Standard Test Method for Determining Enhanced Filter Blocking Tendency (EFBT)

SIGNIFICANCE AND USE
5.1 This test method is intended for use in evaluating the cleanliness of middle distillate fuels for quality control purposes.  
5.2 The filter media specified in this procedure is suitable for the materials in the scope.  
5.3 A change in filtration performance after storage or pretreatment can be indicative of changes of fuel condition.  
5.4 The filterability of fuels varies depending on filter porosity and structure. Therefore, results from this test method might not correlate with full-scale filtration; however, results from this test might help identify fuels that can reduce filter life.  
5.5 Causes of poor filterability in industrial/refinery filters include fuel degradation products, contaminants (including water) picked up during storage or transfer, effects due to temperature or composition for diesel, incompatibility of commingled fuels, or interaction of the fuel with the filter media. Any of these could correlate with orifice or filter system plugging, or both.  
5.6 The results of the EFBT test can range from 1 for a fuel with very good filterability, to over 30 for a fuel with poor filterability. The selection of a single EFBT number to define a pass or fail criteria is not possible, as this will be dependent on the fuel type and application specifics. The correlation between filter life and EFBT number is, therefore, dependent on many variables stemming from the design and use of the engine. Some factors like pressures and particle size removal required come from the fuel system design while others are a result of the duty cycle and environment where the engine is deployed. As an example, a large displacement HPCR (High-Pressure Common Rail) engine in continuous operation may have cleanliness needs much greater than that of a medium or light-duty engine in occasional use. In each case, the expected EFBT value may be different. An EFBT value of D2068 method (Appendix X1).
SCOPE
1.1 This test method covers a procedure for the determination of the Enhanced Filter Blocking Tendency (EFBT) and the filterability of middle distillate fuel oils. This test is applicable to fuels within the viscosity range of 1.3 mm2/s to 6.0 mm2/s at 40 °C.
Note 1: ASTM specification fuels falling within the scope of this test method are: Specification D396 Grades No 1 and 2; Specification D975 Grades No. 1-D S15 and S500, and No. 2-D S15 and S500; Specification D2880 Grades No. 1-GT and No. 2-GT.  
1.2 This test method has interim repeatability only. For more information, see Section 12.  
1.3 This test method is not applicable to fuels that contain free (undissolved) water (see 7.3).  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM D8386-21 - Standard Test Method for Determining Enhanced Filter Blocking Tendency (EFBT)
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D8386 − 21
Standard Test Method for
1
Determining Enhanced Filter Blocking Tendency (EFBT)
This standard is issued under the fixed designation D8386; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method is based on Test Method D2068 and uses a filter media which is more sensitive
to blocking by contaminants in fuels than the filter specified in Test Method D2068 ProcedureAand
B.Theresultofthistestmethodisdependentonthemandatedfiltermaterial,aswellastheprocedural
steps of this method. If a specification requires a specific Dxxxx procedure, do not substitute a
different procedure or filter without agreement from the specifier.
1. Scope 2. Referenced Documents
2
1.1 This test method covers a procedure for the determina-
2.1 ASTM Standards:
tionoftheEnhancedFilterBlockingTendency(EFBT)andthe
D396 Specification for Fuel Oils
filterability of middle distillate fuel oils. This test is applicable
D975 Specification for Diesel Fuel
2 2
tofuelswithintheviscosityrangeof1.3 mm /sto6.0 mm /sat
D2068 Test Method for Determining Filter Blocking Ten-
40 °C.
dency
D2880 Specification for Gas Turbine Fuel Oils
NOTE 1—ASTM specification fuels falling within the scope of this test
method are: Specification D396 Grades No 1 and 2; Specification D975
D4057 Practice for Manual Sampling of Petroleum and
Grades No. 1-D S15 and S500, and No. 2-D S15 and S500; Specification
Petroleum Products
D2880 Grades No. 1-GT and No. 2-GT.
D4175 Terminology Relating to Petroleum Products, Liquid
1.2 This test method has interim repeatability only. For
Fuels, and Lubricants
more information, see Section 12.
D4176 Test Method for FreeWater and Particulate Contami-
nation in Distillate Fuels (Visual Inspection Procedures)
1.3 This test method is not applicable to fuels that contain
D4177 Practice for Automatic Sampling of Petroleum and
free (undissolved) water (see 7.3).
Petroleum Products
1.4 The values stated in SI units are to be regarded as
D4860 Test Method for FreeWater and Particulate Contami-
standard. No other units of measurement are included in this
nation in Middle Distillate Fuels (Clear and Bright Nu-
standard.
merical Rating)
1.5 This standard does not purport to address all of the
D6300 Practice for Determination of Precision and Bias
safety concerns, if any, associated with its use. It is the
Data for Use in Test Methods for Petroleum Products,
responsibility of the user of this standard to establish appro-
Liquid Fuels, and Lubricants
priate safety, health, and environmental practices and deter-
3
2.2 ASTM Manuals:
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor- ASTM MNL 1
dance with internationally recognized principles on standard-
2.3 ASTM Adjuncts:
ization established in the Decision on Principles for the
D2PP, Determination of Precision and Bias Data for Use in
Development of International Standards, Guides and Recom-
4
Test Methods for Petroleum Products
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1
This test method is under the jurisdiction of ASTM Committee D02 on Standards volume information, refer to the standard’s Document Summary page on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of the ASTM website.
3
Subcommittee D02.14 on Stability, Cleanliness and Compatibility of Liquid Fuels. MNL 1, Manual on Significance of Tests for Petroleum Products, 9th Edition,
Current edition approved April 1, 2021. Published May 2021. DOI: 10.1520/ ASTM International, West Conshohocken, 2018.
4
D8386-21. This adjunct has been withdrawn and is no longer available.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D8386 − 21
3. Terminology pass or fail criteria is not possible, as this will be dependent on
thefueltypeandapplicationspecifics.Thecorrelationbetween
3.1 For definitions of terms used in this standard, see
filter life and EFBT number is, therefore, dependent on many
Terminology D4175.
variables stemming from the design and use of the engine.
3.2 Definitions of Terms Specific to This Standard:
Some factors like pressures and
...

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