Engine Coolant

Engine coolant is a homogeneous ethylene glycol or propylene glycol-based liquid chemical that reduces the freezing point of the cooler, increases its boiling point, and prevents rusting when added to the cooling systems of the engines.

Concentrated Antifreeze: Antifreeze is produced without being diluted with water but must be diluted with water when used.

Diluted Antifreeze: Antifreeze released to the market, diluted in volume with water.

How to Use Antifreeze

Concentrated Antifreeze freezes at about -18 ⁰C; however, when mixed with water, the mixture starts to freeze at lower temperatures. Antifreeze not only decreases the freezing point of water mixtures but also increases their boiling point.

Characteristics of Pure Water to be Used in Antifreeze Dilution

Characteristic Value
Chloride, mg/L, maximum 25.0
Sulfate, mg/L, maximum 50,0
Hardness (in CaCO3), mg/L, maximum 20,0
pH 5,5-8,5
Iron, mg/L, maximum 1,0

Types of Antifreeze

Inorganic acid technology; commercial types of antifreeze manufactured using mineral/inorganic inhibitors such as phosphate, borate, silicate, nitrite, nitrate, etc.

Organic acid technology; organic types of antifreeze containing only organic corrosion inhibitors such as carboxylates.

Hybrid acid technology; hybrid types of antifreeze in which both inorganic and organic acid technologies are used.

Types of antifreeze with different additive technologies should not be mixed under any circumstances.

Reserve Alkalinity in Antifreeze

It is a parameter used to determine the number of alkaline components in engine coolants. It is a quality control test frequently used during the production phase. Alkaline inhibitors contained in antifreeze provide a buffering effect and neutralize acids in exhaust gas leaks in the cooling system.

Colors of Antifreeze

Special pigments included in the antifreeze give it a color; however, the color or color tone is not a parameter indicator for quality.

Usage Rates

It is not recommended to use 100% Antifreeze. If it is desired to add to the cooling system due to reduction, it is necessary to add antifreeze and water at the appropriate rate by mixing. The recommended antifreeze usage rate is 50%. When the antifreeze usage rate is below 33%, its use is not recommended since its effect against corrosion is reduced.