Fire-resistant coatings for steel structures play a very important role in the construction of steel structures, because steel structural members themselves do not have fire resistance performance. China's current standards and regulations have made clear provisions for the classification and quality of steel structures and fire-resistant coatings. Thin and insurance and thick fire-resistant coating products are classified and inspected.
The test results are tested from the coating thickness and the fire resistance test time, so we can classify fire-resistant coatings. If they are classified according to the place of use, they can be divided into indoor or concealed engineering steel structure surfaces and used in construction. Steel structure surface for outdoor or open-air works.
Steel structure fireproof coatings can also be classified according to thickness. They can be divided into ultra-thin steel structure fireproof coatings. The thickness of this coating is less than or equal to 3 mm. Millimeters, but less than 7 millimeters, and then a relatively thick rear fireproof coating for steel structures, whose coating thickness is greater than 7 millimeters and less than or equal to 45 millimeters.
There are many factors that affect the quality difference of steel structure fireproof coatings. For different coatings manufacturers, the raw materials, production processes and formulations of the products have a certain impact on the quality of the products. In addition, even the same manufacturer, due to different There are also slight quality differences between batches of products.
Fire-resistant coatings are mainly divided into ultra-thin, thin and thick. The thickness of the thin coating is generally within 3mm, and the decorative effect is also good. The reason why this material is fireproof is that it can expand and foam at high temperatures. Can increase the fire resistance limit to 2 hours. The thickness of fire-resistant coatings for thick steel structures is required to be greater than 7mm and less than 45mm. The granular side of this material has a small density, low thermal conductivity and a fire resistance of more than 2 hours.
The fire resistance time of the fireproof coating and the coating thickness of the fireproof coating are proportional in a certain stage. The fireproof time of the same fireproof coating is different due to the different thicknesses. But beyond a certain limit coating thickness and fire resistance time will be unbalanced. Therefore, it is very important to measure the thickness of the fire-resistant coating with a fire-resistant coating thickness gauge.
Usually we use Linshang LS223 fire-resistant coating thickness gauge to check the thickness of the fire-resistant coating. This coating thickness gauge is equipped with two probes F3N3 and F5N3. Users can choose the coating thickness gauge that suits them according to the size of the coating thickness they measure. The instrument uses the nondestructive measurement principle of the Hall effect and eddy current effect, which will not cause damage to the coating surface.
When spraying steel structure fire-resistant coatings, we must select the corresponding soil layer thickness and construction technology according to the fire resistance limit of the component to achieve the fire-proof effect.