The paper presents the first complete set of test results obtained from quasi- static measurements of the out-of-plane tension, shear and compression properties of novel XCor ™ and K-Cor™ flat sandwich panels. The cured panels were composed of 0.75mm thick quasi-isotropic IM7/8552 skins, separated by 12.7 mm thick Rohacell® foam core containing 0.51 mm diameter carbon fibre pins (Z- Fiber®), arranged in a truss pattern at pin angle of either 22° or 30° to the vertical. To obtain a suitable baseline comparison, the equivalent set of properties was measured for Nomex honeycomb core panels sandwiched by the same composite skins. The novel Z-pinned cores are found to exhibit higher specific stiffness than conventional sandwich cores, but lower
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