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    Permeability of Materials Under High Pressures and at Various Temperatures

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    Reinforced plastics and other materials used in rockets, missiles, and pressure vessels are frequently subjected to high-pressure differentials, perhaps as high as several thousand pounds per square inch. It is often essential that the pressurizing medium, whether it be air, water, or propellant combustion gases, not be permitted to penetrate into or pass through the material. In many cases high temperatures may also be present. A test device was therefore required to establish the serviceability of various materials under such conditions. After considering the theoretical and practical aspects of the problem, a small pressure vessel was designed and fitted with the necessary accessories to provide an apparatus (the Aerojet Permeability Cell) capable of measuring the permeability rates of solid materials under gas pressures up to at least 5000 psi at temperatures up to about 500 F. Various materials including reinforced-plastic laminates have been so tested; and in some cases, suitable sealants have been evaluated to reduce or prevent the flow of gas through the material.

    Author Information:

    Epstein, George
    Aerojet-General Corp., Azusa, Calif.

    Gary, W. W.
    Aerojet-General Corp., Azusa, Calif.

    Committee/Subcommittee: D20.18

    DOI: 10.1520/STP46378S