We perform lubricants quality testing by ASTM D91 to determine the precipitation number of steam cylinder stocks, black oils and other lubricating oils. Fully refined petroleum oils normally contain no naphtha insoluble material. Semi-refined or black oils frequently contain some naphtha insoluble material (also called asphaltenes). This test measures the amount of naphtha insoluble material in the oil. This quantity is reported as the precipitation number.
Precipitation Number by ASTM D91 determines the precipitation number of steam cylinder stocks and black oils, and can be used for other lubricating oils.
Sample quantity required: 200 ml
Contact us today to receive a quote for your lubricants testing.
