Ethylene Glycol Water Antifreeze

Ethylene glycol is a colorless, slightly viscous liquid with a boiling point of 197.4°C and a freezing point of -11.5°C. It can be mixed with water in any proportion. After mixing, the freezing point is significantly lowered due to the change in vapor pressure of the cooling water.
The degree of decrease decreases with the increase of ethylene glycol content within a certain range.
When the ethylene glycol content is 60%, the freezing point can be reduced to -48.3°C. When this limit is exceeded, the freezing point will rise instead.
Ethylene glycol antifreeze easily generates acidic substances during use, which has a corrosive effect on metals.
Ethylene glycol is toxic, but due to its high boiling point, it does not produce vapor that can be inhaled into the body and cause poisoning.
Ethylene glycol has strong water absorption, and the storage container should be sealed to prevent it from overflowing after absorbing water.
Since the boiling point of water is lower than that of ethylene glycol, water is evaporated during use. When there is a lack of coolant, just add clean water.
This kind of antifreeze can be recycled after use (to prevent it from being mixed with petroleum products). After sedimentation, filtration, adding water to adjust the concentration, and adding preservatives, it can continue to be used. Generally, it can be used for 3-5 years.
However, it must be filtered multiple times to prevent damage to the motor vehicle.
Many people think that the freezing point of ethylene glycol is very low. The freezing point of antifreeze is a neutralized freezing point after mixing ethylene glycol and water in different proportions. In fact, this is not the case. The freezing point will be lower due to the change in the vapor pressure of the cooling water after mixing. significantly reduced.
The degree of decrease decreases with the increase of ethylene glycol content within a certain range, but once it exceeds a certain proportion, the freezing point will increase instead.
Antifreeze liquid mixed with 40% ethylene glycol and 60% soft water has an antifreeze temperature of -25°C; when the antifreeze liquid contains 50% ethylene glycol and 50% water, the antifreeze temperature is -35°C.