ASTM C421 - 08

    Standard Test Method for Tumbling Friability of Preformed Block-Type and Preformed Pipe-Covering-Type Thermal Insulation

    Active Standard ASTM C421 | Developed by Subcommittee: C16.32

    Book of Standards Volume: 04.06


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    ASTM C421

    Significance and Use

    Several test methods for measuring mass loss by abrasion and impact of preformed block-type and preformed pipe-covering-type thermal insulation have been used previously. It is believed that no single test method completely covers all factors involving such forces for different kinds of materials, but this test method is intended to provide a procedure that gives reproducible results. It is used for comparing the mass loss by tumbling before and after a specific treatment of the insulation, as agreed upon by the purchaser and the manufacturer.

    1. Scope

    1.1 This test method covers determination of the mass loss of preformed block-type and preformed pipe-covering-type thermal insulation as a result of a combination of abrasion and impact produced by a laboratory tumbling mechanism.

    1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are provided for information only.

    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

    C168 Terminology Relating to Thermal Insulation

    C302 Test Method for Density and Dimensions of Preformed Pipe-Covering-Type Thermal Insulation

    C303 Test Method for Dimensions and Density of Preformed Block and Board-Type Thermal Insulation


    ICS Code

    ICS Number Code 27.220 (Heat recovery. Thermal insulation)

    UNSPSC Code

    UNSPSC Code 30141500(Thermal insulation)


    DOI: 10.1520/C0421-08

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