I didn't wait until Monday - I wrote to the technologist this morning and this is what he wrote back to me:
the difference in antifreezes based on ethylene glycol and propylene glycol is only in anti-corrosion additives (ethylene glycol itself is corrosive), their basis and principle of action.
Silicates, phosphates, nitrites, amines, nitrates and their combinations. Silicate additives cover the entire inner surface of the cooling system with a protective anti-corrosion layer (like scale in a kettle), which provides protection against corrosion. service life, no more than 2 years, afraid of overheating - no more than 105°C, otherwise it loses its anti-corrosion properties (not suitable for high-temperature loaded engines)
Salts of carboxylic acids and small additions of silicates (usually done in Europe) or phosphates (mostly Japanese). The protective layer is formed by silicates. Term of operation - no more than three years.
Additives based on carboxylic acids. Carboxylate additives form a protective layer only in places of corrosion, which increases the heat transfer of antifreezes. Salts of organic additives form a protective layer in places where corrosion is localized. The service life of antifreeze with such additives is about five years.
There is still a new generation of modern antifreezes. They contain highly reactive packets of silicate additives. But we do not use them in production yet. They combine the advantages of hybrid and carboxylate technologies. They create dynamic and static protective layers, have exceptional thermal conductivity and heat capacity.
I thanked him for the quick answer, he asked me why this was for me. I wrote to him that we are dealing with the issue of antifreeze on the forum, then he added:
In addition to color, pay attention to the production technology, the presence of standards and tolerances of manufacturers. I emphasize the need to periodically monitor the state of antifreeze in the system. A jelly-like mass may form on the inside of the neck of the expansion tank (unscrew the cap and look inside), at an ambient temperature of minus 10-15 ° C, cloudiness, precipitation, and more frequent operation of the fan are noticeable in it. Antifreeze can change the color from the original to red. This means that corrosion is actively occurring. The fluid needs to be changed urgently, regardless of how long it has served you.
I hope that Google translator did not confuse the content. )
