The function and different performance of antifreeze

Created on 09.08

Antifreeze, or coolant, is the "lifeblood" of an engine. Its functions extend far beyond just freeze protection.

 Key roles include:

 1) Temperature Control: Prevents freezing in winter and boiling over in summer;

 2) Corrosion Inhibition: Protects metals (like aluminum, cast iron, copper) in the radiator, water pump, and engine from rust and corrosion;

 3) Boiling Point Elevation: Operates effectively at high temperatures;

 4) Scale Prevention: Inhibits scale formation to maintain efficient heat transfer.

 a key performance differentiator among coolants is their operating temperature range, which is directly determined by their formulation.

1) Freezing Point

This is the lowest temperature at which the coolant will resist freezing. Common specifications include -15°C, -25°C, -35°C, and -45°C. A lower freezing point ensures the coolant remains liquid in extreme cold, preventing catastrophic damage to the engine block and radiator.

2) Boiling Point

This is the temperature at which the coolant resists boiling. While water boils at 100°C, a high-quality antifreeze/coolant typically has a boiling point of 106°C or higher, often exceeding 129°C. This higher boiling point prevents the coolant from "boiling over" under heavy load or in hot climates, providing a much wider margin of safety for modern high-temperature engines.

choosing a coolant requires selecting the right freezing point based on the region's minimum ambient temperature (usually 10°C lower than the coldest expected temperature). Simultaneously, its high boiling point offers essential protection against overheating. The freezing and boiling points are the critical temperature metrics that define its core performance.

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