CAS 107-21-1 Ethylene glycol (EG) is the standard base fluid for automotive coolants because it can effectively lower the freezing point of water and raise its boiling point. When mixed with water in a 1:1 (50/50) ratio, the resulting coolant empowers the engine to withstand extreme temperatures, ensuring that it remains unfrozen during the depths of winter and does not boil over during the scorching heat of summer.
Modern internal combustion engines generate immense heat during operation. Without an efficient cooling system, an engine would rapidly overheat, leading to thermal stress, lubricant breakdown, component deformation, and potentially catastrophic mechanical failure.
Water cannot provide adequate protection for a car's cooling system because, under standard atmospheric pressure, water has a freezing point of 0°C and a boiling point of only 100°C. Ethylene glycol effectively overcomes these limitations by altering the physical thermodynamic properties of water; concurrently, it provides corrosion protection, thereby enhancing the durability of the cooling system.
Why Do Car Engines Require Coolant?
During operation, internal combustion engines generate a significant amount of excess heat; their normal operating temperature typically ranges between 85°C and 105°C, though temperatures can rise even higher under heavy loads or in high-temperature environments. Without effective coolant to regulate this heat, the engine faces severe consequences, such as excessive metal expansion, degradation of lubricant performance, reduced combustion efficiency, and even component deformation or engine stalling. The function of engine coolant is to absorb, transport, and dissipate this excess heat-facilitated by the radiator-thereby ensuring that the engine remains in a stable and safe operating state.
How Ethylene glycol liquid Improves Coolant Performance
Ethylene glycol optimizes coolant properties via molecular interaction and colligative properties. It lowers freezing point, elevates boiling point, stabilizes heat transfer and boosts corrosion resistance.
1. Freezing Prevention
EG hinders ice crystal formation after blending with water. Based on freezing point depression principle, it effectively reduces the coolant freezing temperature.
2. Ethylene glycol Raises the Boiling Point
Engine working temperatures often approach or exceed the boiling point of pure water, which easily vaporizes and forms steam pockets that weaken cooling efficiency.
Ethylene glycol liquid raises the boiling point of mixed coolant following boiling point elevation formula. A 50% EG-water solution under pressure can withstand temperatures over 120°C. It effectively avoids coolant overflow, vapor lock, cavitation and partial overheating.
3. EG Supports Efficient Heat Transfer
Pure water delivers superior heat transfer, while EG Ethylene glycol offers reliable anti-freezing and anti-boiling capability. Their blend strikes ideal balance among heat exchange performance, temperature resistance and stable system operation.
4. Anti-corrosion Protection
Ethylene glycol mixed coolant carries matched corrosion inhibitors. These additives shield aluminum radiators, iron engine blocks, copper alloy parts, steel pipelines and welding joints from electrochemical corrosion, extending the service life of the whole cooling system.
5. EG Provides Water Pump Lubrication
EG-based coolant lubricates water pump seals and movable parts. It cuts friction and seal abrasion, effectively avoiding early pump breakdown, an advantage pure water cannot offer.
Basic Chemical Information
| Chemical Name | Ethylene glycol/MEG |
| CAS Number | 107-21-1 |
| Molecular Formula | C₂H₆O₂ |
| Molecular Weight | 62.07 g/mol |
| Appearance | Clear, colorless liquid |
| Boiling Point | 197.3°C |
| Freezing Point | -12.9°C |
| Solubility | Completely miscible with water |
CAS 107-21-1 MEG Raw Material Supplier in China
Conclusion
Ethylene glycol (EG, CAS 107-21-1) is widely utilized in automotive coolants; by lowering the freezing point and raising the boiling point of water, it enables automotive cooling systems to maintain reliable operation under extreme environmental conditions and engine operating loads.
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| Packaging Type | Net Weight |
|---|---|
| Steel Drum | 250 kg |
| IBC Tank | 1250 kg |
| ISO Tank | Bulk shipment |
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