A Simplified Determination of Crystallinity of Fluoroplastics and the Prediction of Their Behavior at Cryogenic Temperatures
In connection with its many liquid propellant rocket-engine programs over the last five years, Rocketdyne has had extensive experience in the design and development of components for cryogenic environments. A partial list of components would include propellant gate valves, poppet and swing-type check valves, relief valves, vent valves and pressure regulators in both missile weight and facility equipment planning. An integral and important part of the development of these components has been the selection of non-metallic materials which would perform under the most severe environmental conditions. The determination and evaluation of the standard physical properties of these materials at exogenic temperatures is an important factor in the selection of materials for cryogenic designs. Toward this end, tests have been made with non-metallics at -320°F to obtain some of the basic low-temperature mechanical properties of these materials. In most instances this data was obtained for selected materials with a view toward the application of these materials in a particular design configuration. There usually was not time to broaden the scope of the Investigations beyond a particular design problem to include all of the parameters which would be of interest to designers in general.
KeywordsCryogenic Temperature Relative Crystallinity Rockwell Hardness Vent Valve Geiger Counter
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