![]() Propylene glycol based antifreezes come in different colors. This is "engine coolant" and should never be used for anything else.įor more information on the exact differences between the two, Elizabeth has written an in-depth explanation here. It should never be released into the environment and takes care to dispose of properly. Propylene glycol is non-toxic to humans and animals, biodegradable, and doesn't have a strong taste or smell.Įthylene glycol, used in engine and automotive antifreeze, is toxic and can cause death, blindness and other illnesses in humans and animals. The critical difference between this antifreeze and engine or automotive antifreeze is its toxicity. ![]() ![]() Well before the burst point the antifreeze may form an icy slush, but this does not expand and does not harm pipes and constricted spaces. The temperature rating of any antifreeze is the burst point, the temperature where a copper pipe filled with the antifreeze will burst. The better quality antifreezes use propylene glycol, though some will use a propylene glycol/alcohol blend. Marine antifreeze is a special, non-toxic mix of chemicals designed to prevent ice formation. Even bilge pumps can be damaged if water in the bilge freezes. Expanding water can exert thousands of pounds per square inch of force against anything constraining it.Īntifreeze in all the spaces where water sits prevents freezing and expansion, protecting your boat's systems from damage.īy flushing and filling all water containing or using systems on a boat, you displace water from areas that may be harmed by freezing. This provides a very high and almost irresistible force which can burst hoses, break plumbing, and even crack engine blocks.
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