Does Red Antifreeze Contain Propylene Glycol?
Antifreeze is a crucial component in maintaining the functionality and longevity of your vehicle and other systems. However, the color of antifreeze can indicate the type and composition of the coolant. In this article, we explore the key differences between propylene glycol and ethylene glycol, and how these factors relate to the color of antifreeze.Understanding Antifreeze Colors
No color of antifreeze is arbitrary or without meaning. Many marine and RV antifreeze brands, as well as food contact-safe heat transfer fluids, are fluorescent pink when based on propylene glycol. Conversely, Toyota's Super Long-Life antifreeze, ethylene glycol based, shares the same pink hue.
The TMC (Truck Manufacturers Committee), under their truck manufacturers' guidelines, require propylene glycol-based antifreeze to be blue in color. Similarly, Honda and Nissan's Organic Acid Technology (OAT) antifreeze, as well as European G-11 spec antifreeze, are both ethylene glycol-based and colored blue.
According to TMC guidelines, antifreezes that use OAT inhibitors are to be red or red-orange in color. The older Toyota Ethylene Glycol-based IAT coolant, known as Toyota Long-Life, also appears red in color.
Propylene Glycol vs. Ethylene Glycol
Propylene glycol is commonly used as an antifreeze material in recreational vehicles (RVs) and their water systems. When RVs are stored for the winter, propylene glycol helps prevent the pipes from freezing and bursting, ensuring the safety of the system. It is non-toxic, meaning that even if the water system is not completely flushed when the RV is prepared for use again, no one is endangered.
Chemical Cousins: Ethylene Glycol and Propylene Glycol
Ethylene glycol, the chemical cousin of propylene glycol, is used in automotive engine cooling systems and is present permanently within the engine. It is also non-toxic in its pure form; however, its biological conversion within the body is a different story.
Ethylene glycol is metabolized by the body into oxalic acid, a substance that can be toxic to both animals and humans. This characteristic makes ethylene glycol particularly dangerous if ingested. For this reason, it is important to handle ethylene glycol responsibly and store it out of reach of children and pets.
Key Takeaways
Understanding the color and composition of your antifreeze is vital for maintaining the integrity of your vehicle and other systems. While propylene glycol is generally safer, both propylene and ethylene glycols have their roles and safety considerations. Always follow guidelines and manufacturers' recommendations for the proper use of antifreeze.
If you have any further questions or specific concerns about your antifreeze, consult a professional or refer to the manufacturer's guidelines for detailed information.