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ASTM D36-06

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Standard Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus)

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1.1 This test method covers the determination of the softening point of bitumen in the range from 30 to 157°C (86 to 315°F) using the ring-and-ball apparatus immersed in distilled water (30 to 80°C), USP glycerin (above 80 to 157°C), or ethylene glycol (30 to 110°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.


Bitumens are viscoelastic materials without sharply defined melting points; they gradually become softer and less viscous as the temperature rises. For this reason, softening points must be determined by an arbitrary and closely defined method if results are to be reproducible.

The softening point is useful in the classification of bitumens, as one element in establishing the uniformity of shipments or sources of supply, and is indicative of the tendency of the material to flow at elevated temperatures encountered in service.

SDO ASTM: ASTM International
Document Number D36
Publication Date Dec. 1, 2006
Language en - English
Page Count 4
Revision Level 06
Supercedes
Committee D08.03
Publish Date Document Id Type View
Dec. 1, 2006 D0036-06 Revision
Not Available D0036-76 Revision
June 30, 2000 D0036-95R00E01 Reaffirmation