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Numerous research programmes show that some types of fully stressed steel sections can achieve a fire resistance of 30 minutes without any additional protection materials being applied. However, these apply to a limited number of steel sections only, based on the allowable Section Factor Hp/A. Section Factor is a common term used in fire protection for steelwork.

Typical building regulations usually require certain elements of structure to be fire resistant for more than 30 minutes and up to a specified minimum period of time. The thickness of any fire protection material depends on a number of factors, such as:
Duration of fire resistance specified;
Type of protection used (e.g. board, paint, spray etc);
Perimeter of the part of steel section exposed to fire;
Shape and dimensions of the steel section

IMPORTANT NOTE: When using Promat protection systems for structural steelwork, conservative limiting temperatures of 550°C and 620°C are referred to for columns and beams respectively and are in general use throughout this section. Apart from temperature data, the fire tests also need to demonstrate the ability of cladding to remain in place, usually described as “stickability” of the material, for the maximum duration for which the protection may be required.
The availability of thin boards and the low weight of Promat systems, plus the possibility of prefabrication, ensure maximum cost-efficiency.

How To Specify
Here are some of the factors to consider when determining the correct specification to ensure the structural steel provides the required fire performance. Further advice can be obtained from the Promat Technical Department.

Choose the material to be used
Determine the period of fire protection required
Determine the section factor (Hp/A) of the steel section
Using the Hp/A factor and the required fire protection period, determine the board thickness and fixing details
 
Structural Steel Category
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Column cladding
 
Beam cladding
 
Concrete/Timber column claddings
 
 
 
 
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