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Thermal conductivity of graphite

Graphite has excellent thermal conductivity combined with high-temperature resistance. Graphite does not have a melting point; it changes from the solid state directly into the gaseous state. This process is called sublimation. Graphite becomes plastically deformable in an inert gas atmosphere starting at 2500 °C. At temperatures above 3750 °C, Graphite sublimates even without oxygen. Graphite is one of the most chemically resistant materials. It is resistant to almost all media of organic chemistry. These typically include the intermediate and end products in the petrochemicals, coal refining, plastics industry, paints, coatings, refrigerants, antifreeze, and cosmetics and food industries. Graphite is also resistant to most inorganic media, such as non-oxidizing acids, alkalis, aqueous salt solutions, and most technical gases. Graphite occurs naturally on Earth but can also be produced synthetically. Natural Graphite is mainly mined in China, India, Brazil, Mexico, and Ukraine, both underground and above ground. The production process of synthetic Graphite, on the other hand, is very complex – but simultaneously offers the possibility of modifying the properties of Graphite as desired. Flexible Graphite – expanded or exfoliated Graphite – is produced from purified natural graphite flakes. In manufacturing, the flakes are mixed with a highly oxidizing acid to produce graphite intercalation compounds. A sudden application of high temperature expands these. The resulting product, called expanded Graphite, is mechanically compressed into shaped products, mainly graphite foil. Although still showing the unique properties of natural Graphite, e.g., its excellent conductivity, expanded graphite foil is also flexible, soft, and easy to process in contrast to the raw material. If you are looking for high quality, high purity, and cost-effective Graphite, or if you require the latest price, please feel free to email contact mis-asia.

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