ASTM C958-92(2022)

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.
Designation: C958 − 92 (Reapproved 2022)
Standard Test Method for
Particle Size Distribution of Alumina or Quartz by X-Ray
Monitoring of Gravity Sedimentation
This standard is issued under the fixed designation C958; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Determine the Precision of a Test Method
1.1 This test method covers the determination of the particle
3. Terminology
size distribution of alumina or quartz powders in the range
from 0.5 µm to 50 µm and having a median particle diameter 3.1 For definitions of terms used in this test method, refer to
Terminology C242.
from 2.5 µm to 10 µm using a sedimentation method. This test
method is one of several found valuable for the measurement
4. Summary of Test Method
of particle size. Instruments used for this test method employ a
constant intensity X-ray beam that is passed through a sedi-
4.1 An aqueous homogeneous dispersion of the specimen is
menting dispersion of particles.
permitted to settle in a cell. The decrease in particle concen-
tration over a programmed settling distance is monitored by an
1.2 The values stated in SI units are to be regarded as the
X-ray beam passing through the sedimenting dispersion to a
standard. The values given in parentheses are for information
detector. The specimen concentration at any given sedimenta-
only.
tion distance is inversely proportional to the X-ray flux and the
1.3 This standard does not purport to address all of the
equivalent diameter (spherical) is calculated from Stokes’ law.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- NOTE 1—Refer to Terminology C242. Most equipment manufacturers
refer to this as the equivalent spherical diameter.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Apparatus
For specific hazard statements, see Section 7.
1.4 This international standard was developed in accor- 5.1 X-Ray Sedimentation Apparatus.
dance with internationally recognized principles on standard-
5.2 Ultrasonic Probe or Bath—Anultrasonicprobeapproxi-
ization established in the Decision on Principles for the
mately13 mm( ⁄2-in.)indiameterandapproximately50to100
Development of International Standards, Guides and Recom- 2
W or an ultrasonic bath of approximately 0.3 W/cm (2
mendations issued by the World Trade Organization Technical
W/in. ).
Barriers to Trade (TBT) Committee.
6. Reagents
2. Referenced Documents
6.1 Purity of Reagents—Reagent grade chemicals shall be
2.1 ASTM Standards:
used in all tests. Unless otherwise indicated, it is intended that
C242 Terminology of Ceramic Whitewares and Related
all reagents shall conform to the specifications of the Commit-
Products
tee onAnalytical Reagents of theAmerican Chemical Society,
E177 Practice for Use of the Terms Precision and Bias in
where such specifications are available. Other grades may be
ASTM Test Methods
used, provided it is first ascertained that the reagent is of
E691 Practice for Conducting an Interlaboratory Study to
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
ThistestmethodisunderthejurisdictionofASTMCommitteeC21onCeramic
6.2 Distilled or Deionized Water.
Whitewares and Related Productsand is the direct responsibility of Subcommittee
C21.04 on Raw Materials.
Current edition approved May 1, 2022. Published May 2022. Originally
approved in 1992. Last previous edition approved in 2014 as C958–92 (2014). DOI: ACS Reagent Chemicals, Specifications and Procedures for Reagents and
10.1520/C0958-92R22. Standard-Grade Reference Materials, American Chemical Society, Washington,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or DC. For suggestions on the testing of reagents not listed by theAmerican Chemical
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset,
Standards volume information, refer to the standard’s Document Summary page on U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharma-
the ASTM website. copeial Convention, Inc. (USPC), Rockville, MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C958 − 92 (2022)
6.3 Dispersing Liquid—Dissolve 1.0 g/L of reagent grade 8.6 Fill the cell with the dispersed slurry according to the
sodium hexametaphosphate in distilled or deionized water. manufacturer’s instructions, making sure that no air bubbles
Discard any remaining solution after six weeks from date of remain in the cell.
preparation.
8.7 Run the particle size distribution in
...