ASTM D8016 - 18e1

    Standard Test Method for Silica, Precipitated, Hydrated—Sears Number

    Active Standard ASTM D8016 | Developed by Subcommittee: D11.20

    Book of Standards Volume: 09.01


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    Significance and Use

    4.1 The rubber-filler interaction needed in silica technology for the rubber industry is based on the use of silane-coupling agents that react with the silanol groups on the surface of the silica during the processing step called silanization. Silane-coupling agents are multifunctional molecules able to create molecular bridges between the elastomer or rubber matrix and the silica surface.

    1. Scope

    1.1 This test method is used to determine the number of silanol groups on the surface of silica by titration according to a method as developed by Sears. This test method is suitable for characterizing rubber-grade silicas.

    1.2 Units—The values stated in SI units are to be regarded as the 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.


    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

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

    D6738 Test Method for Precipitated SilicaVolatile Content


    ICS Code

    ICS Number Code 83.040.20 (Rubber compounding ingredients)

    UNSPSC Code

    UNSPSC Code 12352309(Silica)


    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D8016-18E01

    Citation Format

    ASTM D8016-18e1, Standard Test Method for Silica, Precipitated, Hydrated—Sears Number, ASTM International, West Conshohocken, PA, 2018, www.astm.org

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