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ASTM D6845-22

Current Revision

Standard Test Method for Silica, Precipitated, Hydrated—CTAB (Cetyltrimethylammonium Bromide) Surface Area

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1.1 This test method covers the measurement of the specific surface area of precipitated silicas exclusive of area contained in micropores too small to admit hexadecyltrimethylammonium bromide (cetyltrimethylammonium bromide, commonly referred to as CTAB) molecules. This test method is suitable for characterizing rubber-grade silicas of all types.

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.

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 The CTAB molecule is relatively large; so it is not adsorbed in micropores or on surface roughness. Thus, the CTAB surface area reflects only the surface of the silica that is available for interaction with rubber molecules.

SDO ASTM: ASTM International
Document Number D6845
Publication Date Nov. 1, 2022
Language en - English
Page Count 4
Revision Level 22
Supercedes
Committee D11.20
Publish Date Document Id Type View
Nov. 1, 2022 D6845-22 Revision
June 1, 2020 D6845-20 Revision
Feb. 1, 2018 D6845-18 Revision
Jan. 1, 2012 D6845-12 Revision
Dec. 10, 2002 D6845-02 Revision
Jan. 15, 2008 D6845-02R08 Reaffirmation