ASTM B330-02

    Standard Test Method for Fisher Number of Metal Powders and Related Compounds

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    1. Scope

    1.1 This test method uses air permeability to determine an envelope-specific surface area and its associated average equivalent spherical diameter (from 1 to 50 m) of metal powders and related compounds. The powders may be analyzed in their "as-supplied" (shipped, received, or processed) condition or after they have been de-agglomerated or milled by a laboratory procedure ("lab milled") such as that specified in Practice B 859. The values obtained are not intended to be absolute but are generally useful on a relative basis for control purposes.

    1.2 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.


    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

    B243 Terminology of Powder Metallurgy

    B859 Practice for De-Agglomeration of Refractory Metal Powders and Their Compounds Prior to Particle Size Analysis

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E456 Terminology Relating to Quality and Statistics

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    ISO/DIS Document

    ISO/DIS10070 Metallic Powders: Determinations of Envelope-Specific Surface Area from Measurements of the Permeability to Air of a Powder Bed Under Steady-State Flow Conditions


    ICS Code

    ICS Number Code 77.160 (Powder metallurgy)

    UNSPSC Code

    UNSPSC Code 31133700(Powdered metals and metal alloys)


    DOI: 10.1520/B0330-02

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