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.
If there are conditions, you can also make a preliminary inspection on the quality of the product: cut 2 to 3 small samples on the already constructed substrate, or take a small amount of sample on 2 to 3 150mm × 150mm plywood, press Brush the actual construction. After drying, check with the flame of the alcohol lamp. The flame height is about 40mm, and the time for applying the flame is generally 20min, and the coating foaming condition is checked. Under normal circumstances, according to the specified dosage (usually 500 g / square meter), the foam layer thickness of the first-grade fireproof coating is 20mm or more, and the foam layer thickness of the secondary fireproof coating is 10mm or more, and the foam layer should be even and dense.
In actual use, in order to ensure the fireproofing and other performance of fireproof coatings, a transparent overcoat is generally required. The amount of fireproof coating is generally 350-500 g/m2, and the amount of overcoat is generally 50 g/m2.
The application of fire retardant coatings has gradually expanded with the development of science and technology as the industry has become more clustered and high-rise. In the past, the focus was on preventing the burning of warehouses, ships, etc. High requirements can withstand higher temperatures and extend longer times while keeping the bottom layer temperature in a lower range. However, as a new type of paint, fire retardant coatings also have some shortcomings, such as high cost, and the physical properties of some varieties of fire retardant paints are not ideal. At present, the variety of fire retardant coatings is still increasing, and it is believed that the market prospect is broad.
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