ASTM D6791 - 11

    Standard Test Method for Determination of Grain Stability of Calcined Petroleum Coke

    Active Standard ASTM D6791 | Developed by Subcommittee: D02.05

    Book of Standards Volume: 05.03


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    Significance and Use

    The grain stability of calcined petroleum coke determines the resistance to breakdown of +4 mm particles used in the manufacture of carbon anodes for use in the reduction process of aluminum.

    Calcined petroleum cokes have to be relatively easy to grind for fines production but strong enough to withstand forming pressures and thermal stresses occurring when the anodes are used in the reduction process.

    1. Scope

    1.1 This test method covers a laboratory vibration mill method for the determination of the grain stability of calcined petroleum coke for the manufacture of carbon products used in the smelting of aluminum. Calcined petroleum coke with poor mechanical strength may become degraded during mixing. Poor grain stability will affect the grain size and may result in poor quality of baked blocks.

    1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.3 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

    D346 Practice for Collection and Preparation of Coke Samples for Laboratory Analysis

    D2013 Practice for Preparing Coal Samples for Analysis

    D2234/D2234M Practice for Collection of a Gross Sample of Coal

    D6969 Practice for Preparation of Calcined Petroleum Coke Samples for Analysis

    D6970 Practice for Collection of Calcined Petroleum Coke Samples for Analysis

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

    ISO Standard

    ISO6375 Carbonaceous Materials for the Production of AluminumCoke for ElectrodesSampling


    ICS Code

    ICS Number Code 75.080 (Petroleum products in general)

    UNSPSC Code

    UNSPSC Code 15101604(Coke)


    DOI: 10.1520/D6791-11

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