Definition - What does Intumescence mean?

Intumescence is the occurrence where a substance increases in size when exposed to a significant increase in temperature. It is typically used by fire safety personnel as a passive fire protection mechanism to indicate the potential existence of a fire. Substances used for intumescence increase in size and decrease in density, a quality that is used in containing the spread of a fire.

Corrosionpedia explains Intumescence

Intumescence is applied in the use of passive fire protection devices. Such devices are fire-resistant doors, walls or glass. It is classified based on the type of char produced when exposed to heat. There are two main types of intumescence: hard and soft. Soft char reduces heat transfer by being a poor conductor of heat, while hard char is produced with graphite and used for external fire-proofing.

This definition was written in the context of Fire protection

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