D91-97
Standard Test Method for Precipitation Number of Lubricating Oils

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.  The precipitation number is the number of milliliters of precipitate formed when 10 ml of sample oil are mixed with 90 ml of precipitation naphtha and centrifuged at 1,500 rpm under prescribed conditions.

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