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ASTM D3104-14

ASTM D3104-14

Standard Test Method for Softening Point of Pitches (Mettler Softening Point Method)

2014-11-12 /Historical
Superseeded by:
Significance and Use:

4.1 Pitch does not go through a solid-liquid phase change when heated, and therefore does not have a true melting point. As the temperature is raised pitch gradually softens or becomes less viscous. For this reason, the determination of the softening point must be made by an arbitrary, but closely defined, method if the test values are to be reproducible.

4.2 This test method is useful in determining the consistency of pitches as one element in establishing the uniformity of shipments or sources of supply.


1.1 This test method covers the determination of the softening point of pitches having softening points in the range from 50 to 180°C by this test method, and gives results comparable to those obtained by Test Method D2319 above 176°F (80°C).

1.2 The values stated in SI units are to be regarded as the standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Mettler; pitch; softening point
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