Flexible graphite, also known as expanded graphite, uses scale graphite as raw material and undergoes chemical treatment to produce interlayer compounds. At a high temperature of 800-1000 ° C, the interlayer compound becomes a gas, which expands the flake graphite by about two hundred times. It becomes like cotton heat conduction and other advantages, overcomes the shortcomings of brittleness, and thus shows good sealing. Loose and porous, full of elasticity. Working under high temperature, high pressure or radiation conditions, without decomposition, deformation or aging, chemical stability. The birth of
flexible graphite declares the end of the old-fashioned era in the field of chemical sealing. Compared with asbestos gaskets,
flexible graphite has the following obvious advantages:
1.No radiation and no pollution.
Flexible graphite does not contain harmful ingredients to human body, but asbestos products are harmful to human body and can also pollute the environment.
2. High temperature resistance. The flexible graphite-reinforced composite gasket can withstand a high temperature of 1650 ° C. Even if the chemical equipment is melted, it is still safe. When the asbestos products are at 500 ℃, the internal crystallization water will be decomposed, so that they will pulverize and lose their effectiveness.
3. Wide scope of application. In addition to strong oxidizing acids, flexible graphite can withstand most chemical media, including those used in radioactive chemicals, while asbestos products have poor adaptability and cannot be used in radioactive media. Some chemical towers, heat exchangers, etc. require that the connection parts are not insulated, flexible graphite can do it, and slate products cannot.
4. Easy and fast to use. The gasket factor of flexible graphite is only half of that of asbestos products, that is to say, to achieve the same sealing effect, the force of tightening the screws can be much smaller. In addition to the above-mentioned obvious characteristics, flexible graphite also has the characteristics of excellent sealing performance, compressibility, good elasticity, and oxidation resistance. It has strong self-lubricity and plasticity, and has good electrical conductivity, large specific gravity, and high density. Features, can make various adjustments for diesel engines, compressors and other various pipelines, flange gaskets, etc.
