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This part of ISO10307 specifies a method for the determination of total sediment in residual fuel oils having a maximum viscosity of 55 mm2/s at 100 oC, and for blends of distillate fuels containing residual components. The maximum total sediment covered by the precision evaluations of this method is 0,50 % (m/m) for residual fuels and 0,40 % (m/m) for distillate fuels containing residual components. Some fuels could exceed the maximum filtration time specified in this method due to factors other than the presence of significant quantities of insoluble organic or inorganic material. For the determination of sediment insoluble in toluene, see ISO3735. NOTE1 The method can also be used for the assessment of total sediment after regimes of fuel pre-treatment designed to accelerate the ageing process (see ISO10307-2). NOTE2 Significant amounts of sediment in a residual fuel oil can cause fouling of facilities for handling and present problems in burner mechanisms. Sediment can accumulate in storage tanks, on filter screens or on burner parts, resulting in obstruction to flow of oil from the tank to the burner.