Fire Protection of Structural Steel Column Using Board

While it is not combustible, steel can be affected by fire. Once steel is heated above 200°C the properties of the steel in relation to its yield stress and it’s modulus of elasticity begin to change. As the temperature gets higher, the steels ability to carry its design load significantly reduces. The temperature at which the steel loses its ability to carry its design load is known as the critical temperature and in a fire, an unprotected piece of steel can reach this quite quickly. The purpose of passive steel protection systems such as board, paints and sprays is to insulate the steel and increase the time it takes for the steel to reach that critical temperature. The thickness of material required will be based on the Fire Resistance Level (FRL) it needs to meet in accordance with the NCC, along with the size of the steel and the critical temperature that the steel has been designed too. In simple terms the larger the piece of steel is, the less protection will be required. All Promat products and systems have been tested at nationally accredited laboratories around the world to a variety of standards, e.g. AS 1530: Part 4, AS4100, EN13381-4, EN13381-8, BS 476: Part 21 and ASTM E119.

Further Information


  • Up to 4 hours FRL
  • Uniform thickness guaranteed
  • No preparation of the steel required
  • Does not require special equipment
  • Easy maintenance
  • Can be installed simultaneously with other trades
  • Can receive any architectural finish


FRL 60/-/- FRL 90/-/- FRL 120/-/- FRL 180/-/- FRL 240/-/-
PROMATECT®-L Column Cladding X X X X X
PROMATECT® 100 Column Cladding X X X X
PROMATECT® 250 Column Cladding X X X X
PROMATECT® XS Column Cladding X X X X X

Note: FRL */ * / * (Fire Resistance Limit – *Stability / *Integrity / *Insulation)

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