ASTM C837-09(2019)
(Test Method)Standard Test Method for Methylene Blue Index of Clay
Standard Test Method for Methylene Blue Index of Clay
SIGNIFICANCE AND USE
3.1 Tests run on many clays generally indicate that a straight-line relationship exists between the methylene blue index (MBI) and such fundamental clay properties as cation exchange capacity, dry bond strength, and casting rate. Where the colloidal portion of the clay is kaolinite, there is also a direct correlation with specific surface (as determined by nitrogen adsorption). Where the colloidal portion contains significant amounts of illite or montmorillonite, the same close correlation does not exist. The MBI better correlates with the ceramic-forming properties than does the specific surface.
3.2 That portion of a clay lying within the colloidal range (generally defined as the 0.5- to 0.001-μm range), determines the strictly colloidal properties of the clay and, together with the amount and type of organic material associated with the clay and the 2- to 0.2-μm fraction, largely determines the properties of the clay when used in ceramic-forming processes. While the specific surface of a clay is a function of the particle size and morphology and a relationship exists between dye adsorption and specific surface, the MBI should not be considered to be a particle size analysis since the value obtained is dominated by the character of only the very fine end of the particle size distribution. This procedure describes the determination of the dye adsorption (in this case, methylene blue) of a clay.
SCOPE
1.1 This test method covers the measurement of the adsorption of methylene blue dye by a clay, which is calculated as a methylene blue index for a clay.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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.
General Information
Relations
Standards Content (Sample)
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: C837 − 09 (Reapproved 2019)
Standard Test Method for
Methylene Blue Index of Clay
This standard is issued under the fixed designation C837; 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* correlation does not exist. The MBI better correlates with the
ceramic-forming properties than does the specific surface.
1.1 This test method covers the measurement of the adsorp-
tion of methylene blue dye by a clay, which is calculated as a 3.2 That portion of a clay lying within the colloidal range
methylene blue index for a clay. (generally defined as the 0.5- to 0.001-µm range), determines
the strictly colloidal properties of the clay and, together with
1.2 The values stated in SI units are to be regarded as
the amount and type of organic material associated with the
standard. No other units of measurement are included in this
clay and the 2- to 0.2-µm fraction, largely determines the
standard.
properties of the clay when used in ceramic-forming processes.
1.3 This standard does not purport to address all of the
While the specific surface of a clay is a function of the particle
safety concerns, if any, associated with its use. It is the
size and morphology and a relationship exists between dye
responsibility of the user of this standard to establish appro-
adsorption and specific surface, the MBI should not be con-
priate safety, health, and environmental practices and deter-
sidered to be a particle size analysis since the value obtained is
mine the applicability of regulatory limitations prior to use.
dominated by the character of only the very fine end of the
1.4 This international standard was developed in accor-
particle size distribution. This procedure describes the deter-
dance with internationally recognized principles on standard-
minationofthedyeadsorption(inthiscase,methyleneblue)of
ization established in the Decision on Principles for the
a clay.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Apparatus
Barriers to Trade (TBT) Committee.
4.1 Balance, accurate to 0.01 g.
2. Referenced Documents 4.2 Mixer.
2.1 ASTM Standards: 4.3 pH Meter or pH Paper.
C324 Test Method for Free Moisture in Ceramic Whiteware
4.4 Beaker, 600 mL.
Clays
4.5 Buret, 25 mL.
3. Significance and Use
4.6 Medicine Dropper or Glass Stirring Rod.
3.1 Tests run on many clays generally indicate that a
4.7 Filter Paper. Baroid No. 987.
straight-line relationship exists between the methylene blue
index (MBI) and such fundamental clay properties as cation 5. Reagents
exchange capacity, dry bond strength, and casting rate. Where
5.1 Purity of Reagents—Reagent grade chemicals shall be
the colloidal portion of the clay is kaolinite, there is also a
used in all tests. Unless otherwise indicated, it is intended that
direct correlation with specific surface (as determined by
all reagents shall conform to the specifications of the Commit-
nitrogen adsorption). Where the colloidal portion contains
tee onAnalytical Reagents of theAmerican Chemical Society,
significant amounts of illite or montmorillonite, the same close 3
where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
ThistestmethodisunderthejurisdictionofASTMCommitteeC21onCeramic
accuracy of the determination.
Whitewares and Related Productsand is the direct responsibility of Subcommittee
C21.04 on Raw Materials.
Current edition approved Oct. 1, 2019. Published October 2019. Originally
approved in 1976. Last previous edition approved in 2014 as C837 – 09 (2014). Reagent Chemicals, American Chemical Society Specifications, American
DOI: 10.1520/C0837-09R19. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
*A Summary of Changes section appears at the end of this stan
...
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