ASTM-D91 › Historical Revision Information
Standard Test Method for Precipitation Number of Lubricating Oils
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Scope
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 acceptable 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.
Significance and Use
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.
Keywords
asphaltenes; lubricating oils; precipitation number ;
To find similar documents by ASTM Volume:
05.01 (Petroleum Products and Lubricants (I): D56 - D3710)
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Document Number
ASTM-D91-02(2012)e1
Revision Level
2002 R12(E1) EDITION
Status
Superseded
Modification Type
Editorially changed
Publication Date
Aug. 1, 2016
Document Type
Test Method
Page Count
3 pages
Committee Number
D02.06