The moisture content of the base layer during the construction of the fireproof coating is too high; the top coat uses a high-grade paint or a solvent-based paint with a high emulsion content, and the formed coating film is too dense, and the moisture cannot be discharged.
First of all, the moisture content of the base layer during the construction of the fireproof coating is too high; the top coat uses a high-grade paint or a solvent-based paint with a high emulsion content, and the formed coating film is too dense, and the water cannot be discharged. The bottom layer uses a water-based fireproof coating, while the top layer coating uses a solvent-based fireproof coating when the sun is directly exposed and the temperature of the coating film is too high. The bottom layer uses a poor quality putty that is not water resistant, and moisture penetrates into the base layer to lose adhesion between the coating film and the base layer. When the tunnel is constructed, the interval is too short and the moisture or solvent has not completely evaporated. After the fireproof coating is applied, the coating film will not rain completely, and the film will be exposed to rain or dew for a long time. Secondly, in the prevention of solvent-based fireproof coating, the moisture content of the base layer should be no more than 8%. When the underlying fireproof coating is not completely dry, apply solvent-based fireproof coating. Avoid direct sunlight when painting. The outer wall must choose a putty with good fire resistance. Be sure to apply the next fire retardant coating after the coating is dry. Avoid weather construction with heavy air relative humidity in rainy days.
Finally, the repair method: if it is foaming, remove the foaming part, smooth the edges of the removed part, and re-prime the primer and topcoat. If it is overall foaming, all parts of the foaming must be removed, and the primer and topcoat should be applied after re-patching the wall.
This article is from Wuhan Xinghai Fire-fighting Materials Co., Ltd. http://, please indicate the source.
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Extrusion is a metal forming process , in which billet is passed through a die , to get required cross section of component .
Non cutting process
Production of Fixed cross section
Types of extrusion process
Direct extrusion process
Indirect extrusion process
Impact extrusion process
Hydrostatic extrusion process
Tube extrusion process
Extrusion Die Abutment,Nickel Based SuperAlloy Rene 88,Rene 88 Extrusion Die Abutment,Nickel Based SuperAlloy
Shenyang Top New Material Co., Ltd. , http://www.topcobalt.com