The expansion characteristics of expandable graphite flake are different from other expansion agents. When heated to a certain temperature, the expandable graphite begins to expand due to the decomposition of the compounds trapped in the interlayer lattice, which is called the initial expansion temperature. It expands completely at 1000℃ and reaches its maximum volume. The expanded volume can reach more than 200 times of the initial volume, and the expanded graphite is called expanded graphite or graphite worm, which changes from the original scaly shape to the worm shape with low density, forming a very good thermal insulation layer. Expanded graphite is not only the carbon source in the expansion system, but also the insulation layer, which can effectively insulate heat. It has the characteristics of low heat release rate, small mass loss and less smoke generated in fire. So what are the characteristics of expandable graphite after it is heated into expanded graphite? Here’s the editor to introduce it in detail:
1, strong pressure resistance, flexibility, plasticity and self-lubrication;
2. Extremely high and low temperature resistance, corrosion resistance and radiation resistance;
3. Strong seismic characteristics;
4. Extremely high conductivity;
5. Strong anti-aging and anti-distortion characteristics;
6. It can resist the melting and infiltration of various metals;
7. Non-toxic, without any carcinogen, and no harm to the environment.
The expansion of expandable graphite can reduce the thermal conductivity of the material and achieve the flame retardant effect. If the expandable graphite is directly added, the carbon layer structure formed after combustion is definitely not dense. Therefore, in industrial production, expandable graphite should be added, which has good flame retardant effect in the process of being converted into expanded graphite when heated.
Post time: Jan-04-2023