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ASTM D4438-85(1997)
Standard Test Method for Particle Size Distribution of Catalytic Material by Electronic Counting
STANDARD published on 18.3.1985
The information about the standard:
Designation standards: ASTM D4438-85(1997)
Note: WITHDRAWN
Publication date standards: 18.3.1985
SKU: NS-27211
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: American technical standard
Category: Technical standards ASTM
Annotation of standard text ASTM D4438-85(1997) :
Keywords:
catalysts, electroconductive sensing, particle size
Additional information
| 1. Scope | ||||||||
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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 and health practices and determine the applicability of regulatory limitations prior to use. |
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| 2. Referenced Documents | ||||||||
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