ASTM D91 - 02(2012)e1
Standard Test Method for Precipitation Number of Lubricating Oils
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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.
1. 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
ICS Code
ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Referencing This Standard
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DOI: 10.1520/D0091-02R12E01
Citation Format
ASTM D91-02(2012)e1, Standard Test Method for Precipitation Number of Lubricating Oils, ASTM International, West Conshohocken, PA, 2012, www.astm.org
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