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ASTM D6556-21

Current Revision

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

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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.


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4.2 CTAB Surface Area (formerly Test Method D3765) has been withdrawn.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

SDO ASTM: ASTM International
Document Number D6556
Publication Date May 1, 2021
Language en - English
Page Count 6
Revision Level 21
Supercedes
Committee D24.21
Publish Date Document Id Type View
May 1, 2021 D6556-21 Revision
Dec. 15, 2019 D6556-19A Revision
Jan. 1, 2019 D6556-19 Revision
Oct. 1, 2017 D6556-17 Revision
Jan. 1, 2016 D6556-16 Revision
June 1, 2014 D6556-14 Revision
Aug. 1, 2010 D6556-10 Revision
Feb. 15, 2009 D6556-09 Revision
Oct. 1, 2007 D6556-07 Revision
Nov. 1, 2004 D6556-04 Revision
July 10, 2003 D6556-03 Revision
Nov. 10, 2002 D6556-02A Revision
June 10, 2002 D6556-02 Revision
Dec. 10, 2001 D6556-01A Revision
Dec. 10, 2001 D6556-01 Revision
Dec. 10, 2001 D6556-00A Revision