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    ASTM D6556 - 21

    Standard Test Method for Carbon Black—Total and External Surface Area by Nitrogen Adsorption

    Active Standard ASTM D6556 | Developed by Subcommittee: D24.21

    Book of Standards Volume: 09.01

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    Significance and Use

    4.1 This test method is used to measure the total and external surface area of carbon blacks based on multipoint nitrogen adsorption. The NSA measurement is based on the B.E.T. theory and it includes the total surface area, inclusive of micropores, pore diameters less than 2 nm (20 Å). The external surface area, based on the statistical thickness method (STSA), is defined as the specific surface area that is accessible to rubber.

    4.2 CTAB Surface Area (formerly Test Method D3765) has been withdrawn. The CTAB value may be estimated from the STSA value using Eq 1. The equation is based on a linear regression of the STSA and CTAB measured values of the SRB 5 standards.

    Equation D6556-21_1

    1. Scope

    1.1 This test method covers the determination of the total surface area by the Brunauer, Emmett, and Teller (B.E.T. NSA) theory of multilayer gas adsorption behavior using multipoint determinations and the external surface area based on the statistical thickness surface area method.

    1.2 The values stated in SI units are to be regarded as the standard. The values given 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. (The minimum safety equipment should include protective gloves, sturdy eye and face protection).

    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

    D1799 Practice for Carbon BlackSampling Packaged Shipments

    D1900 Practice for Carbon BlackSampling Bulk Shipments

    D3765 Test Method for Carbon Black--CTAB (Cetyltrimethylammonium Bromide) Surface Area

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

    ICS Code

    ICS Number Code 71.060.10 (Chemical elements)

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

    DOI: 10.1520/D6556-21

    Citation Format

    ASTM D6556-21, Standard Test Method for Carbon Black—Total and External Surface Area by Nitrogen Adsorption, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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