IP 387: Determination of filter blocking tendency

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  • Method adopted/last revised:
  • Method reapproved: 2022
  • Status: Current
  • First printed in STM books: 2017

This standard specifies a method for the determination of the filter blocking tendency (FBT) and filterability of middle distillate fuel oils and non-petroleum liquid fuels such as biodiesel, where the end use demands an exceptional degree of cleanliness. The method covers 3 procedures and associated filter types, and is applicable to fuels within the viscosity range of 1,5 mm2/s to 6,0 mm2/s at 40 °C.

A change in filtration performance after storage or pre-treatment, such as cold soaking, can be used to indicate potential filter blocking problems or small changes in fuel condition.

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