[ANSWERED] Does RV Antifreeze Evaporate? 

Winter isn’t always convenient for everyone, especially those who live in RVs or trailers. Excessive cold temperatures like sub-zero always cause frozen water lines or plumbing on their RVs, making it unpleasant for the RVers. And this is the time when the RV antifreeze plays an important role. It’s basically a liquid that has a much lower freezing point compared to water. Therefore, it’s used in plumbing by replacing the water to make strong protection against dangerous freezing. 

But there’s a common concern that comes to RVers’ minds regarding the antifreeze’s evaporation while using it. Does antifreeze evaporate over time? Well, yes it does

Does RV Antifreeze Evaporate

Does RV Antifreeze Face Evaporation?

Yes, RV antifreeze is vulnerable to evaporation. But luckily, it evaporates pretty slowly than water. This is why antifreeze is highly capable of protecting the plumbing efficiently for a prolonged period. But when does the evaporation start? Naturally, evaporation can occur at any time, especially when its lifespan comes to an end. But when it comes to outer impact, antifreeze evaporation can occur in two cases. The main case is when the temperature is high. And the other case is when the antifreeze is mixed with water at a fifty-fifty ratio. 

It has been found that the vapor pressure of antifreeze is 0.1 torr at 25°C. That means antifreeze will start its evaporation at 25°C or 76°F. As you can see, the value is pretty lower. That’s why this evaporation process is comparatively slower which is actually normal. But when the temperature will increase, the evaporation rate will also increase and the process becomes faster. On the other hand, in terms of mixing water, when the water amount is greater than the antifreeze, the evaporation rate gets increased. It’s true that this mixed solution will still evaporate slower than water, unlike antifreeze itself. 

In the end, let us make it clear that the evaporation is very much slower you really don’t have to worry about it. And where the antifreeze is deep down in the plumbing, they actually don’t evaporate because of the sealed environment.

Frequently Asked Questions (FAQs)

Can RV antifreeze be reused?

Yes, RV antifreeze is reusable. You can store it in a container, seal it, and finally reuse it when necessary. 

How long does RV antifreeze last?

Most RV antifreeze lasts anywhere between 1 to 5 years once applied. But if it’s kept properly sealed, it’ll remain effective for even longer.

What antifreeze should I use for the RV?

It’s better to use propylene glycol based antifreeze for your RV plumbing. The notable properties of this antifreeze are this antifreeze is specially made for plumbing and it’s non-toxic and non-flammable, unlike ethanol-based antifreeze. 


So, it’s clear by now that RV antifreeze does evaporate but it’s so slow that it can’t be understood and seems like it doesn’t evaporate. Yes, evaporation is a negative impact here. But the extremely lower rate of it can’t make any significant difference in the antifreeze’s efficiency. If you have any confusion or further queries, feel free to knock us.  

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