ASTM D6845-12
Standard Test Method for Silica, Precipitated, Hydrated—CTAB (Cetyltrimethylammonium Bromide) Surface Area

Standard No.

ASTM D6845-12

Release Date

2012

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D6845-18

Latest

ASTM D6845-22

Scope

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.

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 and health practices and determine the applicability of regulatory limitations prior to use.

ASTM D6845-12 Referenced Document

• ASTM D1193 Standard Specification for Reagent Water
• ASTM D1799 Standard Practice for Carbon Black-Sampling Packaged Shipments
• ASTM D1900 Standard Practice for Carbon Black8212;Sampling Bulk Shipments
• ASTM D4483 Standard Practice for Determining Precision for Test Method Standards in the Rubber and Carbon Black Industries
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM D6845-12 history

• 2022 ASTM D6845-22 Standard Test Method for Silica, Precipitated, Hydrated—CTAB (Cetyltrimethylammonium Bromide) Surface Area
• 2020 ASTM D6845-20 Standard Test Method for Silica, Precipitated, Hydrated—CTAB (Cetyltrimethylammonium Bromide) Surface Area
• 2018 ASTM D6845-18 Standard Test Method for Silica, Precipitated, Hydrated—CTAB (Cetyltrimethylammonium Bromide) Surface Area
• 2012 ASTM D6845-12 Standard Test Method for Silica, Precipitated, Hydrated—CTAB (Cetyltrimethylammonium Bromide) Surface Area
• 2002 ASTM D6845-02(2008) Standard Test Method for Silica, Precipitated, Hydratedx2014;CTAB (Cetyltrimethylammonium Bromide) Surface Area
• 2002 ASTM D6845-02 Standard Test Method for Silica, Precipitated, Hydrated8212;CTAB (Cetyltrimethylammonium Bromide) Surface Area