(Equivalent Test Methods: IP 4, ISO 6245, JIS K 2272, and AFNOR M07-045)
EXPLANATION
Ash in a petroleum product can result from oil or water-soluble metallic compounds or from extraneous solids such as dirt and rust. This test method is not valid for petroleum products containing ash forming additives, including certain phosphorus compounds, or lubricating oils containing lead, or used engine crankcase oils. In certain types of samples, for example, distillate oils, all of the ash forming metals may not be quantitatively retained in the ash. In all such cases sulfated ash procedure in Test Method D874 should be used.
TEST SUMMARY
The sample in a suitable vessel is ignited and burned until only ash and carbon remain. This carbonaceous residue is further converted to ash by heating in a muffle furnace at 775° C, cooled and weighed.
TEST PRECISION
