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ASTM D91-24

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Standard Test Method for Precipitation Number of Lubricating Oils

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1.1 This test method covers the determination of the precipitation number of steam cylinder stocks and black oils, and can be used for other lubricating oils.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


4.1 Fully refined petroleum oils normally contain no naphtha-insoluble material. Semirefined or black oils frequently contain some naphtha-insoluble material (sometimes referred to as asphaltenes). This test measures the amount of naphtha-insoluble material in the oil. This quantity is reported as the precipitation number.

SDO ASTM: ASTM International
Document Number D91
Publication Date Nov. 1, 2024
Language en - English
Page Count 3
Revision Level 24
Supercedes
Committee D02.06
Publish Date Document Id Type View
Nov. 1, 2024 D0091-24 Revision
Nov. 1, 2012 D0091-02R12E01 Revision
June 10, 2002 D0091-02 Revision
Dec. 10, 1997 D0091-97 Revision
May 1, 2019 D0091-02R19 Reaffirmation
July 1, 2017 D0091-02R17 Reaffirmation
Nov. 1, 2012 D0091-02R12 Reaffirmation
May 1, 2007 D0091-02R07E01 Reaffirmation
May 1, 2007 D0091-02R07 Reaffirmation