Moisture absorption of polyester-E glass composites immersed in liquids and in humid air were investigated. The weights of the composites as a function of exposure time and temperature were measured for three differ ent types of materials. Tests were performed a) with the materials im mersed in distilled water, in saturated salt water, in No. 2 diesel fuel, in jet A fuel, in synthetic aviation lubricant, in gasoline, and b) with the materi als exposed to humid air. The apparent maximum moisture contents and the apparent diffusivities were deduced from the data.
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