ASTM D2068 - 14

    Standard Test Method for Determining Filter Blocking Tendency

    Active Standard ASTM D2068 | Developed by Subcommittee: D02.14

    Book of Standards Volume: 05.01


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    Significance and Use

    5.1 This test method is intended for use in evaluating the cleanliness of middle distillate fuels, and biodiesel and biodiesel blends for specifications and quality control purposes.

    5.2 The filter media specified in the three procedures are all suitable for the materials in the Scope. Specifications calling up this test method should state the procedure required.

    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 and therefore results from this test method might not correlate with full scale filtration.

    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 bio fuels, 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 FBT test can range from 1 with a fuel with very good filterability, to over 100 for a fuel with poor filterability. The selection of a single FBT number to define a pass or fail criteria is not possible as this will be dependent on the fuel type and applications.

    1. Scope

    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 40°C.

    Note 1: ASTM specification fuels falling within the scope of this test method are: Specifications D396 Grades No 1 and 2; Specification D975 Grades 1-D, low sulfur 1-D and 2-D; Specification D2880 Grades 1-GT and 2-GT; Specification D6751.

    1.2 This test method is not applicable to fuels that contain free (undissolved) water (see 7.3).

    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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D396 Specification for Fuel Oils

    D975 Specification for Diesel Fuel Oils

    D2880 Specification for Gas Turbine Fuel Oils

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    D4176 Test Method for Free Water and Particulate Contamination in Distillate Fuels (Visual Inspection Procedures)

    D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products

    D4860 Test Method for Free Water and Particulate Contamination in Middle Distillate Fuels (Clear and Bright Numerical Rating)

    D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants

    D6426 Test Method for Determining Filterability of Middle Distillate Fuel Oils

    D6708 Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material

    D6751 Specification for Biodiesel Fuel Blend Stock (B100) for Middle Distillate Fuels

    ISO Standard

    ISO5636-5 Paper and Board--Determination of Air Permeance and Air Resistance (Medium Range) Part 5 Gurley Method


    ICS Code

    ICS Number Code 75.160.20 (Liquid fuels)

    UNSPSC Code

    UNSPSC Code 15101700(Fuel Oils)


    Referencing This Standard

    DOI: 10.1520/D2068-14

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D2068-14, Standard Test Method for Determining Filter Blocking Tendency, ASTM International, West Conshohocken, PA, 2014, www.astm.org

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