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    A Method for Evaluation of the Thermal Aging Stability of Flexible Sheet Insulation


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    A method for evaluating the thermal aging stability of flexible sheet insulation has been developed using the dielectric strength of the insulation as the failure criterion. This test method has been designed for functional and statistical accuracy, simplicity, and economy of time, labor, materials, and equipment. Samples of flexible sheet insulation are aged at elevated temperatures. After periods of aging, the samples are subjected to a dielectric stress in an electrode system which elongates the sheet insulation approximately 1 per cent. The time required for the average dielectric strength to drop to a predetermined level is considered the life of the insulating material. By testing at several temperatures, the life-temperature relationship is established over a temperature range. This relationship is the goal of the test and from it the life at lower temperatures may be predicted. Preliminary experience has shown this test method satisfies the design goals.

    Author Information:

    Plettner, R. M.
    Dow Corning Corp., Midland, Mich.

    Currin, C. G.
    Dow Corning Corp., Midland, Mich.

    Committee/Subcommittee: D09.17

    DOI: 10.1520/STP46788S