Product Characteristics

• Tunnel fire-resistant coating is a product developed by our company to be applied onto the inside of industrial and civil buildings and onto the concrete surface of highways and railways (including metros). In the case of fire, a fire-resistant and thermal insulating layer can be formed to improve the fire resistance limit of structures. 

• This product is non-toxic, odorless and contains no hazardous substances, and its fire resistance performance is extraordinary. It is an environment-friendly and fire-resistant coating. 

Product information

Basic Compositions ：

It is made from composite materials such as expanded vermiculite, high-strength binder, polypropylene fiber, heat-resistant material, thermal insulation material additive, etc. It does not contain volatile hazardous substances such as asbestos, formaldehyde, benzene, etc. 

Base treatment and construction method 

1. Before construction, dust and dirt on the concrete surface should be removed. If the concrete surface is too smooth, roughing can be performed on its surface. 
2. Base layer construction proportion: coating powder:supporting binder = 2:1. Accurately weigh powder, binder and appropriate amount of water, add them, mix them with a blender for over 10 min (the stirring time should be guaranteed, and the coating should be used up immediately after mixing), until it becomes thick slurry, spray with dead-weight spraying gun to make the coat thickness realize 2-3 mm and form a rough surface before layered construction. 
3. Layered construction should be performed after the base layer is basically dry (70%-80% dry). 

•  Proportion: coating powder:binder = 4:1, accurately weigh powder, binder and appropriate amount of water, add them, mix with the blender for over 10 min to make it become thick slurry; 
•  Spraying should be performed by using a coating machine (dead-weight spraying gun or extrusion pump) from the tunnel waist to the top (up-down), with each spraying layer thickness of 3-6 mm; 
•  The second time of spraying should be performed after the first time of coating is basically dry. Spraying is performed in this way, until the designed thickness is realized. The last time of spraying should not be too thick, and the coating should be compacted and smoothened. 

4. Surface decoration: if spraying construction is adopted, the coating appearance is even with granules and can adsorb sound. Usually, it is not troweled. When troweling is necessary, it should be performed in the last time of coating. When there are requirements for surface decoration, other decorative coatings may be sprayed (brushed) on the surface of the fire-resistant coating. 

Performance indicators 

• Fireproof performance: conform to GB14907-2018 Fire-resistant Coating for Steel Structure 

Storage and Transportation 

• The product should be stored in a dry, ventilated warehouse at the temperature above 5℃, in case of direct exposure to sunlight. 
• The shelf life should be six months. Anti-rain and anti-dampness measures should be taken for packaging and transportation.