EN ISO 6245:2002

Foreword
1 Scope
2 Normative references
3 Principle
4 Reagents and materials
5 Apparatus
6 Sampling
7 Sample preparation
8 Procedure
9 Calculation
10 Expression of results
11 Precision
12 Test report
Annex ZA (normative) Normative references to international
         publications with their relevant European
         publications

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