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Last Updated: Mar 16, 2026
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ASTM D8659-26
Standard Test Method for Determination of Count per Volume and Size Distribution of Solid Particles in Light and Middle Distillate Fuels by Direct Imaging Analysis
Standard Test Method for Determination of Count per Volume and Size Distribution of Solid Particles in Light and Middle Distillate Fuels by Direct Imaging Analysis
D8659-26
ASTM|D8659-26|en-US
Standard Test Method for Determination of Count per Volume and Size Distribution of Solid Particles in Light and Middle Distillate Fuels by Direct Imaging Analysis
Standard
D8659 Standard Test Method for Determination of Count per Volume and Size Distribution of Solid Particles in Light and Middle Distillate Fuels by Direct Imaging Analysis>
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Significance and Use
5.1 This test method is intended for evaluating the cleanliness of fuels identified in the scope.
5.2 Detection of particles can indicate degradation of the fluid condition. Particles, whether organic or inorganic, can cause fouling of fuel filters and damage pumps, injectors, and pistons. Knowledge of particle count and size can provide vital information. The direct imaging analyzer provides discrete particle images which can be further used for system diagnostic purposes.
Scope
1.1 This test method covers the use of a direct imaging analyzer to count and measure the size of dispersed solid particles per milliliter in light and middle distillate fuels in the size bands of ≥4 μm, ≥6 μm, and ≥14 μm.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.
1.4 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.