The appearance of fireproof coatings is very similar to that of ordinary paints. It is difficult to distinguish them from the appearance, and it is difficult to check the quality of fireproof coatings on site. In actual projects, fire control departments at all levels can identify them by the following methods:
Check whether the product has a qualified inspection report issued by a national fire quality inspection center, or you can check it online. At present, fireproof coatings implement the type approval system for fire protection products. The fireproof coatings sold on the market should have the national fire protection product type approval certificate and the type inspection qualification report.
According to national standards, in addition to meeting the fire resistance requirements, the fire performance of fire retardant coatings is divided into first and second grades. Under the specified experimental conditions, the first-class fireproof coating has a flame resistance time of not less than 20 minutes, and the secondary fireproof coating has a heat resistance time of not less than 10 minutes. Users should pay attention to the difference in the choice, to avoid the company shoddy, can not achieve the fire protection effect.
The on-site construction of fire-retardant coatings shall be based on the manufacturer's product packaging instructions. Generally, it is not required to be diluted with water. When painting, it should be divided into two or more times, and the amount of painting should be no less than 500 g/m2. When the fireproof coating is diluted with water or the amount of coating is insufficient, it will have a great impact on its fire performance. The fire department should strengthen the supervision of the construction site to prevent the construction company from cutting corners.
When the qualified fireproof coating is burned by a strong flame such as a blowtorch, it will foam and expand a lot, the surface will gather and bulge, and there will be no burning phenomenon within a few minutes, while the fake and shoddy fireproof coating will not foam at all, and a large amount of scattered will occur. In the case of slag, the wood substrate will also quickly burn and break.
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