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Intumescence (Latin: intumescencia, from tumor - swelling) denotes an expansion or swelling, i.e. an increase in volume of a solid body without chemical conversion.

Fire protection

In the photomontage, the small orange became the large blackish piece of intumescent material. This
intumescent layer forms a light carbon foam , a light ash of low conductivity. This effect is often used to protect cables and structural steel. During intumescence, water is released, which dilutes acids and has an endothermic / cooling effect.
Intumescent mastic as Ab partitioning in a concrete ceiling having a 2-hour fire resistance rating .
S90 fire seals made of fire protection bricks. The intumescence creates an ash shield that increases the distance to the fire and prevents spontaneous combustion on the side facing away from the fire.

In fire protection, the term describes the appropriate "swelling" or foaming of materials. Intumescent building materials increase in volume and correspondingly decrease in density when exposed to heat . As a rule, intumescent materials are used in preventive structural fire protection, where they can perform the following tasks:

Intumescent building materials are also called "intumescent layers". In Germany , intumescent building materials, the building products they contain and the types of construction made with them are subject to approval.

→ see main article fire protection coating

Further meaning

In medicine , intumescence means an increase in the size of an organ or tissue (it can also be used to describe corresponding pathological changes - tumor ).

Web links

Commons : Intumescence  - collection of images, videos and audio files