1. Scope

1.1 This test method covers a procedure which is used to measure the surface area of precipitated hydrated silicas by the conventional Brunauer, Emmett, and Teller (BET) theory of multilayer gas adsorption behavior using multipoint determinations, similar to that used for carbon black in Test Methods D4820. This test method specifies the sample preparation and treatment, instrument calibrations, required accuracy and precision of experimental data, and calculations of the surface area results from the obtained data.

1.2 This test method is used to determine the nitrogen surface area of precipitated silicas with specific surface areas in the range of 1 to 50 hm /kg (10 to 500 m2/g).

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 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.> The minimum safety equipment should include protective gloves, sturdy eye and face protection, and means to deal safely with accidental mercury spills.

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 Black--Sampling Packaged Shipments

D1900 Practice for Carbon Black--Sampling Bulk Shipments

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

D4820 Test Methods for Carbon Black--Surface Area by Multipoint B.E.T. Nitrogen Adsorption

Keywords

nitrogen adsorption surface area; precipitated hydrated silica; silicas; surface area; BET (Brunauer, Emmett, and Teller) surface area; Gas adsorption; Hydrated silica; Nitrogen adsorption surface area; Precipitated hydrated silica; Silica; Surface analysis--rubber chemicals/materials;

ICS Code

ICS Number Code 71.060.20 (Oxides)

DOI: 10.1520/D1993-91R97

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