ASTM WK45589

    Revision of D3849 - 14 Standard Test Method for Carbon Black—Morphological Characterization of Carbon Black Using Electron Microscopy

    (What is a Work Item?)

    Active Standard: D3849 - 14a

    Developed by Subcommittee: D24.81 | Committee D24 | Contact Staff Manager



    WK45589

    1. Rationale

    In the ASTM D 3849 task force it was shown, that a general conversion from STSA into a mean particle size diameter (MPS) might work for ASTM grades only. However, for specialty grades, especially designed and produced for the pigment market the conversion is not applicable. Examples have been shown where the MPS remained constant, but the STSA tremendously changed. Also carbon blacks with a special designed aggregate size distribution (ASD) can create smaller MPS values at comparable STSA data. The current conversion table included in the current D 3849 standard does not include specialty application blacks in an adequate way. Therefore the table should be revised.


    Keywords

    aggregate size; automated image analysis; carbon black; electron microscopy; particle size; statistical thickness surface area;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    04-01-2014

    Technical Contact:
    Dirk Roller

    Item:
    011

    Ballot:
    D24 (14-01)

    Status:
    Negative Votes Need Resolution