Fire-resistant Preparation
Fire resistant materials are designed to resist burning, deformation or destruction under high temperatures. The most commonly used fire resistant materials are intumescent coatings, which are used to provide fire protection for the steel structure of buildings, frames and components in a variety of applications. To maximise the effectiveness of intumescent coatings, it is important to ensure that all surfaces are dry, clean and free from dust and other contaminants before the application. To achieve this, a comprehensive preparation process is essential.
When preparing a surface for the application of an intumescent coating, it is important to consider factors such as porosity, surface roughness, temperature, humidity and the type of substrate being used. It is essential to identify and remove any contaminants that may prevent the application of the coating, or interfere with its performance. This can be done through the use of a variety of cleaning methods, including power washing, scrubbing, sanding and chemical cleaning. Degreasing and etching may also be necessary in certain cases. It is also important to ensure that any surfaces requiring a primer are prepared correctly in order to ensure good adhesion and a consistent finish.
Once the surface has been cleaned and prepared, it is important to check the porosity, roughness and other characteristics of the substrate to ensure they are suitable for use with intumescent coatings. In general, a flat and level surface is required, with a minimum surface profile of 1.6 millimetres. If any variations in the surface profile are detected, an additional primer may need to be applied before the coating is applied.
In order to ensure the highest performance from intumescent coatings, it is essential that the coating is correctly applied according to the manufacturers instructions. This involves ensuring that a uniform layer of the coating is applied using either spray, brush or roller techniques. The intumescent coating should be applied at an even temperature to ensure it cures correctly. An ambient temperature of between 15 and 25 degrees Celsius should be maintained.
The application of intumescent coatings can be complicated and time consuming, which is why it is important to have a comprehensive preparation process in place before beginning. The success of the final installation largely depends upon the quality and integrity of the substrate, so it is essential that the correct cleaning and preparation techniques are used to ensure the highest standards of fire resistance.
