The paint that protects against fire on metal is a special paint to enhance fire retardant properties of metal structures in case of exposure to fire. The paint applied to the metal, when exposed to high temperatures, swells, thereby preventing air from getting to the rod, which prevents the spread of fire throughout the structure.
The effectiveness of fire resistance largely depends on the thickness of the applied layer paint. When exposed to open fire on a metal structure, the resistance can last up to 1.5 hours.
Note: The larger the layer of paint applied to the metal, the higher the fire retardant properties ...
Neomid is one of the well-known and earned a name in our country for increasing the level of fire resistance of metal structures.
You can also highlight the water-based paint from Nertex.
And one cannot fail to mention another well-known manufacturer Aquest 911, designed to increase the level of fire resistance up to 90 minutes.
Fire retardant paint is used in mechanical engineering, nuclear industry, in hydraulic engineering, in military-construction complexes, etc. It is used in the processing of structures made of metal for industrial and civil purposes, for rooms that have a non-aggressive environment with low humidity up to eighty percent.
Important : If the structure is operated at a humidity of more than eighty percent, with temperature fluctuations, in an aggressive environment, a protective coating layer.
Fire retardant paint has the following properties:
Theoretical consumption and paint thickness determined based on the indicators the thickness of the metal device and its fire resistance. For example, when a structure with a thickness of 3.4 mm is heated to a maximum temperature of five hundred degrees Celsius with a consumption of 1.45 kg / m2 and a dry layer thickness of 0.82 mm, the fire resistance limit is will be 46 minutes, and with a metal thickness of 5.
8 mm, a consumption of 2.70 kg / m2 and a dry layer of 1.80 mm, 91 minutes.
At practical consumption, technological losses of 5-20% are taken into account. This indicator depends on the method of processing the structure, on the application technique, on the conditions in which the work was performed.
For example, when air spraying paint on metal at 80% humidity and temperature + 10C, the coating dries up to 32 hours. At + 20C -24h, at + 30C -20h.
Important: Drying time between application of layers should be at least three hours in conditions of humidity not exceeding eighty percent and temperature plus twenty degrees.
The paint is available in white and matte colors. Color can be used, but provided not in excess of three percent of the total mass of the paint.
The first step is to prepare the surface. This stage is carried out in accordance with SNIP. The metal surface is cleaned from various dirt and rust. This can be done either mechanically or manually using a metal brush or sandpaper.
Next, the cleaned metal structure is degreased with a special solvent or detergent .
Before the paint, a primer is passed over the surface. It can be GF-021, Yankop-02, etc. Primers based on epoxy, acrylic, polyurethane or vinyl chloride binders can also be used. The primer should be more than 50 microns thick and dry within 24 hours.
Before applying the paint directly, it must be kept at a temperature of 20 degrees 20 hours.
Then it is mixed until smooth. Also, if necessary, it is diluted with xylene or toluene, but not more than three percent of the total weight.
Paint can be applied with paint brushes, roller or airless spray.
This unit must have the following characteristics:
Must have a working pressure of one hundred and eighty to two hundred and fifty atmospheres, a nozzle diameter of a nozzle from 0.45 to 0.
66 millimeters, a supply hose diameter of up to ten millimeters, and an angle spraying from twenty to forty degrees.
All cleaning filters must be removed from the device before painting. Painting should be carried out without any precipitation, temperature not less than five degrees and humidity not exceeding eighty percent.
The paint is applied in layers with periodic drying. As mentioned earlier, the drying time depends on the thickness of the applied layers and the external temperature conditions.
Note: The drying time is determined as the surface layer hardens.
After drying after 24 hours, a protective layer is applied to the paint to increase the refractory properties.
Quality must be carried out at each stage of painting control. During preparation the surface is checked visually. The quality characteristics of the dried coating are checked for integrity.
The wet layer is measured with a comb, and the thickness of the dry layer is measured with a magnetic thickness gauge with an error of no more than 0.01 mm. The thickness of the coating is measured along the entire length of the structure at intervals of one meter.
All violations revealed during the control must be eliminated in a strict sequence.
Once a year, a scheduled inspection of the coating for visible defects and a technical condition inspection report has been drawn up.
If defects were found, repair work of the coating is carried out.
Paint is a toxic substance, therefore, all kinds of work with this material should be carried out in well ventilated areas with a safe concentration level. All safety regulations must be followed. P Workers who apply paint must have appropriate protective equipment.
Paint can be transported by any transport.
Stored in closed containers.
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