Materials that expand in volume when exposed to heat or flames exceeding a specified temperature.
The property of materials that swell and char when exposed to fire. value Former name for U-value on the Continent.
a material that when exposed to heat, expands to fill a void in the penetration caused by the deformation or combustion of the penetrating item.
An intumescent is a substance which swells as a result of heat exposure, thus increasing in volume, and decreasing in density. Intumescents are typically used in passive fire protection and require bounding installations in order to comply with the law.