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ASTM D6739-20

Current Revision

Standard Test Method for Silica—pH Value

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1.1 This test method is used to measure the pH of a 5 % mass per volume (m/V) silica/water suspension or mechanical dispersion and is indicative of the relative acidity or alkalinity of the silica.

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.


3.1 The pH level of silica, as measured by this test method, is known to affect the vulcanization of some rubber compounds. Refer to Test Method E70 for a fuller understanding of pH and a more detailed procedure for making pH measurements.

SDO ASTM: ASTM International
Document Number D6739
Publication Date June 1, 2020
Language en - English
Page Count 3
Revision Level 20
Supercedes
Committee D11.20
Publish Date Document Id Type View
June 1, 2020 D6739-20 Revision
July 1, 2011 D6739-11 Revision
Nov. 10, 2001 D6739-01 Revision
Nov. 1, 2015 D6739-11R15 Reaffirmation
Oct. 1, 2006 D6739-01R06 Reaffirmation