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Correct and accurate softening point measurements depend upon reliable instruments. Learn how to achieve compliant pitch measurements according to ISO 5940-2. |
Importance of the Softening Point of Pitch
Pitch is a shiny, black residue obtained by distillation of coal tar, which is produced as a byproduct during manufacturing of metallurgical coke. It is used as a base for coating and paint, in roofing and paving, and as binder in the manufacturing of carbon and graphite electrodes.
Softening point determination is one of the few methods available to thermally characterize pitches. The ISO 5940-2:2007 standard specifically specifies a method to determine the softening point of pitches by the Mettler method.
Softening Point Measurement Principle
The softening point measurement principle is based on the detection of the elongation of the substance of interest. Samples of coal tar pitch are heated until they transform from a solid to a liquid state. The softening point is the temperature at which a substance has flown a certain distance under defined test conditions.
In order to force the precipitation of the softened sample from the cup when heated, the sample can be weighted with a ball of standardized dimensions.
In this application note, you will learn about the sample preparation steps and softening point measurement according to ISO 5940-2:2007 using the METTLER TOLEDO Dropping Point instruments.
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