Design temperature °C

Design temperature is controlled by the steel's utilization rate, at high utilization the steel can withstand lower temperature and at low utilization the steel can withstand high temperatures

Fire class

In this case, R stands for load-bearing capacity and the time that the building component is able to carry the current load in the event of a standard fire.

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If the steel is close to a concrete floor, only 3 sides of the steel are exposed to fire. This means that the A / V value drops to a lower level and less insulation may be required.


PAROC FPS 17 is delivered as a slab in format 600x1200. Depending on the type of beam and the thickness of the insulation, the consumption needs to be calculated for each individual case. For example, for HEA beam that is insulated>

as a box, you need to calculate like this: (h + thickness + thickness x2) + (b x2). Se projekteringsanvisning för detaljerad monteringsbeskrivning.


The rate of increase in temperature of a steel cross-section is determined by the ratio of the heated surface area (Am) to the volume (V). This ratio, (Am /V), has units of m-1 and is known as the section factor. Members with low section factors will heat up more slowly. The section factor is thus a measure of the rate at which a section will heat up in a fire and the higher its value, the greater will be the protection thickness required.

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