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ASTM D4438-24

Current Revision

Standard Test Method for Particle Size Distribution of Catalysts and Catalyst Carriers by Electronic Counting

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1.1 This test method covers the determination of particle size distribution of catalyst and catalyst carrier (see Terminology D3766) particles using an electroconductive sensing method and is one of several valuable methods for the measurement of particle size.

1.2 The range of particle sizes investigated was 20 μm to 150 μm (see IEEE/ASTM SI 10) equivalent spherical diameter. The technique is capable of measuring particles above and below this range. The instrument used for this method is an electric current path of small dimensions that is modulated by individual particle passage through an aperture, and produces individual pulses of amplitude proportional to the particle volume.

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.


4.1 This test method can be used to determine particle size distributions for material specifications, manufacturing control, and research and development work in the particle size range usually encountered in fluidizable cracking catalysts.

SDO ASTM: ASTM International
Document Number D4438
Publication Date March 15, 2024
Language en - English
Page Count 4
Revision Level 24
Supercedes
Committee D32.02
Publish Date Document Id Type View
March 15, 2024 D4438-24 Revision
Dec. 1, 2013 D4438-13 Revision
May 1, 2018 D4438-13R18E01 Reaffirmation
April 1, 2007 D4438-85R07 Reaffirmation
March 18, 1985 D4438-85R01E01 Reaffirmation
March 18, 1985 D4438-85R97 Reaffirmation