ASTM D7723 Macro-Dispersion of Fillers in Compounds

This test technique, ASTM D7723, describes how to assess the surface roughness of a freshly cut specimen to determine the macro-dispersion of fillers in a rubber matrix. The approach outlines a procedure for assessing the quality of a product by combining reinforcing fillers like silica and carbon black. Inert fillers like chalk, clay, and other substances are also used.

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    In this ASTM D7723 test method, filler macrodispersion, as a measure of mixing quality, is used to characterize their assimilation into the rubber matrix. This also tests the ability of colored rubbers to mix well. To photograph a broad spectrum of colors, it uses variable exposure.


    In ASTM D7723, the already cut specimen is placed in front of the testing window within two minutes of cutting the specimen. Then, a minimum of three scans of different body parts are done. It is necessary to take a newly cut surface. For the five scans, a new cut is made. Towards the end of the procedure, calculations are carried out.

    Video 01: Determination of rubber properties by stress relaxation test systems

    Specimen size:

    The thickness of the uncut specimen must be at least 5 to 10 mm.


    The following formula is used in ASTM D7723 to determine the dispersion percentage:

    Dispersion % = 100 – 100 URF%/L 

    URF% is the % of total scan of undispersed filler measured in reflection
    L is the filler volume fraction in the compound.


    In this ASTM D7723 test method, filler macrodispersion, as a measure of mixing quality, is used to characterize their assimilation into the rubber matrix.


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