ASTM B922-22
Standard Test Method for Metal Powder Specific Surface Area by Physical Adsorption

Standard No.

ASTM B922-22

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM B922-22

Scope

1.1 This test method covers determination of surface area of metal powders. The test method specifies general procedures that are applicable to many commercial physical adsorption instruments. The method provides specific sample outgassing procedures for listed materials. It includes additional general outgassing instructions for other metals. The multipoint equation of Brunauer, Emmett, and Teller (BET),2 along with the single point approximation of the BET equation, forms the basis for all calculations. 1.2 This test method does not include all existing procedures appropriate for outgassing metallic materials. The procedures included provided acceptable results for samples analyzed during interlaboratory testing. The investigator shall determine the appropriateness of listed procedures. 1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 State all numerical values in terms of SI units, unless specific instrumentation software reports surface area using alternate units. In this case, present both reported and equivalent SI units in the final written report. Many instruments report surface area as m2 /g, instead of using correct SI units (m2 /kg). 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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.

ASTM B922-22 Referenced Document

• ASTM B215 Standard Practices for Sampling Finished Lots of Metal Powders
• ASTM B243 Standard Terminology of Powder Metallurgy*， 2023-05-01 Update
• 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 B922-22 history

• 2022 ASTM B922-22 Standard Test Method for Metal Powder Specific Surface Area by Physical Adsorption
• 2020 ASTM B922-20 Standard Test Method for Metal Powder Specific Surface Area by Physical Adsorption
• 2017 ASTM B922-17 Standard Test Method for Metal Powder Specific Surface Area by Physical Adsorption
• 2010 ASTM B922-10 Standard Test Method for Metal Powder Specific Surface Area by Physical Adsorption
• 2002 ASTM B922-02 Standard Test Method for Metal Powder Specific Surface Area by Physical Adsorption