point elevation of water.

Propylene Glycol Freezing Point
Percent Propylene Glycol (wt. %) Freezing Point (°F)
0 32
10 26
10 25
19 20
20 18
20 20
29 10
30 10
30 7
36 0
40 -5
40 -8
43 -10
48 -20
50 -29
50 -30
52 -30
55 -40
58 -50
60 -55
60 -60

[edit] Also See

[edit] Reference

  1. Wikipedia Antifreeze [1]

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