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Intumescent coatings for passive fire protection-buildings come in various shapes and sizes. From specially built square warehouses, high stud ceilings and plain concrete walls, to complex architectural design facilities, which are full of intricate corridors, offices, meeting rooms, corners and gaps. For what is considered a building, there are indeed unlimited possibilities. However, there is one main thing in common between all these buildings-once you remove all the concrete, wood, plaster, glass and other building materials, you have only one thing left, a frame made of structural steel. .

The structural steel of your building is arguably its most important feature. Because we can't see it, it is often overlooked. Once the steel structure is in place during the construction of the building, nothing needs to be done. Building owners know that they can rely on strong materials to stand tall in the next few decades, and even in the case of refurbishing buildings, the steel structure is likely to remain the same. As the main form of stability of the building, you don't want to fix it, but choose to set it and forget it.

Structural steel has high strength and can withstand extremely heavy loads. It is flexible enough to withstand any slight ground movement, and at the same time stable enough to stand upright. It is almost perfect.

However, there is a caveat to the material composition of structural steel. Although it provides strength in all suitable places, it is also very effective in transferring heat. This can be catastrophic because in the event of a fire, structural steel can act like wires, conducting heat by itself and spreading it around the building. When heat spreads in the building, the steel will also soften, and the structural integrity of the building will be severely damaged. Even if the fire is extinguished in time, if the structural steel has softened and warped, the building is no longer suitable for living.

So how do we protect structural steel from potentially catastrophic fires? The answer is intumescent paint.

There is a common misconception that intumescent coatings are the same as "fire-resistant coatings." This destroys the technology hidden under the coating surface, and the application of intumescent coatings is far more impressive than simple fire protection. First, it is more like a coating than paint. When heat is applied to the coating, it will swell in a controlled manner. This is possible because the coating reacts with heat to produce carbonaceous carbon. This carbon is formed by a large number of bubbles, which expand to form an insulating layer around the structural steel. The insulation layer prevents heat transfer into the steel beams and significantly reduces the chance of local fire spreading to other parts of the building, while protecting the steel from heating to the point where it starts to soften and lose its structural integrity.

In order to prevent the structure of the building from collapsing, intumescent coatings are designed to prevent the steel from reaching a critical temperature, at which time its load-bearing capacity becomes equal to the effect of the applied load. The critical temperature of steel is between 360-750 degrees Celsius (depending on the loading scheme), but the most common critical temperature range is between 500-620 degrees Celsius.

Intumescent coatings will not change the inherent characteristics of the materials they are applied to, and different types of intumescent coatings can be used for a variety of materials. Although steel is the most common, it can also be applied to wood, concrete, and other composite materials.

The preferred method of applying the intumescent coating is to spray it onto the steel using airless paint equipment. This ensures fast and high-quality completion. Although brushes and rollers can be used to apply intumescent paint, more care is needed to ensure that the topcoat is fully distributed with the correct consistency.

For intumescent coatings to function, sufficient space is required for expansion, which needs to be considered in the initial design stage of the building. If it is placed too close to any fixtures or wood (such as door frames), its ability to form an insulating layer will be affected, which means that heat can still potentially soften the structural steel and enter other parts of the building. Although it can Modification of intumescent coatings, but the process is complicated, difficult, and will incur huge financial costs.

Let Tech Passive Fire participate in the passive fire protection of your building as early as possible, so you can rest assured. Taking protective measures to protect your building and the people in it from the threat of fire is a legal obligation. By letting us work with you from the design stage of your construction project, Tech Passive Fire can ensure that the work is done quickly and efficiently with the highest quality in the industry. Tech Passive Fire's intumescent paint and coating services are in compliance with the committee's passive fire protection regulations. We are a member of the New Zealand Fire Protection Association and we are proud of this. For more information about our passive fire protection solutions, please visit our website now.

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