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G11. A simple class for low-cost antifreeze brands. As a basis, such coolants use a mixture of water and ethylene glycol with the inclusion of a small package of anti-corrosion additives of organic or inorganic origin. In modern engines, G11 antifreeze is rarely used, it is mainly used on board domestic cars with a cast-iron cylinder block. The trade-off for the G11's low-cost price is the short lifespan of this class of coolant.
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G12. A group of carboxylate antifreezes, involving the use of a water-ethylene glycol base and organic additives. Their key feature is the impact directly on the centers of corrosion - a protective film is formed only in places subject to corrosion. This significantly improved heat transfer and ensured a long service life of G12 coolants (more than 5 years).
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G12+. Further improvement of the G12 class with the inclusion of substances based on organic acids in the formula to prevent the formation of corrosion. Those. coolants of the G12 + brand not only form a protective film in the foci of corrosion, but also take preventive measures to prevent their occurrence.
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G12++. The most advanced type of coolant of the G12 group. The hybrid composition of antifreezes of this class includes not only organic compounds, but also silicate additives. This combination combines t
...he advantages of organic and inorganic additives in one bottle, providing effective protection of the engine walls from corrosion. Since 2012, coolants in this category have been replaced by antifreezes from the more advanced G13 group.
— G13. The most advanced class of modern coolants. The ethylene glycol in their composition has been replaced by propylene glycol, which is much less toxic and degrades faster after use. In addition, the properties of such antifreezes make it possible to use them in powerful forced engines, including sports ones. However, such compositions are not cheap.
