ASTM D482
ASH FROM PETROLEUM PRODUCTS.
This test method covers the determination of ash in the range 0.010?% to 0.180?% by mass, from distillate and residual fuels, gas turbine fuels, crude oils, lubricating oils, waxes, and other petroleum products, in which any ash-forming materials present are normally considered to be undesirable impurities or contaminants. The test method is limited to petroleum products which are free from added ash-forming additives, including certain phosphorus compounds