RESISTANCE TO FIRE
The resistance to fire is the ability of the building material to keep its mechanical stability, not to spread flames, or to have a thermal insulation for a certain period of time. The resistance to fire is expressed as the time, in minutes, from the beginning of the heating period until the tested component ceases to comply with the requirements that it must meet. The fire resistance test is carried out by following the instructions of Circular no. 91 of the Ministry of the Interior (1961), which requires the installation of a portion of wall (or floor) at the hole of a furnace. The furnace is heated following a well-defined temperature scale, and some parameters are controlled that help identify the fire resistance class of the material.
The following aspects are controlled:
- Mechanical stability
- Resistance to flames, fumes and exhausts
- Thermal insulation (symbol : R)(Symbol : E) (symbol : l)
The building material can have a variable fire resistance level, resulting from the combination of the REI, RE, R requirements.