Panel compression tests can be affected by the propensity of the thin cross-section to undergo axial buckling. Tests were conducted to measure Young's modulus, proportional stress limit, and compression strength in two edgewise directions using an end-loading compression method and an alternate method developed by the Illinois Institute of Technology Research Institute (IITRI). The IITRI method mitigates the potential for buckling without explicit restraint. Young's moduli obtained by the two methods agreed well. In contrast, the test methods had differences in the measurement of proportional stress limit and compression strength
