Temperature and Silicone: What You Need to Know

Published by Content Cucumber (Tobias Anderson) on Jul 18th 2021

Strong, durable, and versatile, silicone sealant is a favorite for professionals and amateurs alike. With its ability to cure quickly and hold for years, it is hard to find another product with the same sealing power of silicone.

Silicone sealant is forgiving and even novice users can manage effective applications without too much prior knowledge or experience. But, as is the case with most materials, silicone sealant does have it’s preferences.

This article will outline the temperature preferences of silicone sealant during application, the curing process, and over years of exposure.


Silicone sealant can be applied in temperatures as low as -29°C (-20°F), although the lower the temperature the longer the silicone will take to cure.

One should also be aware of complications that can arise with drastic temperature fluctuations. If temperatures change from above to below freezing, the silicone will expand and compress which can cause the seal to crack, break, or crease, ultimately reducing the effectiveness of the seal. The ideal temperature to apply silicone sealant is between 4°C and 32°C.

In extreme cold conditions, using an organic sealant like polyurethane is recommended.


Compared to other materials, silicone transfers heat at a very low rate. This quality of high thermal resistance is what makes silicone so resistant to heat and gives it the ability to maintain its structure over a large temperature range. In fact, silicone is able to keep its structure even at temperatures as high as 93°C (200 °F). That’s Hot!

Some silicone sealants are even designed to be more resistant to heat than the typical product making it possible to seal and rebuild engine gaskets with a tube of silicone and a caulk gun.

Additionally, silicone does not burn easy, making it perfect for projects where flammable material would be a liability. The product does not release any smoke or harmful gasses and can be used comfortably to seal in household electrical appliances.

Side note: Moisture

The most damaging element to silicone sealant is not heat or cold, but moisture. Before applying a bead of sealant, one should be absolutely sure to dry the surface completely, as failing to do so will result in a weak seal.

Never apply silicone sealant in the rain, snow, or even heavy fog.

So when checking the weather report for ideal conditions to use your silicone sealant, don’t worry if it's cold or hot, just make sure it's dry!

Ready to experience the wonders of silicone sealants for yourself? Be sure to browse our selection online today!