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Graphite is a conductor, and can be used, for instance, as the material in the electrodes of an electrical arc lamp. This petroleum product is considered to be the highest grade of coal, just above anthracite, although this graphite mineral is not normally used as fuel because it is hard to ignite. In its pure glassy (isotropic) synthetic forms, pyrolytic graphite and carbon graphite is an extremely strong, heat-resistant (to 3000 °c) material, used in reentry shields for missile nosecones, solid rocket engines, high temperature reactors, brake shoes, electric motor brushes and as electrodes in edm electrical discharge machines. Expandable graphite is used in firestops, particularly plastic pipe devices, as well as gaskets, fitted around the perimeter of a fire door. During a fire, the graphite intumesces (expands and chars) to resist fire penetration and reduce the likelihood of the spread of fire and fumes. This chemical compound is the most widely used product in the industries of various kind.
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