According to NPB 236-97, fire protection of metal is a surface treatment of metal structures with special fire retardant materials that inhibit heating of the metal and as a consequence, prevent its deformation during a fire. In today's market there are many fire-proof materials materials intended for fire protection of steel structures, but the most widely-used and still are fire-retardant paints and Plastering retardants. We consider each of them. Fire-retardant paint. One of the most modern and relevant today form the material for fire protection of metal.
The action of fire retardant paint is based on intumescent effect. When reaching high temperatures, fire-retardant paint swells, forming an insulating foam layer. Fire-retardant paint is a type of thin-film coatings, the middle layer of this coating is 1-1.5 mm. and the average flow rate of 1.8-2.0 kg. The paint can withstand mechanical stress, vibration, and does not alter the configuration of the treated structure. Plus is the way of application, paint can be applied even brush or roller.
Disadvantages include only the high cost and inability to use the colors when necessary to ensure a high fire resistance. Plaster flame retardant. Given type of material applied to the metal surface with a thick layer of plaster with the help of machines. Manual application is not allowed. Coating can not withstand mechanical stress and is recommended for use only in cases where the processed metal "sutured" decorative materials. The disadvantage is the amount of raw material, which is an average of 5.10 kg. per 1 square meter, which increases the costs of the application and creates additional burden on the metal. With some flame retardants are necessary to carry out reinforcement. On the one hand it is a big plus, because in reinforcing the coating becomes more Hard on the other, it greatly complicates the process of application, as fastening to metal reinforcing mesh made by welding. The advantage of using plaster retardants is their value, they are significantly cheaper fireproof paint. It should also be noted that the use of this method of fire protection can be achieved any fire rating.