Moisture ingression was studied in several composite sandwich panels. No observable ingression was found in a panel with HRP core of density 0.13 g/cm3 (8.0 lb/ft3). Significant moisture ingression occurred in a panel with Korex 3.0-lb core with density 0.048 g/cm3, (3.0 lb/ft3). It was faster in the Y-axis (core ribbon) direction, per unit distance than in other directions
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