What are the components of antifreeze?
2 Answers
Over 95% of antifreeze used domestically and internationally is ethylene glycol-based aqueous antifreeze. Compared to tap water, the most notable characteristic of ethylene glycol is its ability to prevent freezing, whereas water cannot. Additionally, ethylene glycol has a high boiling point, low volatility, moderate viscosity that changes little with temperature, and excellent thermal stability. Therefore, ethylene glycol-based antifreeze is an ideal coolant. Here are some important notes on using antifreeze: 1. Antifreeze must be replaced every two years. This is because antifreeze has a validity period of two years, and expired antifreeze can cause cylinder corrosion, with severe cases potentially leading to significant engine damage. Furthermore, the freezing point of antifreeze is typically around -25°C. If traveling to colder regions, it's necessary to switch to antifreeze with a lower freezing point. 2. When replacing antifreeze, it's best to have the service performed at a 4S shop or professional repair shop. When topping up antifreeze, try to use the same product as originally installed in the vehicle to avoid chemical reactions. 3. Before winter arrives, it's recommended that vehicle owners check their antifreeze. If you don't have a tester, you can visit a 4S shop or professional repair shop for assistance with testing. This test is usually free of charge. Using a freezing point tester, you can clearly see the antifreeze's freezing point performance.
I enjoy tinkering with cars in my spare time. The main components of antifreeze are usually basic materials like water, ethylene glycol, or propylene glycol. Ethylene glycol is used to lower the freezing point of water, preventing the liquid from freezing in winter or boiling in summer. But these alone aren't enough—it also contains corrosion inhibitors to protect the engine's metal parts, anti-foaming agents to prevent bubbling in the radiator, and dyes like green or orange to indicate its condition. Sometimes, it includes a bittering agent to prevent accidental ingestion. I recommend opting for propylene glycol-based formulas as they're safer, since ethylene glycol is somewhat toxic and poses a risk if ingested. Regularly checking the antifreeze's color and concentration is crucial. If it turns cloudy or the level drops, it means the additives have degraded, and you should replace it promptly to avoid engine rust and damage.
