ASTM D91 - 02(2012)

    Standard Test Method for Precipitation Number of Lubricating Oils

    Active Standard ASTM D91 | Developed by Subcommittee: D02.06

    Book of Standards Volume: 05.01


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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)

    UNSPSC Code

    UNSPSC Code 15120000(Lubricants and oils and greases and anti corrosives)


    DOI: 10.1520/D0091-02R12

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