Expandable Graphite
Size
0.50mm or 0.106mm, etc
Package
25 kg small bags into ton bags
Origin
China
Features
Preservative/Electrical and thermal conductivity, etc.
Application
Fireproof sealing element, flame retardant, refractory brick, etc.
Expandable graphite crystal is a typical layered carbon material. Other heterogeneous particles such as atoms, molecules, ions, and even atomic clusters are inserted into the interlayer of crystalline graphite by physical or chemical methods to form a new layered compound, which is called graphite interlayer compound, namely expandable graphite.
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The graphite crystal has a hexagonal net planar layered structure composed of carbon elements. The carbon atoms in the layer plane are bound by strong covalent bonds, while the interlayer is bound by van der Waals force, which is very weak and the interlayer distance is large. Therefore, under the appropriate conditions, acid, alkali metals, salts, and other chemicals can be inserted between Graphite layers, and carbon atoms combined to form a new chemical phase — Graphite Intercalation on Compounds (GIC). This interlaminar compound, when heated to the right temperature, breaks down instantly and rapidly, producing a large amount of gas that causes the graphite to expand along its axis into a new, worm-like substance called expanded graphite. This unexpanded graphite interlaminar compound is expandable graphite.
Franli expandable graphite can be used in the seal material because expandable graphite sealing material is high carbon graphite materials will be mixed with sulfuric acid, nitric acid acidification processing, heat treatment after forming, the preparation of flexible graphite is a kind of new high-performance sealing materials, is a kind of in-situ growth of nanomaterial. Compared with asbestos rubber and other traditional sealing materials, it has good compressibility, resilience, self-bonding, low density, and other excellent properties, and can be used for a long time under harsh working conditions such as high temperature and high corrosion. Graphite sheet and sealing elements produced by it are widely used in aerospace, machinery, electronics, nuclear energy, petrochemical, electric power, shipbuilding, smelting, and other industries. Because it has lightweight, electricity, heat conduction, high-temperature resistance, acid and alkali corrosion resistance, good resilience, lubricity, plasticity, chemical stability, and other excellent characteristics, known as the world “the king of sealing”.
Moreover, Franli’s expandable graphite also has an excellent performance in environmental protection materials. Because the expandable graphite obtained by high-temperature expansion in the field of environmental protection has a rich pore structure and excellent adsorption performance, it has a wide range of uses in environmental protection and biomedical. The pore structure of expandable graphite has two kinds of open holes and closed holes. The pore volume accounts for about 98%, the pore size is mainly large, and the pore size distribution ranges from 1 to 10.3 nm. Because it is mainly macroporous, mesoporous, it is different from activated carbon and other microporous materials in adsorption characteristics. It is suitable for liquid adsorption, but not for gas adsorption. It is oleophilic and hydrophobic in liquid phase adsorption. 1 g expandable graphite can adsorb more than 80 g of heavy oil, so it is a promising environmental protection material for cleaning water surface oil pollution. In the wastewater treatment of chemical enterprises, microbial (bacterial) treatment is often used. Expandable graphite is a good carrier of microorganisms, especially in the water treatment of oil and fat organic macromolecule pollution. Because of its good chemical stability and renewable reuse, it has a good application prospect.
The above are just some of the application fields of expandable graphite. Franli’s expandable graphite is used in various industries and has received an excellent evaluation, the quality is very good, and the price is appropriate. If you are interested, please contact us.
