ASTM D2068-08

Standard Test Method for Determining Filter Blocking Tendency

STANDARD published on 1.7.2008

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The information about the standard:

Designation standards: ASTM D2068-08
Note: WITHDRAWN
Publication date standards: 1.7.2008
SKU: NS-19195
The number of pages: 9
Approximate weight : 27 g (0.06 lbs)
Country: American technical standard
Category: Technical standards ASTM

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Annotation of standard text ASTM D2068-08 :

Keywords:

automotive diesel, biodiesel, filterability, filter blocking tendency (FBT), gas oil, marine diesel, middle distillates

Additional information

Significance and 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.

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 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.

2. Referenced Documents

D975-26c	Standard Specification for Diesel Fuel (Includes all amendments and changes 7/20/2026).
D2880-23	Standard Specification for Gas Turbine Fuel Oils
D4057-22	Standard Practice for Manual Sampling of Petroleum and Petroleum Products
D4176-22e1	Standard Test Method for Free Water and Particulate Contamination in Distillate Fuels (Visual Inspection Procedures) (Includes all amendments and changes 6/30/2025).
D4177-22e1	Standard Practice for Automatic Sampling of Petroleum and Petroleum Products (Includes all amendments and changes 3/24/2023).
D6426-22	Standard Test Method for Determining Filterability of Middle Distillate Fuel Oils
	CompTM, Standard Practice for Statistical Assessment and Improvement of the Expected Agreement between Two Test Methods that Purport to Measure the Same Property of a Material
D6708-24	Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
D6751-24	Standard Specification for Biodiesel Fuel Blendstock (B100) for Middle Distillate Fuels
D6300-26	Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products, Liquid Fuels, and Lubricants
ISO 5636-5	Paper and Board--Determination of Air Permeance and Air Resistance (Medium Range) Part 5 Gurley Method
D396-26a	Standard Specification for Fuel Oils (Includes all amendments and changes 4/14/2026).
	D2PP, Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products This adjunct has been withdrawn and is no longer available.
D4860-22	Standard Test Method for Free Water and Particulate Contamination in Middle Distillate Fuels (Clear and Bright Numerical Rating)

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