The Benefits of Using Silicone Sealants in High Temperatures

Silicone sealants offer fantastic advantages over conventional adhesives and sealants when you want to use them in high-temperature environments. Bonds made with silicone can’t take very heavy loads, but they can withstand very high temperatures, which is why silicone is mainly used for sealants.

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Resists Melting for Extended Periods

Many materials respond to high temperatures by liquefying and melting. But silicone sealants will expand outwards before they melt. And they’ll continue working as a sealant while they do this. When the environment is less hot, the silicone will cool and contract, going back to its original shape and size. This makes it a useful product for applications such as computer parts, where high operating temperatures can be encountered.

If you continue heating silicone past its expansion point, it will eventually melt. But, typically, it won’t liquefy and run – it will go soft but stay in place. And once the temperature drops, the silicone will simply harden and reset.

Fire Retardant

Silicone sealant that has been designed for use in the context of high temperatures won’t catch fire and burn. This has important health and safety benefits for applications where fire must be contained or where it is important that fire-resistant materials be used.

A fire-retardant silicone sealant can be used for sealing and perimeter pointing in structures that are fire-rated. With a movement accommodation of plus or minus 25%, the sealant’s flexibility makes it a great choice for sealing construction joints that are prone to movement.

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Retains Its Properties

In temperatures up to 200° C of continuing exposure, or even 300°C for shorter intervals, silicone retains its properties. That is, it will continue to resist moisture and weathering and will remain flexible. For this reason, it’s used for high-temperature duct work, for sealing off heating elements and for industrial applications of all kinds.


Given its unique qualities in high temperatures, it’s a welcome surprise that silicone is actually one of the cheapest sealants. It’s available from suppliers such as This makes it a cost-effective choice for a large number of heat-sensitive applications.

Because silicone also resists mildew and bacteria, it’s often also used as a sealant in places where it may come into contact with food being cooked at high temperatures, such as commercial and catering ovens.