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    Settled Density of Wood Fiber (Cellulose Based) Loose-Fill Thermal Insulation Using the CS-204 Method

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    An evaluation has been made of the Custom Scientific Instruments Model CS-204 density method in comparison with the ASTM Test for Density of Fibrous Loose Fill Building Insulations (C 519-65), and the 28-day, drop-box, humidity-cycling method in Federal Specification “Insulation Thermal (Loose Fill for Pneumatic or Poured Application): Cellulosic or Wood Fiber” (HH-I-515d).

    The evaluation was done on cellulosic materials where the installed density was measured on material removed from structures previously insulated for more than a two-year period, and on newly manufactured materials.

    Reproducibility of CS-204 as a laboratory method was verified by a series of interlaboratory “round robins.” CS-204 has been found to be an accurate, rapid method for determining settled density of wood fiber (cellulosic based) loose-fill insulation.

    The report discusses the research process, results, and application of the final method to the cellulosic loose-fill insulation industry.

    This presentation is a synopsis of a two-year study on a settled-density test method for loose-fill wood fiber (cellulosic based) thermal insulation. The detailed work this paper is based upon is available at present from the author.


    density measurement, settling, cellulose, wood fiber, thermal insulation, heat transmission, thermal resistance, thickness, volume, weight, area

    Author Information:

    Derbyshire, B
    Technical service manager, Thermtron Products, Inc., Fort Wayne, Ind.

    Committee/Subcommittee: C16.23

    DOI: 10.1520/STP29264S