Paint thinner is a solvent that is commonly used to thin out paints, clean brushes, and remove paint from surfaces. It is a chemical mixture that typically contains a variety of organic solvents, such as acetone, xylene, toluene, and mineral spirits. However, one question that arises frequently is whether or not paint thinner can freeze.
It is unlikely that paint thinner will freeze because the freezing point is extremely low, but proper storage is still important.
For instance, mineral spirits, which are often used to thin oil-based paints, have a freezing point of around -65°F, which means they are unlikely to freeze unless stored in extremely cold conditions. On the other hand, some other solvents, such as acetone, have a higher freezing point and can freeze at a temperature of around -140°F.
The best place to store paint thinner
It’s worth noting that storing paint thinner in very cold conditions is generally not recommended, even if the solvent itself doesn’t freeze. This is because the low temperatures can cause some of the solvents to evaporate, which can alter the composition of the paint thinner and make it less effective.
It’s also worth remembering that if a can of paint thinner has been very cold and then warms up, the chemical composition may have been altered, making it less effective or even dangerous to use.
If you need to store paint thinner, it’s best to keep it in a cool, dry place, away from sources of heat or flame. A dark, well-ventilated cupboard or shelf is usually a good choice. It’s also important to keep paint thinner away from children and pets, as it can be highly flammable and toxic if ingested.
What happens if paint thinner freezes
It is unlikely that your paint thinner will freeze, but the extreme cold can potentially cause a few issues. When some solvents in paint thinner get really cold, they can expand or thicken and cause the container to crack or rupture, which can be dangerous.
In addition, the cold can cause some of the solvents in the mixture to separate, which can alter the chemical composition of the paint thinner and make it less effective or even unusable.
When paint thinner warms back up, it’s possible that the solvents may not fully reintegrate and may remain separated, which can cause problems if you attempt to use the paint thinner in this condition.
When your paint thinner has been stored in a cold environment, it’s important to examine the container carefully for any signs of cracking or damage. You should also check the contents of the container to ensure that the solvents are still fully mixed and have not separated. If the paint thinner appears to be damaged or altered, it’s best to dispose of it properly and obtain a new, fresh supply.
As with any solvent, it’s best to follow proper storage guidelines for safety and usability of the product.
Although it is unlikely that paint thinner will freeze, it’s a good idea not to take a chance and go ahead and store it somewhere cool but not cold.