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compressive strength of gypsum wallboard

201539ensp enspCompressive Strength typical Ultimate compressive strength at 70oF 21oC and 50 Relative Humidity RH Determinations were made from 2 x 2 50 x 50 mm or 4 x 4 100 x 100 mm samples cut from across the full board width excluding taper Samples were conditioned for a minimum of 24 hours and tested in compressive strength machines