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A graphite tube is a cylindrical tube made of graphite, a form of carbon. It is commonly used in various applications, including in the manufacturing of electrodes, heat exchangers, and crucibles. Graphite tubes are known for their high thermal conductivity, low thermal expansion, and excellent chemical resistance. These properties make them suitable for use in high-temperature environments, such as in furnaces and reactors. In analytical chemistry, graphite tubes are used in graphite furnace atomic absorption spectrometry (GFAAS) and graphite furnace atomic absorption spectroscopy (GFAAS) techniques. In these techniques, the graphite tube serves as the sample holder and is heated to high temperatures to atomize and vaporize the sample for analysis. Overall, graphite tubes have a wide range of applications due to their unique combination of properties, making them a versatile material in various industries.