Until the 1970s, concrete was the most popular form of passive fire protection for structural steelwork. However, the introduction of lightweight, proprietary systems such as steel protection spray NSW has seen a dramatic reduction in its use.
How fire affects the behaviour of steel structures?
About 550°C temperature will cause a decline in the load-bearing capacity of the steel structure. Besides, an incident fire can reach 800°C plus. The steel structure will lose its yield strength and buckle, causing it to twist, bend and eventually collapse.
For approximately 15 minutes, unprotected steel frames can resist fire. This cycle of resistance must be significantly improved, according to industry fireproofing standards for structural steel.
Based on both the size and function of the building, the duration of this time will vary. An office over 30m high with sprinklers, for example, must have a minimum fire resistance time of 120 minutes.
Steel Protection Spray NSW classified in two ways:
· Reactive
· Non-Reactive
Reactive like Intumescent paints as they gain their fireproofing properties once exposed to extreme temperatures. Through chemical reaction they may foam-like material when exposed to high temperature to insulate the steel structure. Non-reactive fireproofing sprays have fire-stopping properties at all temperature.
When aesthetics come into play with steel exposed to the general public, Intumescent coatings are a perfect solution. Much like paint, the product is applied, with every layer adding to the total thickness.
Fireproofing sprays are particularly suitable for structures where aesthetic requirements are not essential, although a professional applicator may even provide an aesthetically pleasing look. Another advantage is that these are least expensive of all the prominent options in steel protection spray NSW.
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