Standard
Current
Petroleum products - Determination of ash
<p>This International Standard specifies a method for the determination of the ash content of petroleum products, such</p>
<p>as distillate and residual fuel oils, crude petroleum, lubricating oils, waxes and other petroleum products, in which</p>
<p>any ash-forming constituents present are normally considered to be undesirable impurities or contaminants. Ash</p>
<p>can result from oil-soluble or water-soluble metallic compounds or from extraneous solids such as dirt and rust.</p>
<p>The method is applicable to products having ash contents in the range 0,001 % (<i>m/m</i>) to 0,180 % (<i>m/m</i>), but does</p>
<p>not apply to products which contain ash-forming additives, including certain phosphorus compounds. The analysis</p>
<p>of unused or used lubricating oils containing additives, used engine crankcase oils, lubricating oils containing lead,</p>
<p>or certain non-hydrocarbon diesel fuels, should be determined using ISO 39871), which includes a step to produce</p>
<p>sulfated ash of higher melting point.</p>
<p>NOTE 1 For the purposes of this International Standard, the term "% (<i>m/m</i>)" is used to represent the mass fraction of a</p>
<p>material.</p>
<p>NOTE 2 With certain types of samples, the test results may not account quantitatively for all the metal compounds capable of</p>
<p>forming an ash. Some unused lubricating oils and distillate fuel oils contain metal inorganic additives of low molecular mass</p>
<p>(e.g. sodium, potassium), where the metal oxide may sublime below the temperatures specified in this International Standard.</p>
