This European Standard describes a method for the determination of the ash, (in the range 0. 01 to 0. 20% (m/m) from distillate and residual fuel oils, 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 (Note 1). The method is limited to petroleum products which are free from added ash-forming additives, including certain phosphorus compounds (Note 2).
NOTE 1. With certain types of sample the test result may not account quantitatively for all the metal compounds capable of forming an ash.. This is particularly true in the case of distillate oils for which it is necessary to use a special procedure if it is desired to determine the metal compounds.
NOTE 2. This method is not intended for the analysis of unused lubricating oils containing additives; for such samples use a corresponding national standard based on CEN 19/U11-1971 -Test for sulphated ash from lubricating oils and additives; neither is it intended for the analysis of lubricating oils containing lead nor for used engine crankcase oils.
DS/EN 7:1976 history
1976DS/EN 7:1976 Determination of ash from petroleum products