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A need exists for the development of national standards for materials for filament winding particularly for solid-propellant rocket casings. A classification system is under development which offers promise of covering glass fiber rovings and yarns, sized or finished, for use as reinforcements for organic resins. This method also offers promise of being adaptable for classifying resins and preimpregnated reinforcements. The selection of key properties for use in evaluating these materials is discussed and a tentative set of properties of reinforcements is proposed for adoption on a national basis. The status of methods of test for determining these properties is discussed. New methods for determining the strength retention after abrasion and the wetting time of uncured reinforcements and for determining the parallel interlaminar shear creep rates in a cured composite are described schematically.
Perry, H. A.
U. S. Naval Ordnance Laboratory, White Oak, Silver Spring, Md.