ASTM-F660 › Historical Revision Information
Standard Practice for Comparing Particle Size in the Use of Alternative Types of Particle Counters
The following bibliographic material is provided to assist you with your purchasing decision:
Scope
1.1 This practice provides a procedure for comparing the sizes of nonspherical particles in a test sample determined with different types of automatic particle counters, which operate on different measuring principles.
1.2 A scale factor is obtained by which, in the examination of a given powder, the size scale of one instrument may be multiplied to agree with the size scale of another.
1.3 The practice considers rigid particles, free of fibers, of the kind used in studies of filtration, such as: commercially available test standards of quartz or alumina, or fly ash, or some powdered chemical reagent, such as iron oxide or calcium sulfate.
1.4 Three kinds of automatic particle counters are considered:
1.4.1 Image analyzers, which view stationary particles under the microscope and, in this practice, measure the longest end-to-end distance of an individual particle.
1.4.2 Optical counters, which measure the area of a shadow cast by a particle as it passes by a window; and
1.4.3 Electrical resistance counters, which measure the volume of a particle as it passes through an orifice in an electrically conductive liquid.
1.5 This practice also considers the use of instruments that provide sedimentation analyses, which is to say provide measures of the particle mass distribution as a function of Stokes diameter. The practice provides a way to convert mass distribution into number distribution so that the meaning of Stokes diameter can be related to the diameter measured by the instruments in 1.4.
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.
Significance and Use
This practice supports test methods designed to evaluate the performance of fluid-filter media, for example, Practice F 796
The factor for converting one kind of diameter scale to another is only valid for the specific test particles studied.
Keywords
particle counters; Strokes diameter; ICS Number Code 19.120 (Particle size analysis. Sieving)
To find similar documents by ASTM Volume:
To find similar documents by classification:
19.120 (Particle size analysis. Sieving Including test sieves and porosimetry)
This document comes with our free Notification Service, good for the life of the document.
This document is available in either Paper or PDF format.
Document Number
ASTM-F660-83(2007)
Revision Level
1983 R07 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
June 1, 2007
Document Type
Practice
Page Count
5 pages
Committee Number
D19.07