1.1 This test method covers the determination of particle size distribution of catalyst and catalyst carrier 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 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.
ASTM D4438-13(2018)e1 Referenced Document
ASTM D1193 Standard Specification for Reagent Water
ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
IEEE/ASTM SI 10 American National Standard for Metric Practice
ASTM D4438-13(2018)e1 history
2024ASTM D4438-24 Standard Test Method for Particle Size Distribution of Catalysts and Catalyst Carriers by Electronic Counting
2018ASTM D4438-13(2018)e1 Standard Test Method for Particle Size Distribution of Catalysts and Catalyst Carriers by Electronic Counting
2013ASTM D4438-13 Standard Test Method for Particle Size Distribution of Catalysts and Catalyst Carriers by Electronic Counting
1985ASTM D4438-85(2007) Standard Test Method for Particle Size Distribution of Catalytic Material by Electronic Counting
1985ASTM D4438-85(2001)e1 Standard Test Method for Particle Size Distribution of Catalytic Material by Electronic Counting
1985ASTM D4438-85(1997) Standard Test Method for Particle Size Distribution of Catalytic Material by Electronic Counting