Glycol Percentage Relative to Freeze Point Propylene Glycol www.ClenAir.com Freezing Point Propylene Glycol Solution (%) 0% 10% 20% 30% 40% 50% 60% Glycometer™ Temperature (F)° 32° 26° 18° 7° (-8°) (-29°) (-55°) Ethylene Glycol
Ethylene Glycol based water solutions are common in heat-transfer applications where the temperature in the heat transfer fluid can be below 32 o F (0 o C).Ethylene glycol is also commonly used in heating applications that temporarily may not be operated (cold) in surroundings with freezing conditions - such as cars and machines with water cooled engines.
to operate at temperatures below the freezing point of water. It then becomes necessary to suppress the freezing point in order to protect the system from freezing or bursting pipes. In these types of applications, adding propylene glycol to the water will achieve the desired operating temperature.
These questions ultimately affect the mixture ratio of the glycol. For example if a coolant loop or system is being winterized and temperatures will fall down to -10°F at the lowest, a mixture of 30% propylene glycol to 70% water will be enough to protect the system. 30% propylene glycol has a freeze point of 8°F but the burst point is -18°F ...
You may remember that about 93% of most coolant is ethylene glycol, another few percentage points are water and/or a solvent to keep rust/corrosion inhibitors in solution and the remainder are those inhibitors. The inhibitors make a huge difference, and they're what all the arguments are about. Didn't we talk about all these coolants last year?
I want to use ethylene glycol or propylene glycol as an anti-freeze. What are the freezing points of various aqueous solutions of these chemicals?
www.veximchem.com/products M/mono ethylene glycol-antifreeze.html
Mono ethylene glycol colour can be blue antifreeze, green and colorless depending on additives. Take a look at freezing points of aqueous monoethyelene glycol anti freeze mixture. Adding more than 70% of ethylene glycol cooler in the solution the freezing point gets higher:
For many heat-transfer applications it is necessary to use a heat-transfer fluid with lower freezing point than water. The most common antifreeze fluid - ethylene glycol - must not be used where there is a chance of leakage to potable water or food processing systems. In food processing systems the common heat-transfer fluid is based on propylene glycol.
The minimum freezing point temperature is at about −36 °F / −37.8 °C corresponding to 60–70% glycerol in water. Glycerol was historically used as an antifreeze for automotive applications before being replaced by ethylene glycol, which has a lower freezing point. While the minimum freezing point of a glycerol-water mixture is higher ...
ethylene glycol as an antifreeze is based on its ability to lower the freezing point when mixed with water. The physical properties of ethylene glycol-water mixtures are therefore extremely important. The end uses for ethylene glycol are numerous (See Table 1). Ethylene Glycol – The Versatile Performer