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ASTM C837-09

Current Revision

Standard Test Method for Methylene Blue Index of Clay

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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 and health practices and determine the applicability of regulatory limitations prior to use.

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.

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.

SDO ASTM: ASTM International
Document Number C837
Publication Date Jan. 1, 2009
Language en - English
Page Count 2
Revision Level 09
Supercedes
Committee C21.04
Publish Date Document Id Type View
Jan. 1, 2009 C0837-09 Revision
Oct. 10, 1999 C0837-99 Revision
Dec. 1, 2024 C0837-09R24 Reaffirmation
Oct. 1, 2019 C0837-09R19 Reaffirmation
Dec. 1, 2014 C0837-09R14 Reaffirmation
Oct. 1, 2003 C0837-99R03 Reaffirmation