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ASTM D 4438 : 2013 : R2018 : EDT 1

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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

Available format(s)

Hardcopy , PDF

Superseded date

28-03-2024

Superseded by

ASTM D 4438 : 2024

Language(s)

English

Published date

04-06-2018

€59.22
Excluding VAT

Committee
D 32
DocumentType
Test Method
Pages
4
ProductNote
ε1NOTE—Keywords revised editorially in May 2018.
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

1.1This 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.

1.2The 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.

1.3This 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.

1.4This 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.

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