What does expandable graphite do?
Flame retardant agent
Flame retardant is one of the most important uses of expandable graphite. Exposed to heat, expandable graphite expands creating an expansion layer at the material’s surface. This helps to slow down fire spreading and reduces danger from smoke and toxic gases.
Expanded graphite can also be compressed to create foil. These can be used to make radiators, seals, or radiators which are resistant to heat and chemical.
Expandable Graphite for Metalurgy
The use of expandable graphite in metalurgical to cover melting and moulds is another reason. It is also used in metallurgy as an insulator or oxidation protectant.
Expandable Graphite for Chemical Industry
Expandable graphite can be used in paints or varnishes.
Make graphite more expandable.
Natural graphite is treated with acid and an oxidant bath to make expandable graphite. The most common oxidants used are potassium permanganate, hydrogen peroxide or chromic acids. For the addition of a compound, concentrated sulfuric or nitric is used. This reaction occurs at temperatures between 30°C and 130°C for about 4 hours. The reaction is complete and the flakes must be rinsed off with water before being dried. The graphite’s production conditions as well the particle size will affect both the temperature of the initial and subsequent expansion. The graphite’s fineness determines the temperature and the expansion rate.
What three kinds of graphite are there?
Graphite comes in two forms: synthetic graphite (natural graphite) and regular graphite.
Three types of natural graphite exist. All three are made of graphite of natural origin. The three main forms of natural graphite are flake graphite (amorphous), flake graphite (crystalline veined) and crystalline-veined graphite. They all have unique properties that make them suitable for specific applications.
Why is expandable graphite so important?
Graphite’s layered structure allows for molecules to be interwoven between its layers. As intercalation agents, sulfur compounds and nitrogen compounds are often used. The heat causes these layers to separate and then the graphite sheet expands.
Graphite powder Price
Price is affected by many things, such as the demand and supply in the market and industry trends. Economic activity and market sentiment are also important.
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