ASTM D1512 - 05(2012)

    Standard Test Methods for Carbon Black—pH Value

    Active Standard ASTM D1512 | Developed by Subcommittee: D24.31

    Book of Standards Volume: 09.01


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    Significance and Use

    3.1 The pH level of a carbon black is known to affect the vulcanization of some rubber compounds.

    1. Scope

    1.1 These test methods, Test Method A—Boiling Slurry and Test Method B—Sonic Slurry, are used to indicate the pH of the carbon black surface by measuring the pH of water in contact with the carbon black.

    Note 1The pH of the carbon black is often used in this industry to indicate the relative acidity or alkalinity of carbon black and will be used in the remainder of these test methods to describe this property.
    Note 2Test Method A and Test Method B do not always give the same results.

    1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.

    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

    D1193 Specification for Reagent Water

    D1799 Practice for Carbon Black--Sampling Packaged Shipments

    D1900 Practice for Carbon Black--Sampling Bulk Shipments

    D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries

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


    ICS Code

    ICS Number Code 83.040.20 (Rubber compounding ingredients)

    UNSPSC Code

    UNSPSC Code 12171603(Carbon black)


    DOI: 10.1520/D1512-05R12

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