Transparent fire retardant coatings, also known as fire varnishes, are a type of facing fire retardant coating. Transparent fire varnish is a surface-type fireproof coating. This product is developed by introducing advanced foreign technology, new formula and new production technology. It is a special coating integrating decoration and fire resistance. Mainly used for fire protection of high-grade wood decorative materials and steel structure surfaces of buildings or structures. The products shall comply with the requirements of GB12441-1998 General Technical Conditions for Finishing Fire Resistant Coatings and GB14907-2002 "General Technical Conditions for Fire Retardant Coatings for Steel Structures".
At present, fireproof paints commonly used in China are inflated, mainly used for the surface of wooden decorative materials. When the surface of the object coated with fire retardant paint is in fire, the fireproof layer can rapidly expand and expand in a short time, delaying the development of the combustion condition.
The appearance of fire-retardant coatings is very similar to ordinary paints, it is difficult to distinguish them from the appearance, and it is difficult to check the quality of fire-retardant paints on site. In the experimental project, the fire supervision departments at all levels can identify them by the following methods.
1. According to national standards, in addition to meeting the fire resistance requirements, the combustion performance of fire retardant paint is divided into first and second grades. Under the specified experimental conditions, the flame retardant time of the first-grade fireproof paint is not less than 20min, and the flameproof time of the second-grade fireproof paint is not light rain for 10min. 2. Check whether the product has a qualified inspection report issued by the national fire quality inspection center, or you can check it online. At present, fire-retardant paints implement the fire-fighting product form approval system. The fire-fighting paints sold on the market should have the national fire protection product form approval certificate and the formal inspection conformity report.
3, the on-site construction of fire-retardant coatings should be based on the manufacturer's product packaging instructions, generally do not need to be diluted with water, brushing, the amount of brushing is not less than 500g / m2.
4. At present, domestic enterprises produce fire-retardant paints with fire resistance up to two grades. The cost price is above 8,000 yuan/ton. If the sales volume is lower than this, the quality is worrying.
5. In actual use, in order to ensure the fireproofing and other performance of fireproof paint, a transparent overcoat is generally required. The amount of fire retardant paint is generally 350~500g/m2, and the amount of overcoat is generally 50g/m2. Buy a house, buy a house, decorate a forum, real estate forum 6x5u.] 4x (i
6. A preliminary inspection of the quality of the product can be done on site: two or three small samples are cut on the already constructed substrate, or a small amount of sample is applied to the plywood and painted according to the actual construction conditions. Under normal circumstances, according to the specified dosage (usually 500g/m2), the foam layer thickness of the first-grade fire retardant paint is 20mm or more, and the foam layer thickness of the second-grade fireproof paint is 10mm or more, and the foam layer should be uniform and dense. After drying, check with the flame of the alcohol lamp.
When fireproof paint is burned by strong fire, it will foam and expand a lot, the surface will gather up, and there will be no burning phenomenon within a few minutes, while the fake and shoddy fireproof paint will not foam at all, and there will be a lot of scattered slag. Wood substrates can also quickly burn and break.
Niobium is a shiny gray metal with paramagnetism and belongs to Group 5 on the periodic table. High Purity Niobium has high ductility, but hardens as the amount of impurities increases. Its outermost electron-layer arrangement is very different from other Group 5 elements. The same phenomenon occurs on the front and back ruthenium (44), rhodium (45) and palladium (46) elements.
Z element number of electrons per layer
23 Vanadium 2, 8, 11, 2
41 Niobium 2, 8, 18, 12, 1
Tantalum 2, 8, 18, 32, 11, 2
105
Niobium
Niobium Oxide,Pure Niobium Wire,Pure Niobium,Niobium Anodized Wire
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