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The softening point apparatus is used to determine the temperature at which bituminous coal starts to soften. A ring of bituminous coal is cooled for 30 minutes and then heated in a water bath, with the temperature noted when a ball first passes through the softened ring. The test is repeated with a second ball to confirm the softening point temperature, providing an indication of when road deterioration may start for that type of coal.

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vexnaxia

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EN