ASTM D6875-12 Test Method for Solidification Point of Industrial Organic Chemicals by Thermistor

ASTM D6875-12 method is used to measure the solidification point of most organic chemicals by using a thermistor. The maximum temperature at which the liquid phase of a substance is in appropriate equilibrium with a relatively small portion of the solid phase is noted in the result.

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    ASTM D6875-12 method applies to pure compounds only, as impurity concentrations lower the solidification point. The method determines the solidification points of most organic chemicals having appreciable heats of fusion and temperature between 4 and 41°C. 

    Test Procedure:

    ASTM D6875-12 methods require a cooling medium to achieve a solidification point between 4 to 30°C. The sample container with the two-hole stopper is closed. The thermistor is inserted in one hole and the agitator shaft in another hole.The bath temperature is set 5 ±1°C below the expected point of solidification of the sample. 

    Solidification Point Apparatus Set Up

    Specimen size:

    A Sample container, with a thick-walled outer tube with a diameter of 18 mm, an inner diameter of 14 mm, and a length of 150 mm.


    Temperature Bath is required to control at 5±1°C below the expected solidification point.

    Thermistor, in stainless steel housing with resistance greater than 2k ohms at 25°C and the calibration accuracy is ± 0.01°C.


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