ASTM D6739 - 11

    Standard Test Method for Silica - pH Value

    Active Standard ASTM D6739 | Developed by Subcommittee: D11.20

    Book of Standards Volume: 09.01


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    Significance and Use

    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.

    1. Scope

    1.1 This test method is used to measure the pH of a 5 % 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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E70 Test Method for pH of Aqueous Solutions With the Glass Electrode

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    ICS Code

    ICS Number Code 71.100.55 (Silicones)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D6739-11

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