Fire-resistant Coating Application and Fire Resistance
1. The role and principle of fire protection coating
The fire-resistant coating is a special coating used on the surface of flammable substrates, which can reduce the flammability of the coated material surface and block the rapid spread of fire to increase the fire resistance of the coated material. It is applied to the flammable substrates surface to change the burning characteristics of the material surface and prevent the rapid spread of fire; or it is applied to building components to improve the fire resistance limit of components, called fire-resistant coatings. Flame retardant or non-combustibility, so that the protected substrate is not in direct contact with the air, delaying the ignition of the object and reducing the burning speed.
In addition to being non-flammable, the fire-resistant coating also has a low thermal conductivity, which can delay the transfer of flame temperature to the protected substrate. The fire-resistant coating decomposes into a non-combustible inert gas, which is diluted and protected. Combustible gas decomposed by objects to make it difficult to burn or slow down. Nitrogen-containing fire-resistant coatings decompose on heating to form groups such as NO and NH3, which combine with organic free radicals to interrupt chain reactions, reduce temperature. The fire-resistant coating expands and foams when heated, forming a carbonaceous foam insulation layer to seal the protected object, delaying the transfer of heat to the substrate.
2. The fire resistance of fire-resistant coatings
The thicker the coating layer of the fire-resistant coating, the better its fire resistance? Generally speaking, for non-intumescent fire-resistant coatings, it depends on its own flame retardant and non-combustibility to stop the flame. Therefore, the thicker the fire-resistant coating, the thicker a glaze formed at high temperature. The heat-insulating effect of the fire-resistant coating will also be improved. For intumescent fire-resistant coatings, the fire-resistant coating is thicker. At the same time, [NO], [NH3], etc. that are partially decomposed by nitrogen-containing fire-resistant coatings. Therefore, from the perspective of improving the fire resistance performance, the thicker the coating, the better.
3. Application and selection of fire protection coating
Fire-resistant coatings can be widely used for fire-proof works of indoor wooden structures in public places such as hotels, restaurants, auditoriums, hospitals, computer rooms, shopping malls, automobiles, industries, dance halls and other public places.
Therefore, we can purchase some instruments for testing fire-resistant coatings, such as the painting thickness meter developed by Linshang Technology Co., Ltd. We can test the parameters of the fire-resistant coatings to see if they meet national standards.
It is recommended to use Linshang LS223 painting thickness meter to measure the thickness of the fire-resistant coating. The LS223 painting thickness meter use ruby probe. The measurement principles are the Hall effect and the eddy current effect. The test range is 0-5000μm. The measurement accuracy is high and the instrument can pass the test of the Chinese National Metrology Institute. The instrument can also automatically identify substrates and switch quickly. It is very easy to use. It is your best choice for thickness measurement of fire-resistant coatings. Choose it if you want to measure fire-resistant coatings.
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