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ASTM D938-05

Historical Revision

Standard Test Method for Congealing Point of Petroleum Waxes, Including Petrolatum

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1.1 This test method covers determination of the congealing point of petroleum waxes, including petrolatum.

1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

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.

Note 1—This test method is an alternative to Test Method D 127. Results obtained are usually lower than the results obtained by Test Method D 127 - IP 133, the amount of the deviation varying with the nature of the petroleum wax.


Congealing point is a wax property that is of interest to many petroleum wax consumers. The procedure described here measures the temperature at which a sample being cooled develops a set or resistance to flow. At that temperature, the wax may be at or close to the solid state, or it may be semisolid and quite unctuous, depending on the composition of the wax or petrolatum being tested. In the case of petrolatums, congealing property is associated with the formation of a gel structure as the sample cools.

SDO ASTM: ASTM International
Document Number D938
Publication Date Nov. 1, 2005
Language en - English
Page Count 3
Revision Level 05
Supercedes
Committee D02.10.0A
Publish Date Document Id Type View
Dec. 1, 2012 D0938-12 Revision
Nov. 1, 2005 D0938-05 Revision
May 1, 2004 D0938-04 Revision
July 10, 1998 D0938-92R98E01 Revision
Not Available D0938-71R81 Revision
June 1, 2017 D0938-12R17 Reaffirmation
July 10, 1998 D0938-92R98 Reaffirmation