The dimensionless tensile strength sigma d/alpha of wet granular materials with saturation levels in the plateau region of the pendular state was correlated with the void fraction of the agglomerate. The correlation fitted well with experimental measurements carried out on glass beads of diameter 93 mu m and with literature data, and was an improvement over the traditional Rumpf model. The tensile strength at other saturations could be easily derived from the proposed correlation. The effects of bed height in the tester cell, liquid saturation levels in the agglomerate, chemical additives and non-uniformity of the packing of the powder mass were also investigated.