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ASTM D2068-08

Historical Revision

Standard Test Method for Determining Filter Blocking Tendency

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1.1 This test method covers three procedures for the determination of the filter blocking tendency (FBT) and filterability of middle distillate fuel oils and liquid fuels such as biodiesel and biodiesel blends. The 3 procedures and associated filter types, are applicable to fuels within the viscosity range of 1.3 to 6.0 mm2/s at 40C.

Note 1

ASTM specification fuels falling within the scope of this test method are: Specifications D 396 Grades No 1 and 2; Specification D 975 Grades 1-D, low sulfur 1-D and 2-D; Specification D 2880 Grades 1-GT and 2-GT; Specification D 6751.

1.2 This test method is not applicable to fuels that contain free (undissolved) water (see ).

1.3 The values stated in SI Units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


This test method is intended for use in evaluating distillate fuel cleanliness in those applications that demand a high throughput per installed filter.

A change in filtration performance after storage or pretreatment can be indicative of changes in fuel condition.

Causes of poor filterability might include fuel degradation products, contaminants picked up during storage or transfer, or interaction of the fuel with the filter media. Any of these could correlate with orifice or filter system plugging, or both.

SDO ASTM: ASTM International
Document Number D2068
Publication Date July 1, 2008
Language en - English
Page Count 9
Revision Level 08
Supercedes
Committee D02.14
Publish Date Document Id Type View
May 1, 2024 D2068-24 Revision
Oct. 1, 2020 D2068-20 Revision
May 1, 2017 D2068-17 Revision
June 1, 2014 D2068-14 Revision
July 1, 2013 D2068-13 Revision
Dec. 1, 2012 D2068-12A Revision
June 1, 2012 D2068-12 Revision
Oct. 1, 2010 D2068-10 Revision
July 1, 2008 D2068-08 Revision
Nov. 1, 2004 D2068-04 Revision
Jan. 1, 1991 D2068-97 Revision
June 10, 2003 D2068-97R03 Reaffirmation